EMT Practice Test

1. Question Content...

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Question1: After the AM function of the microwave equipment is enabled, the signal level of the high modulation mode is lower than that of the low modulation mode.

Question2: After the single main control is replaced with the main control, the new main control is inconsistent with the previous failed main control software, which alarm may be reported by the network element

Question3: The interface board N1SF64 of OSN 7500 and the A1SF64 of OptiX 10G (Metro 5000) support different protocols, so they cannot be connected.

Question4: Among the following methods, which is the effective way to avoid discrete business? (multiple choice)

Question5: Generally, which of the following is not included in the performance evaluation of a WDM network

Question6: When configuring the Ethernet service, the value of the J1 byte in the higher-order channel overhead should be the same as the value that should be received, but the Ethernet single board EGT2 and EFS0 both generate the HP_TIM alarm. C

Question7: When configuring client-side 1+1 protection, if the working OTU and the protection OTU are on different network elements, the control channel board type can be OLP or SCS board

Question8: Throughput refers to the maximum rate of the network without frame loss. During the test, the test starts from the maximum line rate frame rate Xmax that the device can support. When the device starts to lose frames, reduce the frame rate. When the device does not lose frames Time, increase the frame rate

Question9: GR (Graceful Restart) is one of the key technologies to provide HA. GR can make the entire system uninterrupted in the event of a failure switch, and can realize rapid network convergence under normal conditions.

Question10: When planning AM, you need to consider the priority planning of E1. Which of the following options are the planning principles of E1 priority (multiple choice)

Question11: User A and user B belong to the Team group. User A has a file File1.
After running the command "$ chmod 750 File1", the following statement is wrong.

Question12: The board types that need to be upgraded when NG-SDH equipment is upgraded are: 1. Cross-connect board 2. Main control board 3. Service board. What is the correct upgrade sequence?

Question13: In the test item of IEEE 1588V2 time protection function, what is wrong?

Question14: Which of the following descriptions of the 100G system protection configuration is correct ()?

Question15: The following is the network parameter planning of an engineer's network management server, the correct one is (multiple choice)

Question16: What's wrong with the description of the 1+1 protection on the client side?

Question17: Optical wavelength sharing protection OWSP is used to configure a ring-type network of distributed services. By occupying two different wavelengths, it can protect all the distributed services between all sites and protect multiple services at the same time.

Question18: When the capacity of the cross-connect board is upgraded, the dual-cross configuration site is replaced, and there will be two cross-connect boards with different capacities at the same time. At this time, the cross-connect board switch will cause a long-term business interruption.

Question19: When deploying QoS, where the complex classification of data flows is usually deployed in the network

Question20: Commonly used methods to improve the utilization of network resources are (multiple choice)

Question21: What is correct about traffic policing and traffic shaping?

Question22: The following statement about PTN's VPLS technology is wrong,

Question23: A certain system is configured with SOM, only the optical power information is in the query spectrum analysis data, and the OSNR is displayed as "---". The OSNR is abnormal at this time, the possible reason is ()?

Question24: When shutting down the U2000 dual-computer system (Solaris), the following commands will be used:
① $ ./stopnms.sh
② 1> shutdown SYB_BACKUP 2> go
③ shutdown -y -g0 -i5,
④ # sync; sync; sync; sync
The correct order in which these commands appear is ()

Question25: Regarding the differences between Linux and Solaris operating systems, the following statement is wrong ()

Question26: The function of PW OAM is basically the same as that of Tunnel. The PW OAM mechanism can effectively detect, confirm and locate defects and faults originating from the PW layer network.
Which of the following functions are not available in PW OAM?

Question27: In the 40-wavelength system of the wavelength division equipment, due to the aging of the customer's optical cable, the optical cable is replaced between 2# and 3#, and 4# optical amplifier site needs to be added between 2# and 3#. Which of the following statements is correct?

