Question1: Which of the following descriptions about solving the system OSNR limitation problem are correct?
(Multiple choice)
Question2: PWE3 is a Layer 2 service bearer technology that can simulate the basic behavior and characteristics of which of the following services as realistically as possible in a packet switching network (PSN)?
Question3: U2000 network management supports multiple external interfaces. When connecting with the network management of other manufacturers' equipment, which of the following interfaces can be used?
Question4: Pointer adjustment is related to which of the following?
Question5: Which of the following statements about U2000 licenses is wrong?
Question6: In Huawei's T-SDN network architecture, () realizes centralized control of single-domain networks, and () is responsible for multi-domain cross-vendor management
Question7: Which of the following is the adjustment unit of AU-PTR?
Question8: From the perspective of single board implementation, what are the main types of ESC? (Multiple choice)
Question9: The frame structure of OTUk at each level is the same.
Question10: Arrayed Guided Grating (AWG) multiplexer/demultiplexer has the following advantages: short wavelength spacing, large channels and flat passband. It is suitable for ultra-high-speed, large-capacity DWDM systems.
Question11: In the Windows operating system, the U2000 program's own log files are stored in which of the following directories of the U2000 installation drive?
Question12: The speed of SF64 and SL64 boards are both STM-64. Therefore, the two boards can be interconnected.
Question13: The number of error blocks in each VC4 channel is detected by B3 at the receiving end. At the same time, this information is sent back to the transmitting end by which of the following items? and reported as HP.REI and OHP-FEBBE at the transmitting end.
Question14: () is called optical transmission segment in Chinese, and (OMS) is called optical multiplexing segment in Chinese.
Question15: When configuring LMSP, there are two switching modes: single-ended switching and dual-ended switching. Single-ended switching does not require the protection protocol to be enabled.
Question16: In a 3-7-3 multiplexing line, one VC-12 can transmit () 2.048 Mbit/s signal.
Question17: Which of the following are the main features of the overall structure of a WDM system with N- channel wavelength multiplexing? (Multiple choice)
Question18: When LCK is inserted into the local ODUk signal, which processing will the downstream station system not perform?
Question19: Which of the following descriptions of MPLS are wrong? (Multiple choice)
Question20: When using scripts to back up and restore the network configuration data of the U2000, you can change the directory where the exported files are saved.
Question21: A communication network is a system that interconnects geographically dispersed user terminal devices to achieve communication and information exchange. It is mainly composed of user equipment and transmission equipment.
Question22: The current sparse wavelength division multiplexing system generally operates in the band from
1271nm to 1611nm. Which of the following is the channel spacing?
Question23: Which of the following alarms will not trigger an AU-AIS alarm?
Question24: Which of the following statements about the frame structure of SDH signals are correct? (Multiple choice)
Question25: SL64 board can be used for OSN2500.
Question26: Coherent reception uses a local oscillator laser of the same frequency to coherently receive the optical signal. Which of the following information can be recovered from the received signal? (Multiple choice)
Question27: When the sender detects that b6-b8 of the K2 byte is 110, it means that the sender reports a () alarm.
Question28: In OSN550, the CX slot contains a function board integrating the system control and communication (SCC) unit, the cross-connect unit and the clock unit. There are many types of function boards according to the functions and access functions provided by OSN550.
Question29: Which aspects of the fiber core have a decisive influence on the characteristics of optical fiber?
(Multiple choice)
Question30: MPLS label allocation is divided into static allocation and dynamic allocation. There is no allocation principle for statically allocated labels, as long as the values of each label are different.
Question31: The management scope of O MSn is the path from the input optical port on the multiplexer unit at the sending site to the output optical port on the demultiplexer unit at the receiving site, which is called the optical multiplex section (OMS) path.
Question32: Compared with the dense wavelength division multiplexing system, the sparse wavelength division multiplexing system greatly reduces the cost of the system and has very strong flexibility while providing a certain number of wavelengths and a transmission distance within 100 kilometers.
Question33: OTM nr.m consists of a maximum of "n" optical multiplexed channels and does not support non- channel related overhead. The letter "r" indicates reduced functionality.
Question34: Which of the following statements is wrong?
Question35: When there is no frequency difference and phase difference between VC-4 and AU-4, and between VC-12 and TU-12, the AU-PTR value is 522 and the TU-PTR value is 70.
Question36: The subnet mask of 255.255.255.248, according to the calculation formula, can accommodate 23 devices, or 8 devices.
Question37: In terms of protection capability, which of the following topologies has the strongest protection capability?
Question38: Which of the following statements about overhead bytes is wrong?
Question39: Which of the following are components of a WDM system that multiplexes N wavelengths? (Multiple choice)
Question40: 1000BaseSX uses single-mode optical fiber and light with a wavelength of 1300nm to transmit services.
Question41: The last 256 columns in the OTN frame structure are the FEC area, which is used for forward error correction.
Question42: The segment overhead of STM-16 is 9*8*16 bytes/frame.
Question43: HUB is a multi-port repeater. When HUB is the central device, if a line in the network fails, it will not affect the operation of other lines.
Question44: The process from C4 to VC4 during the multiplexing process is rate adaptation.
Question45: In the network management system, the network element performance monitoring time is set to () minutes and () hours.
Question46: Which of the following does L refer to in the optical module parameter L-64.1?
Question47: Which of the following is not included in the basic architecture of MPLS L2VPN?
Question48: Which of the following are device-level protection solutions for SDH products? (Multiple choice)
Question49: The single-fiber bidirectional wavelength division multiplexing system uses only one optical fiber to realize the simultaneous transmission of optical signals in two directions in one optical fiber. The optical signals in the two directions should be arranged at different wavelengths.
Question50: Compared with traditional SDH and SONET equipment, which of the following advantages does OTN have? (Multiple choice)
Question51: Which of the following descriptions about the PANEL panel on Optixtrans D908 is wrong?
Question52: Are the following statements about the definition of SDH correct?
Question53: Which of the following options are low-loss areas of single-mode optical fiber? (Multiple choice)
Question54: Which of the following statements are correct regarding the use of J0 bytes? (Multiple choice)
Question55: The high-speed railway engineering disaster prevention and communication interface is the () interface.
Question56: The Ethernet board has an external port (Port) and an internal port (VCTRUNK). The external port can set the Tag attribute, but the internal port cannot set the Tag attribute.
Question57: Which of the following is the difference between AU pointer and TU pointer? (Multiple choice)
Question58: Subnet division can reduce network traffic, improve network performance and simplify management.
Question59: Compared with traditional WDM, which of the following options does OTN have advantages?
(Multiple choice)
Question60: Nonlinear effects are closely related to optical power. To prevent nonlinear effects, the total optical power on the optical fiber should be less than 29dBm.
Question61: Which of the following are the basic functions of U2000? (Multiple choice)
Question62: What kind of cascading method does the EoS board of OptiX OSN equipment use to form VCTRUNK?
Question63: By default, if the B2 bit error exceeds which of the following thresholds, a B2-EXC alarm will be generated?
Question64: For a (local) HA solution where the active and standby servers are deployed at the same location, which of the following platforms can be deployed? (Multiple choice)
Question65: In which ITU-T recommendation is the OTN frame structure defined?
Question66: Which of the following is the meaning of SFD in the Ethernet frame structure?
Question67: In the system control unit, which of the following databases will not lose data after a power failure?
(Multiple choice)
Question68: MPLS is a label forwarding technology. Which of the following was its original design purpose?
Question69: By default, a B2-EXC alarm is reported when the number of B2 bit errors exceeds the () threshold.
Question70: What is the structure of STM-16?
Question71: SDH signals must be scrambled before transmission over optical fiber.
Which of the following bytes is not scrambled? (Multiple choice)
Question72: Optical fiber loss includes bending loss, absorption loss and scattering loss.
Question73: There are three types of multi-level connection monitoring modes (TCM) in OTN. Which of the following are correct? (Multiple choice)
Question74: SES: There are 5% or more error blocks or at least one defect (OCI/AIS/LCKYAE/LTC/TIM/PLM) within one second.
Question75: Which of the following is a VLAN classification method? (Multiple choice)
Question76: Which of the following alarms will not trigger an AU-AIS alarm?
Question77: Which of the following is the main advantage of SDH? (Multiple choice).
Question78: Modulation is the process of processing the information of the signal source and adding it to the carrier to make it suitable for channel transmission. It is a technology that changes the carrier with the signal. There are two types of modulated signals, namely analog signals and digital signals. Using analog signals to control the change of carrier parameters is called analog modulation; using data signals to control the change of carrier signal parameters is called digital modulation.
Question79: Which of the following communication protocols does Huawei equipment not support for DCN networking?
Question80: Which of the following is the monitoring overhead used to monitor and report OTUk_DEG and OTUk_EXC alarms.
Question81: A subnet can contain other subnets.
Question82: If a weak signal light and a strong pump light are transmitted simultaneously in an optical fiber, and the wavelength of the weak signal light is within the Raman gain bandwidth of the pump light, the energy of the strong pump light is combined into the oscillation mode of the silicon material of the optical fiber through stimulated Raman scattering (SRS), and then emitted at a longer wavelength, which is the wavelength of the signal light, thereby amplifying the weak signal light and obtaining Raman gain.
Question83: The SDH optical interface only scrambles the electrical signals.
Question84: Which of the following planes does the ASON network have more than the traditional network?
Question85: Which of the following networking types is optical line protection mainly used in?