Question28: Error code is a common phenomenon in equipment maintenance. Which of the following phenomena may cause error code? (multiple choice)

Question29: The two MSP rings intersect, and one of the network elements at the intersection point has the coexistence of SNCP and MSP protection. How can I solve the secondary switching phenomenon due to the coexistence of protection?

Question30: PID (Photonics Integrated Device) is an optoelectronic integrated device, PID single board can realize multi-wavelength integration, 40Km without optical amplifier, 80Km without dispersion compensation ()

Question31: The following about DCN network planning, the error is

Question32: There are two types of E1 signals: Unframed E1 and Framed E1, among which Unframed E1 refers to all time slots as a whole to transmit user data.

Question33: Regarding file operation and maintenance, the following are wrong ()

Question34: The Tunnel-level APS protection of Hybrid MSTP equipment can support forced switching and locked switching, and the priority of forced switching is higher than that of locked switching.

Question35: During the network acceptance test, it was found that the OSN 3500 can work normally when connected to an external clock source. When the external clock source is disconnected, it enters the hold state, but the hold state cannot last for 24 hours. Please explain the possible reasons.

Question36: What may be the reason why the RAU Raman board cannot gain normally? (multiple choice)

Question37: Four network elements A, B, C, and D form a two-fiber bidirectional multiplex section shared protection ring, and there are a large number of PDH services between A and B.
One day, the fiber between A and B was interrupted. In order to eliminate the R-LOS alarm on the network management system, an engineer self-looped the optical ports at both ends of the interrupted fiber. After 10 minutes by default, what will happen?

Question38: Regarding the UGUUI dual-machine system, which of the following statements is correct is () (multiple choice)

Question39: During the degrading process of the smart business, the intermediate node is reset, and the downstream node will have

Question40: Which of the following is not a simple flow classification

Question41: Which of the following operations may be caused by non-linear effects

Question42: After the OTN device to the storage device is opened, the actual service rate is less than 20% of the interface rate. Possible reasons (multiple choice)

Question43: Regarding the optical power commissioning of the RAU2 board, which of the following options is correct () (multiple choice)

Question44: If there is a problem with the CORBA connection, it can be analyzed as follows: If it is not a problem on the U2000 side, you should find it from the upper-layer network management itself or the U2000 and the upper-layer network management together; the name and notification service cannot be started normally, you should check whether the corresponding port is occupied, or Try to use other ports; if U2000 fails to start, check whether the CORBA configuration files bundle.cfq and ems.cfq are correct

Question45: In the Linux system, configure an IP address of 129.9.1.100 for the network card Eth0, and the command used is ()

Question46: When 15 VC-12 services are created on the STM-1 frame in sequence from 1 to 15, and then VC-3 services are created on the second VC-3 of this STM-1 frame, what is the result displayed by the network management system?

Question47: Colorless & Directionless site configuration of a 100G coherent system, the line dimension adopts WSM9+RDU9, and the local drop configuration can adopt ()? (Multiple choice)

Question48: What kind of alarm will be inserted into the opposite NS3 board when the optical port software is looped back on the NS3?

Question49: In the point-to-point WDM networking scenario, the signal-to-noise ratio of a certain single wave is low, and the other channels are normal. The reason is that it is impossible?

Question50: The OAU105 single board of the OTN system has a maximum output power of 23dBm, and the maximum output power of a single wavelength in the 40-wavelength system can be calculated to be 4dBm

Question51: The reason for reporting the BEFFEC_EXC alarm is that the following statement is wrong

Question52: Which of the following descriptions about the client-side 1+1 protection features is wrong?

Question53: NE1, NE2, NE3, NE4, and NE5 form an MSP ring, and there is an STM-1 link between NE1 and NE3. An SNCP VC-4 service is created between NE1 and NE3. The working source of this VC-4 service is on the MSP working path, and the protection source is on the STM-1 link. SNCP delay time is 100ms. When a fiber break occurs for the first time (between NE1 and NE2), the MSP switches normally. When the fiber is cut for the second time in the MSP ring (between NE3 and NE5), the SNCP service is interrupted and no SNCP protection switching occurs.
What are the solutions?