Question86: Among the maintenance signals at the ODUk level, which of the following maintenance signals are included in the STAT bits of PM and TCM? (Multiple choice)
Question87: Which of the following are the logical function modules involved in clock information processing?
(Multiple choice)
Question88: Which of the following descriptions about the slot settings of the OSN 6800 subrack is wrong?
Question89: Which of the following databases is used by U2000 on PC/WIN2003?
Question90: Which of the following factors determine that the optical signal-to-noise ratio (OSNR) at the receiving end is reduced to a certain extent? In the WDM system, after the signal is transmitted for a certain distance, the optical signal-to-noise ratio (OSNR) at the receiving end is reduced to a certain extent. Which of the following is the main reason?
Question91: TNG 1N401 board supports mixed transmission of multiple ODUk particles.
Question92: In a wavelength division multiplexing system, when the number of wavelengths is less than how many, is it ideal to use a dielectric thin film filter?
Question93: For OTN interfaces without optical layer overhead, in order to achieve monitoring purposes, OTUk/OTUk-v/OTUkV and OTUCn signals are terminated when the interface signal is terminated.
Question94: Which of the following device domains can be managed by U2000? (Multiple choice)
Question95: Both PDH and SDH have globally unified standards.
Question96: When 61.2M PDH signal is mapped into VC12, the mapping method used is ().
Question97: PWE3 is a processing mechanism that simulates the key attributes of a certain service and transmits it end-to-end on the PSN network through a tunnel (IP/MPLS).
Question98: The clock unit can only access the external clock source as the timing signal source of the system through the external clock interface. In addition, it can also output the processed clock and provide the clock source for other devices that need timing.
Question99: The value range of U-PTR is 0~782. When the receiving end receives invalid pointer values for 8 consecutive frames, which of the following alarms will the device generate?
Question100: The TTI in the segment monitoring overhead SM provides TIM mode setting selection. Which of the following options are available? (Multiple choice)
Question101: Under which of the following scenario combinations can the rerouting and automatic wavelength change functions of the optical layer ASON network be realized?
Question102: In the network interface of OTN, the network interface within the same operator is the intra-domain interface, which is further divided into the interface between equipment from different manufacturers, IaVI, and the interface within the subnet of equipment from the same manufacturer, IrVI, according to the different equipment manufacturers.
Question103: Which of the following is the unit that converts non-standard wavelengths to standard wavelengths specified by ITU-T?
Question104: The standard Ethernet frame length should not be less than 64 bytes. Which of the following factors will lead to this limitation? (Multiple choice)
Question105: The frame rate () and transmission rate of different levels of STM levels are different.
Question106: In case of SNCP, the line board selectively receives the service. Therefore, SNCP can protect the service on the line.
Question107: The difference between ASON network and ordinary network is that it introduces the concept of signaling.
Question108: When configuring the OSN3500 with SXCS boards, which of the following is the access capacity of a fully configured subrack?
Question109: The nominal rate of the OTU4 signal is 111809973.568 kbits, and we can generally consider the line rate to be about 112G.
Question110: What are the advantages of ESC? (Multiple choice)
Question111: Which new unit is added to Liquid OTN?
Question112: Which of the following is the step for China to multiplex 2M into AUG?
Question113: In the Colored & Directed scenario of 4D ROADM, how many sets of M40V+D40 are needed to dispatch local services to four directions?
Question114: How many management unit pointers are there in the STM-64 frame structure?
Question115: Which of the following bridges are used to forward data based on the MAC address and VLAN ID carried in the data?
Question116: MS-AIS and MS-RDI belong to a group of warning information, and the generation of this alarm is related to both K1 and K2 bytes.
Question117: E1 has three modes: framing, multi-framing and unframing. The main difference is the time slot used for transmitting valid data.
Question118: Consider an optical fiber as a "multi-lane" public road. The traditional TDM system only uses one lane of this road. Increasing the bit rate is equivalent to speeding up the driving on this lane to increase the transportation volume per unit time. Using DWDM technology is similar to using the unused lanes on the public road to obtain the huge untapped transmission capacity in the optical fiber.
Question119: Which of the following media types has a transmission distance of no more than 1 km?
Question120: What functions does the SDH overhead byte perform? (Multiple choice)
Question121: Which of the following are not passive optical devices? (Multiple choice)
Question122: The size of OTUk frame is variable.
Question123: The frame structure of TU3 is a bit incomplete, and the gap needs to be filled. This can effectively prevent which of the following phenomenon?
Question124: What is the first condition that a network needs to have in order to have protection capabilities?
Question125: Which of the following descriptions about the FIU board is correct?
Question126: The information payload area stores only the information payload.
Question127: Mapping is the process of adapting branch signals into () at the boundary of the SDH network.
Question128: Which of the following protections requires the use of the APS protocol?
Question129: The technology of using a local oscillator laser of the same frequency to coherently receive the optical signal and recover the amplitude, phase and polarization state information from the received signal is called coherent reception technology.
Question130: Which of the following is a functional unit that provides serial data to the interface and system associated with the orderwire telephone?
Question131: Which of the following options are low-loss areas of single-mode optical fiber? (Multiple choice)
Question132: Which of the following alarms will definitely trigger optical line protection switching? (Multiple choice)
Question133: After configuring PDH services on a per-network element basis, a complete trace cannot be searched. Which of the following is a possible reason? (Multiple choice)
Question134: Which of the following is correct about the difference between a wide area network and a local area network?
Question135: The STAT indicator on the SDH board flashes red, on for 100ms and off for 100ms. Which of the following is the meaning of the indicator status?
Question136: TU-AIS is often encountered during network maintenance. Which of the following alarms can trigger a TU-AIS alarm? (Multiple choice)
Question137: NGWDK adopts LO-L1+L2 triple-extension architecture, in which the L2 layer implements switching based on Ethernet/MPLS-TP, the L. layer implements switching based on ODUk/C, and the L. layer implements switching based on I/O.
Question138: Ethernet_II and IEEE802.3 frame types are distinguished by the Type/Length field value; most data frames in Ethernet use the Ethernet_II format.
Question139: The OTN electrical layer SM, PM, and TCMi overheads all contain a 1-byte BIP8 field, and the frame structure ranges they monitor are different.
Question140: In WDM systems, the reduction in optical signal-to-noise ratio is mainly due to the increasing amount of noise introduced into the optical fiber line.
Question141: NCE's software deployment method adopts B/S (Browser/Server) architecture.
Question142: What does the optical layer overhead include? (Multiple choice)
Question143: In a wavelength division system, after a certain distance of transmission, the optical signal-to-noise ratio of the receiving end signal will be reduced to a certain extent. Which is the main reason?
Question144: Which of the following is not an advantage of WDM?
Question145: Which of the following IP addresses is a Class C IP address?
Question146: Which of the following elements does a data communication network have in terms of equipment?
(Multiple choice)
Question147: WDM multiplexes optical signals at multiple speeds (wavelengths) through one optical fiber for transmission. The digital signals carried by these optical signals must have the same speed and data format.
Question148: In the electric power dispatching system, dispatching data is transmitted in the transmission network and data network in the form of Ethernet services.
Question149: The rate of STM-0 is 51.84Mbit/s; (STM-0 is used for digital microwave).
Question150: OTN has its own unique frame structure and rich overheads to operate, manage and maintain signals during transmission, such as SM, PM and TCMi overheads to monitor service signals at each level.
Question151: What client-side service signals does the TNG1T401 board support? (Multiple choice)
Question152: Compared with PDH, the main advantages of SDH are reflected in which of the following aspects?
(Multiple choice)
Question153: RSOH, MSOH, HPOH and LPOH implement monitoring functions in descending order of monitoring range.
Question154: Which of the following descriptions about the MD02 board is wrong?
Question155: If a network port that supports auto-negotiation is connected to a network port that does not support auto-negotiation, half-duplex may be used instead of full-duplex.
Question156: If one device does not support auto-negotiation, but the other device does, the other device may operate in half-duplex mode (Q107).
Question157: When the rate of the SNCP ring composed of four OptiX OSN2500 devices is 2.5 Gbit/s, the service capacity of the network can carry a maximum of () 2 Mbit/s signal
Question158: What principle of light is used when light propagates in optical fiber?
Question159: Additional services cannot be configured on the protection channel of 1:1 linear multiplex section protection.
Question160: Two PD1 boards and one DMS board jointly implement the TPS protection function.
Question161: Which of the following is protected by the channel protection ring?
Question162: OLA stations can also be monitored using ESC.
Question163: When Severely Errored Seconds (SES) occur in the PM portion of the ODUk layer, which of the following alarms will the NMS report?
Question164: Fiber amplifiers can be divided into rare earth ion doped fiber amplifiers (Rare Earth Ion Doped Fiber Amplifier) and nonlinear fiber amplifiers. The working principle of rare earth ion doped fiber amplifiers is stimulated radiation; while nonlinear fiber amplifiers use the nonlinear effect of optical fibers to amplify optical signals.
Question165: The receiving end performs BIP-8 check on the received STM-16 frame before descrambling. The result of XOR with the B1 byte of the next STM-16 frame received is 10001100. This means that several error blocks have occurred in the STM-16 frame. Which of the following options is correct?
Question166: Two beams of light that meet the coherence condition are called coherent light. Two coherent light beams will produce interference phenomenon in the area where they meet. Which of the following meet the coherence condition? (Multiple choice)
Question167: EPL services use ports and bandwidth exclusively, and different users may need to share resources.
Which of the following methods can be used to isolate user data?