Question54: The optical amplifier unit can make up for the line loss and increase the transmission distance. The transmission distance of the system can be extended to infinity through the multi-stage cascade method.

Question55: An intelligent clock subnet can realize the automatic tracking and automatic switching of the clock only by configuring the reference clock, avoiding the clock interlock.

Question56: In the network management planning, which of the following descriptions is correct (multiple choice)

Question57: In the Solaris dual-system hot backup system, using "ls -l" to query the file1 file information is "-rwxr-xr-- 2wjm newservice 321 Oct 17 09: 33 file1" The following statement is wrong ()

Question58: Regarding the electrical layer protection ODUk SNCP and branch SNCP, which one is different in the following description

Question59: When which of the following pointers is adjusted, the information payload area carries the most information payload

Question60: When using dual-slot line group MSP ring, in which of the following situations are the multiplex section overhead K bytes in the pass-through state? (multiple choice)

Question61: The GXCS single board of the OptiX OSN3500 equipment is upgraded to SXCS. In the case of active/standby configuration, the business will be interrupted during the upgrade process.

Question62: Network elements A, B, and C are OSN 3500 forming a chain network. The two stations A and C are connected to routers. The IP routers are connected to the OptiX SDH equipment through the POS port of STM-1. The PAS port connects J1 and C2 bytes. It is also used as a payload to transfer bytes (used to carry services). The network element A to the network element C creates a VC4 service, and the network element B uses VC4 to pass through.
In this case, is there an alarm report inside the SDH network?

Question63: The upgrade from GACSA to UXCSB for OSN 3500 equipment is as follows:
1. Replace the spare cross-connect board
2. Switching between active and standby cross-connect boards
3. Replace the original main cross board
4. Data consistency check

Question64: Before configuring SOM, the physical fiber connection from OMCA to the optical amplifier board must be completed, and the logical connection fiber from OMCA to the optical amplifier board does not affect the OMS path generation, so it does not affect the configuration of SOM.

Question65: The maximum number of VBs supported by the EGS4 series of OSN equipment is two, and the maximum number of VBs supported by the EFS4 series single board is 16.

Question66: If the location of the site is appropriate, ROADM sites and OTM sites composed of M40V/D40 back-to-back can all play the role of OEQ sites for pass-through wavelengths

Question67: The following are the time slot optimization steps (multiple choice)

Question68: The following description of cluster management, the error is ()

Question69: It is known that the technical indicators of the GE optical interface of a certain PTN equipment are as follows: average transmit optical power (dBm): -5~0, receiving sensitivity (dBm): -23, minimum overload point (dBm): -3, minimum extinction ratio (dB) ): 9. For this optical interface, which of the following optical power (dBm) is the most suitable received optical power?

Question70: OTN needs to change the original single-wave pass-through from D40 to M40 to use NQ2 as a relay. The error described below is

Question71: Preparation conditions for single-site commissioning of transmission equipment include (multiple choices)

Question72: The single-fiber bidirectional optical interface of PTN equipment distinguishes upstream and downstream service flows according to time slots.

Question73: #1 and #2 are OTM network elements, point-to-point chain services, 1 channel, OAU light emission +4dbm at station A, -35dbm light at the SC2 board at station #2, -30dbm for the OBU board, and -30dbm for the OTU single board. There is no light on the board, what is the most likely cause of the failure?

Question74: During the equipment installation process, the following statement is wrong:

Question75: The following description of OLP optical line protection is wrong:

Question76: Which of the following features does the N3EFS4 board support? (multiple choice)

Question77: What should I pay attention to when swapping antennas? (multiple choices)

Question78: Optical wavelength sharing protection OWSP is used to configure the ring-type network of distributed services, and realizes the protection of all the distributed services between all sites by occupying two different wavelengths.