Question168: FOADM includes parallel FOADM and serial FOADM, both of which support any wavelength up to
40 wavelengths or 80 wavelengths.
Question169: One VC-4 can transmit () VC-12, that is, (63) 2.048 Mbit /s signals.
Question170: Which of the following descriptions are correct? (Multiple choice)
Question171: FAS is the frame alignment overhead with a length of 6 bytes. The 1st to 3rd bytes are 3 OA1 bytes, each OA1 is always "1111 0110"; the 1st to 6th bytes are 3 OA2 bytes, each OA2 is always "0010 1000".
OA1 and OA2 are the frame alignment bytes of this frame signal, which are equivalent to A1 A2 in the SDH frame structure.
Question172: Sending test frames will affect normal business.
Question173: Ethernet service OAM focuses on the maintenance of end-to-end Ethernet links, while Ethernet port OAM focuses on the maintenance of point-to-point Ethernet links between two directly connected devices.
Question174: The refractive index of the core n1 () and the refractive index of the cladding n2 are necessary conditions for the transmission of optical signals in optical fibers.
Question175: In the OTN mapping path, the ODUk signal can only be obtained by mapping the OPUk signal at the same level.
Question176: Which of the following is not an advantage of using QinQ technology?
Question177: Establish an Ethernet private line service between H (HQ) and H2 (branch) of the enterprise, and bind 5 VC-12s in the corresponding VCTRUNK. When one C-12 fails, the Ethernet private line between H and H2 will not be interrupted. Therefore, which of the following statements is correct?
Question178: OTN technology is developed based on SDH and WDM technology, and combines the advantages of both technologies.
Question179: Manual configuration will clear the data on the NE side
Question180: For OSN3500, which of the following boards provides centralized backup function for the +33V power supply of each board in the subrack?
Question181: Which of the following options belong to the functions in the NCE-T analysis domain? (Multiple choice)
Question182: EPL service uses the bandwidth on the line exclusively, which is very safe. It is suitable for dedicated line applications for VIP customers.
Question183: The 48 wave OTM site needs to be equipped with an OAU amplifier for signal amplification.
Question184: The primary and backup ports of the linear multiplexing segment must be on the same board.
Question185: When BIP-8 in the OTUk segment monitoring overhead SM detects a bit error block, what alarm may be reported? (Multiple choice)
Question186: SDH is a complete hierarchical structure of standardized digital signals that can be used for synchronous digital transmission, multiplexing and cross-connection.
Question187: Which subtype of tributary SNCP protection requires no electrical relay station in the subnet along which the ODUk signal passes?
Question188: When the working channel of the optical line protection fails, it cannot automatically switch to the protection channel. What are the possible reasons? (Multiple choice)
Question189: Which of the following factors will trigger the automatic switching of the multiplex section protection ring? (Multiple choice)
Question190: What is the line code type of the commonly used SDH optical interface?
Question191: Which of the following options are available for ODUk SNCP switching conditions? (Multiple choice)
Question192: Which of the following statements about the MSP ring are correct? (Multiple choice)
Question193: When the U2000 is synchronized, the NE data that is the same as the U2000 is not uploaded to the U2000, and the data that exists on the 2000 but not on the NE is deleted.
Question194: Number of signal bytes/frame rate of signal = ()
Question195: When the 80-wavelength OTM site uses M40V for wave combining, it is also necessary to configure an ITL board.
Question196: Which of the following bytes can be used for wired calls between two REG devices?
Question197: Which of the following site types support business up and down? (Multiple choice)
Question198: MAC forwarding table: Which of the following items does it contain? (Multiple choice)
Question199: The backplane has two -48V power lines, and each board obtains two 48V power supplies from the backplane. After the power is combined through the diode, the various voltages required by each component are obtained through the DC/DC power module and linear conversion.
Question200: In Ethernet, the frame length has a lower limit, which is mainly due to the following considerations?
Question201: In actual wavelength division systems, systems with rates of 100G and below are less affected by polarization mode dispersion.
Question202: The number of ODU2e signals multiplexed into the ODU3 signal is the same as the number of ODU2 signals multiplexed into the ODU3 signal.
Question203: Forced switching, fiber switching, manual switching and motion switching are in descending order of priority.
Question204: SDB is a hierarchical structure of standardized digital signals that can be used for (), multiplexing and cross-connection
Question205: Which type of board does TQM belong to?
Question206: Which of the following is the common point between the two-fiber bidirectional multiplex segment shared protection ring and the four-fiber bidirectional multiplex segment protection ring?
Question207: When the ACT indicator light of the SDH board is off, it means that the board has a hardware failure and cannot be used.
Question208: Which of the following options are considered to be deficiencies of OTN? (Multiple choice)
Question209: The initial value of the Sequence number in the ETH PWE3 encapsulation frame format is randomly generated, and the value decreases by one each time a data packet is sent.
Question210: Refers to the bit used to align and indicate the corresponding AU or VCr so that the fast end can correctly remove the independent VC from the STMN, and then separate the VC and C package into a single low-rate signal, such as FDH. In other words, the rate tributary signal can be directly discarded from the STMN signal
Question211: Which of the following alarms will not generate corresponding alarms?
Question212: In a small network, the function of an OptiXtrans DC908 is equivalent to that of a high-density electrical layer device FOADM + OLA.
Question213: What are the main advantages of WDM? (Multiple choice)
Question214: When 2M PDH signal is mapped into VC12, the mapping method used is ().
Question215: Which of the following is the meaning of "L" in the optical module parameter "L-642"?
Question216: GFP-F is a packet data (PDU) oriented processing mode. It encapsulates the entire packet data into the GFP payload information area, does not make any changes to the encapsulated data, and decides whether to add a payload area detection domain based on needs.
Question217: Which of the following modulation technologies is currently used in 100G wavelength division systems?
Question218: Which of the following options is emitted from an ordinary light source, which has all possible vibration directions and is symmetrical to the direction of light propagation?
Question219: In Recommendation ITU-TG692, the allowed signal frequencies are based on the reference frequency () and the channel spacing can be 100 GHz, 50 GHz or 25 GHz.
Question220: Which of the following is the switching point of linear multiplex segment protection?
Question221: TNV2E224 board does not support which of the following types of protection?
Question222: OTUk_UAS is the unavailable seconds of the optical transmission segment. Unavailable seconds refer to severe error seconds that last for more than 10 seconds. In this case, the unavailable time starts from the 11th second, but the severe error seconds of these 10 seconds are also counted into the unavailable time. When severe error seconds disappear for more than 10 seconds, the available time starts from the 11th second, and the 10 seconds without severe error seconds are also counted into the available time.
Question223: 1:N linear multiplex section protection: when the working channel is unavailable, the service is switched to the protection channel for transmission, and the additional service originally transmitted on the protection channel is interrupted.
Question224: Which of the following statements about OTM-nm and OTM-nr.m, the optical layer interfaces of OTN are wrong?
Question225: Which of the following statements about signal label byte C2 is wrong?
Question226: Which of the following layers of overhead belong to the electrical layer overhead of OTN? (Multiple choice)
Question227: After mapping and multiplexing, 4 ODU2 signals can be multiplexed into 1 OTU3[V] signal. For ODU2e signals, only 3 signals are needed to be multiplexed into 1 OTU3[V] signal.
Question228: In the integrated DWDM system, the transmitting light source must strictly comply with the G.693 optical port specifications.
Question229: On the two-fiber bidirectional multiplex section protection ring, the first half of the VC-4 of each STM-N line is the working channel, and the second half of the VC-4 is the protection channel.
Question230: Which of the following protocols in the OTN standard system involves the optical transport network interface?
Question231: QINQ technology solves the problem of insufficient VLAN resources and provides L2 VPN that is cheaper than MPLS. Therefore, the application scenarios of QINQ are much wider than MPLS.
Question232: Which of the following optical loss alarms will not cause service interruption? (Multiple choice)
Question233: When the low-level resources of the device are insufficient, which of the following measures can be taken? (Multiple choice)
Question234: In the SDH multiplexing structure, the rate represented by VC-12 is ().
Question235: Which of the following is the multiplexing method of SDH?
Question236: Which of the following technologies is the main difference between open DWDM system and integrated DWDM system?
Question237: Which of the following is not a northbound interface provided by U2000?
Question238: Multicast forwarding can be understood as selective broadcasting. The host listens to a specific multicast address, receives and processes frames whose destination MAC address is the multicast MAC address.
Question239: Two beams of light that meet the coherence condition are called coherent light. Which of the following options are referred to as the coherence condition here? (Multiple choice)
Question240: Frame-Mapped GFP (GFP-F) is a processing mode for data encoding blocks (such as Fibre Channel and ESCON).
Question241: A local area network is a network formed by interconnecting various communication devices in a small area. Its characteristics are: short distance, low delay, high data rate and reliable transmission.
Question242: TU-AIS is often encountered during network maintenance. The existence of AU-LOP alarm in the network will not trigger this alarm.
Question243: Both QinQ and MPLS can provide users with L2 VPN services, but QinQ is cheaper and simpler than MPLS.
Question244: What is the frame structure of STM-16?
Question245: Regarding the comparison between Raman amplifier and EDFA, which of the following statements is wrong?
Question246: MSTP supports dynamic allocation of bandwidth based on the amount of data.
Question247: How many 2M business work boards does OSN 7500 support at most? Which of the following is correct?
Question248: The 1+1 protection mechanism on the customer side implemented by the SCS board or the OLP board is different.