Question79: For NG-SDH equipment equipped with dual main control, when the main control board is upgraded, which of the following statements is correct?

Question80: Which of the following descriptions about OTN turn on the electrical layer ASON is wrong?

Question81: After a maintenance person failed to start the CORBA interface, he listed several inspection steps.
1. View the log file "%IMAPROOT%/server\var\logs\Develop\nbi\Agent_CORBA\unbi_sys_yyyyMMdd_hhmmss_*.log";
2. Check whether the U2000 License file supports the U2000 CORBA interface function;
3. Check if the %IMAPROOT%/server/ns.ior file is deleted. Is his operation correct?

Question82: The following descriptions about 1+1 protection and 1:1 protection of MPLS Tunnel are correct (multiple choice)

Question83: Drift refers to the long-term phase change of the digital signal relative to the standard signal less than 10 Hz, and jitter refers to the short-term phase change of the digital signal relative to the standard signal greater than 10 Hz.

Question84: In the process of U2000 network management searching for paths, the path search management module first scans the cross-connections of each network element, constructs sub-paths based on the cross-connections of adjacent network elements, and tries to merge these sub-paths.Which of the following sub-paths are legal?

Question85: A network is configured with 1+1 protection on the board. On a certain day, the working channel has a condition that triggers protection switching, but the service cannot be automatically switched to the protection channel, resulting in service interruption.
The cause of the failure may be: (multiple choice)

Question86: The C-band 40-wave system is transformed into a C-band 80-wave system. The correct description is (multiple choice)

Question87: NG-SDH products initially support the board-level hot patch function. V100R008 starts to support both board-level hot patch and patch package functions (the hot patch upgrade method supported by different main control types is different), and it is supported from V100R010 and later versions.

Question88: What are the main application scenarios of 1588 ACR? (multiple choice)

Question89: What are the main modules of Huawei RTN 900 series equipment? (multiple choice)

Question90: When Huawei OTN and ZTE OTN equipment are connected, the ODU0 and ODU1 time slots of Huawei OTN equipment use sequential mode. Which statement is correct below (multiple choice)

Question91: What is wrong with the workflow of U2000 CORBA and OSS interconnection?

Question92: The GFP protocol has a high degree of standardization. It is a standard way for data services to be mapped to SDH/OTN. Which of the following features of the GFP protocol are correct? (multiple choice)

Question93: PTN equipment realizes the unified bearing of multiple services through PWE3. For users, the PTN equipment is equivalent to a Layer 2 switch at this time.

Question94: Synchronization means that signals maintain a certain strict specific relationship in frequency or phase, that is, their corresponding effective instants appear at the same average rate.

Question95: In the U2000 dual-system hot backup system, the active site fails and the standby site fails to start. Possible reasons () (multiple choice)

Question96: A network element cannot join the smart domain after the smart feature is enabled. The possible reasons are: (multiple choice)

Question97: NG-SDH equipment allocates ECC channel numbers according to certain principles. For example, by default, first insert a four optical port board in slot 4, the board will be assigned channel numbers 0, 1, 2, 3, and then insert an SL16 board in slot 2, then the board will be The assigned channel number is 4. If the SL16 board in slot 2 is unplugged at this time and a four optical port board is inserted in slot 8, what is the assigned channel number?

Question98: Which of the following descriptions of coherent technology is correct ()?

Question99: Which of the following abnormal conditions will trigger the TPS protection switching of the PTN equipment?

Question100: The maximum dispersion tolerance of an OTU board is 800ps/nm, so on G.652 fiber, the dispersion limited distance can be roughly considered as

Question101: If the OSN6800 device wants to achieve 1588V2 time synchronization, it must be configured with an electrical crossover board

Question102: In a certain wavelength division system project, the 1st-20th wave LSX is configured, and the M40 output port is tested with a spectrum analyzer during commissioning. It is found that the optical power of the 20th wave is significantly lower than that of the other 19 waves. The possible reason is (multiple choice)