Question249: The optical amplifier unit can compensate for line loss and increase transmission distance. Through multi-stage cascading, the system transmission distance can be extended to infinity.
Question250: Which of the following is not a nonlinear effect?
Question251: For Huawei equipment, NODE ID is the unique identifier of the intelligent network element in the control plane. After the network is configured with intelligent services, the NODE ID will no longer be modified during construction.
Question252: What are the main losses of optical fiber? (Multiple choice)
Question253: For OSN products, changing which of the following parameters will cause the network element to reset?
Question254: OL board, OLA board and OPC board can all amplify optical signals.
Question255: H4 is used to indicate the () and () of the payload.
Question256: Which of the following values has the highest clock quality?
Question257: The power SCADA business and communication interface of the power supply system is () interface.
Question258: When the optical fiber is connected but the business is not available, E1 or E2 bytes can be used for official communication between the sites.
Question259: OLT is connected to the switch through () and uses the V5.2 interface protocol.
Question260: Among the following modulation technologies, which one performs best in terms of wavelength stability?
Question261: Linear MSP (LMSP) has two modes: 1+1 and 1:1. Additional services can only be configured for the protection channel in the 1:1 mode of LMSP.
Question262: User management can ensure the security of user information and system. The core of user management is to achieve decentralized management.
Question263: Compared with traditional SDH and SONET equipment, OTN has up to 6 levels of TCM monitoring capabilities.
Question264: The most effective subnet mask in a point-to-point WAN link is 255.255.255.252.
Question265: LCK insertion takes precedence over AIS insertion. That is, if the user configures LCK insertion and the conditions for automatic AIS insertion are met, LCK is inserted.
Question266: AAC address consists of 46 bits and is globally unique. Which of the following is the meaning of a MAC address with the eighth bit being 1?
Question267: HONET integrated service access network belongs to () access method.
Question268: Users can easily access NCE through a browser without having to install additional traditional client software.
Question269: Currently, the most commonly used signal is 2Mbit/s. Which of the following steps are involved in the process of multiplexing 2Mbit/s signals into STM-N? (Multiple choice)
Question270: Which of the following boards supports QinQ function?
Question271: Which of the following local maintenance terminals can be used to manage MSTP equipment?
Question272: Regarding the AU-AIS alarm, which of the following statements is correct?
Question273: How many frames is the minimum interval between two adjacent pointer adjustment events?
Question274: The LOI low-level interface includes multiple logical function blocks. Which of the following does not belong to the function blocks in the LOI low-level interface?
Question275: Which of the following correctly describes the order in which the signal flow between the SDH interface and the cross-unit passes through the module units?
Question276: Which of the following descriptions of OTM-nm and OTM-nr.m optical layer interfaces of OTN is wrong?
Question277: Which of the following is not an advantage of Raman amplifier?
Question278: Which of the following options does not belong to the application scenarios of survival analysis?
(Multiple choice)
Question279: Which of the following descriptions about signal marker byte C2 is wrong?
Question280: VLAN domain can isolate unicast messages of different users, and also isolate broadcast messages of different VLANs.
Question281: U2000 client can be installed on Windows, Solaris and SUSE Linux operating systems.
Question282: TNG1M404DM board can realize the multiplexing of 4 100Gbit/s services to 2 200G wavelength conversion boards.
Question283: Which of the following maintenance signals is transmitted from a downstream site to an upstream site of an OTN?
Question284: If the virtual cascade group at one end of the equipment has LCAS enabled, but the other end has not enabled LCAS, the local end reports the LCAS_FOPR alarm.
Question285: U2000 can flexibly interconnect with different third-party network management systems through the Northbound Interface (NBI) and provide physical inventory and alarm information to upper-level network management systems.
Question286: Which of the following options are included in the alarm level in the NCE-T system? (Multiple choice)
Question287: In the SDH optical synchronous transmission system, which of the following bytes is used to transmit the quality and usage information of the clock source?
Question288: Which of the following does not belong to wavelength division service adjustment?
Question289: Which of the following service nodes can be connected via a transport network? (Multiple choice)
Question290: In addition to positioning, the pointer can also accommodate differences in frame rate to a certain extent.
Question291: MSTP (Multi-Service Transport Platform) is a multi-service transmission technology based on (), which can simultaneously realize the access, processing and transmission of multiple services such as TDM, ATM, Ethernet, IP, etc.
Question292: Which of the following options are correct regarding 1:1 optical line protection? (Multiple choice)
Question293: PDM uses a polarization beam splitter to split the laser into two perpendicular directions: x and y.
Question294: TM is a terminal multiplexer, and its functions are: the line end inputs/outputs one STM-N signal, and the branch port can output/input multiple low-speed branch signals.
Question295: IEEE802.3 standard is developed for which of the following technologies?
Question296: Which of the following networking forms supports additional service configuration?
Question297: A bidirectional ring means that the routes for sending and receiving services are consistent, that is, they correspond to consistent routes.
Question298: The dispersion coefficient is the time delay difference caused by the optical wavelength signal passing through the unit length of optical fiber within the unit wavelength interval. Which of the following is the unit of the dispersion coefficient?
Question299: Which of the following logic function blocks is used to process and generate AU-PTR?
Question300: Which of the following descriptions of ODUk_PM_BDI is correct?
Question301: Communication networks can be divided into local area networks, wide area networks, and metropolitan area networks between local area networks and wide area networks according to the geographical scope they cover. The characteristics of wide area networks are low latency, high data rate, and reliable transmission.
Question302: R-LOS alarm has nothing to do with overhead bytes but only with the input signal quality.
Question303: From the formula: OTUk rate = 255/(39-k) × STM-N rate, we can get OTU4 rate = 255/235 × STM-N rate.
Question304: Which of the following ITLI-T recommendations define the OTN frame structure?
Question305: For ODUk SNCP protection, if the pass-through site is an electrical relay site, it is recommended to configure the SNCP type as SNC/I when configuring the protection.
Question306: In the case of 1+1 linear MSP, which of the following switching modes does not require the APS protection protocol to be enabled? (Multiple choice)
Question307: The rate represented by STM-1 is ().
Question308: The unprotected chain consists of four network elements: NE1, NE2, NE3, and NE4. An end-to-end VC4 path NE1-NE4 is created, and NE5 is added between NE2 and NE3 for capacity expansion. The original configuration remains unchanged, and no service is configured on NE5. In this case, the unprotected chain becomes NE1-NE2-NE5-NE3-NE4. How many VC4 paths can be searched out?
Question309: U2000 provides physical view, Layer 2 view, RPR view, IP view, cluster subnet and MPLS TE view, allowing users to browse from different perspectives.
Question310: The two PIU/APIU boards of the OptiXtrans E6616 or E6608 (0ptiX OSN 1800 V Pro or 1800 1 Pro) equipment use hot backup to power the system. When one PIU/APIU board fails, the system can still work normally.
Question311: () is a parameter used to describe the reliability of the transmission system.
Question312: The frame period of OTN signal is fixed and the same as the frame period of SDH signal.
Question313: Which of the following descriptions about full-duplex Ethernet is wrong?
Question314: Which unit is newly added in Liquid OTN?
Question315: Which of the following descriptions of ODUK_PM_BDI is correct?
Question316: In a 25GMSP ring consisting of four MSTP sites, which of the following statements about alarm reporting are correct when protection switching occurs?
Question317: The EDFA inside the THBIDAP board has the () function. When one or several channels are added or reduced or the optical signals of some channels fluctuate, the signal gain of other channels will not be affected.
Question318: STM-N signals must be scrambled when transmitted on the line, mainly to facilitate the receiving end to extract the line timing signal. All bytes in the SDH frame structure will be scrambled.
Question319: Which of the following methods are included in WDM networking and application? (Multiple choice)
Question320: The segment overhead of STM-4 is 9+9+4 lines/frame.
Question321: Physical port: also known as MAC port, which is the external port of the board.
Question322: Which of the following bytes in the regenerator section overhead are associated with ROOF and R- LOF? (Multiple choice)
Question323: The 1310nm and 1550nm transmission windows are low-loss windows. In a DWDM system, only the 1550nm transmission window is used. Which of the following is the main reason?
Question324: In the OLT+ONU combined networking mode, OLT mainly plays the role of (), so the OLT equipment is required to have good performance and be able to provide sufficient bus bandwidth.
Question325: The essence of OPSK modulation is to reduce the baud rate of the optical signal by half without reducing the line rate by washing four possible values on the phase of the optical field; this multiplexing method can reduce the spectral bandwidth of the optical signal by half, making multi-wavelength ULH transmission with 50GHZ interval and 40G line rate possible.
Question326: Which of the following descriptions about ROADM are correct? (Multiple choice)
Question327: STM-64 has () AU pointer.
Question328: Which of the following reasons will not cause the network management to report a MUT_LOS alarm?
Question329: Which of the following is not one of the main characteristics of SDN?
Question330: Which of the following is a functional unit that provides high-speed signal interface and processes corresponding signals?
Question331: Which of the following options are the main characteristics of the transmission network? (Multiple choice)
Question332: Which of the following options does the 802.1Q tag header contain? (Multiple choice)
Question333: From the following barcode 02846710HC000085 Y1 LPS-FRM800-PIU, it can be seen that the production date of this board is December 2017.
Question334: G.707 multiplexing line diagram can only multiplex 2M\34M\140M signals into STM-N.
Question335: OPC is an optical layer platform board that needs to be used with a pluggable module to work properly.