EMT Practice Test

1. Question Content...

---

Question1: OSN6800 reports the commun_fail alarm from the SCC board of subrack 2, the third digit of the parameter is 0X04, the network element is not disconnected, and the master subrack and slave subrack 1 have no abnormal alarms. The possible cause of the failure is (multiple choice)

Question2: What are the possible reasons for reporting BUS_ERR among the following options (multiple choices)

Question3: The type of software to be loaded in the OSN product upgrade process includes the basic BIOS. Then, what are the main functions of the basic BIOS? (multiple choice)

Question4: Reasons why it is impossible to frequently disconnect OTN equipment network elements

Question5: The following clock networking optimizations are wrong:

Question6: In the Linux system, the directory tree structure and the file system are two different concepts. The file system is the logical way of managing files in the operating system, and the directory tree structure is the physical storage method of files on the disk or partition.

Question7: 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.

Question8: If an NE is found on the U2000 network management to report an alarm of "NE is in a safe state", the operations that are not allowed on the U2000 are

Question9: 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)

Question10: Regarding the 10G/100G mixed transmission wavelength isolation band, is the following statement wrong? ()

Question11: 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?

Question12: On the U2000 network management, the packet plane and TDM plane in the Hybrid MSTP device can be managed uniformly to achieve end-to-end service intercommunication.

Question13: In order to achieve the specified synchronization quality requirements, corresponding requirements must be made for the synchronization transmission network, and certain networking rules must be followed during network planning. Which of the following is wrong?

Question14: In the SDH network, the S1 byte is used to transmit synchronization status information. Which of the following S1 byte values represents the G.811 recommended clock?

Question15: 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.

Question16: 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

Question17: In the network, clock equipment is usually used to ensure network synchronization, and different clock sources are selected according to the requirements of different clock accuracy. If you want to meet the clock accuracy of G.811, which clock source can you choose? (multiple choice)

Question18: The LPT (Link Pass Through) function is used in scenarios where WDM equipment accesses FE/GE/10GE LAN services. The correct statement about LPT is: (multiple choice)

Question19: 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?

Question20: In general, which PHB is the signaling flag?

Question21: As shown in the figure, in the business configuration of the PP ring belt chain, discrete services are generated due to incomplete or incorrect configuration. In order to solve this discrete service, the service configuration needs to be supplemented. Which of the following steps are correct? (More select)

Question22: An organization has built a network with 20 subnets and class C IP addresses. What is the subnet mask that should be used to configure the network correctly?

Question23: The reason why the ODUk_PM_OCI alarm statement is correct (multiple choice)

Question24: 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?

Question25: 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)

Question26: For ODUk ring network protection, the following statement is wrong:

Question27: The following is the network parameter planning of an engineer's network management server, the correct one is (multiple choice)

Question28: #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?

Question29: OptiX OSN 1800 is a compact multi-service optical transport platform. What is wrong in the following description? ()

Question30: Which of the following are the functions of MPLS-TP OAM? (multiple choice)

Question31: Which of the following features does the N3EFS4 board support? (multiple choice)

Question32: The following is wrong about the position of the dispersion module in the signal flow.

Question33: 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.

Question34: The following are the parts of the CORBA northbound interface and the corresponding functions of each part. Which is correct?

Question35: What is correct about traffic policing and traffic shaping?

Question36: OSN6800 single-master network element master control failure, after replacing the master control, what operations need to be performed (multiple choice)

Question37: The following description of cluster management, the error is ()

Question38: The TN13FIU board does not support optical power detection, but supports reporting MUT_LOS alarms through alarm synthesis

Question39: Regarding the optical power commissioning of the RAU2 board, which of the following options is correct () (multiple choice)

Question40: XPIC can be used in conjunction with ATPC, but it is generally not recommended.
If it needs to be used together, what should be paid attention to? (multiple choice)

Question41: 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?

Question42: 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.

Question43: The WDM optical layer ASON DCC D4-D12 setting pass-through has no effect on ASON

Question44: 172.17.15.0/28 When dividing subnets, which of the following addresses are legal subnet addresses (multiple choice)

Question45: 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.

Question46: Which of the following descriptions of ODUk SNCP protection types are wrong?

Question47: In the actual deployment of 1588v2, you will encounter asymmetry in the length of the transceiver fiber. What are the main solutions for fiber asymmetry in the industry? (multiple choice)

Question48: The following description of OLP optical line protection is wrong:

Question49: Suppose there are subnets A1, A2, and A3 under subnet A.
When configuring monitoring settings, if subnets A1, A2, and A3 are not all selected for monitoring, subnet A will not be monitored.
If a new subnet A4 is added under subnet A, the newly added subnet A4 will be monitored only when subnet A is monitored, and the monitoring strategy can be different from the monitoring strategy of subnet A.

Question50: The following statements about the main and backup channels of optical line protection are wrong:

Question51: Regarding the description of OSS, what is wrong is

Question52: The following steps add pointers

Question53: U2000-managed dual-machine software Veritas needs to apply for a license, one for the main and standby machines, and import them after activation. The licenses for the main and standby machines are different. For the U2000 license, you also need to activate it with their own ESNs and import them separately. The ESNs of the licenses of the active and standby machines are different.

Question54: The networking of a certain wavelength division network is shown in the figure.

Now due to the needs of new business, there are 2 waves that need to be up and down at site B, that is, the OLA site needs to be transformed into a back-to-back OTM site. The error described below is

Question55: What are the limiting factors of CES ACR synchronization? (multiple choice)

Question56: The following statement is correct () (multiple choice)

Question57: MSTP equipment TDM plane can support 1588V2

Question58: The non-linear effect of the coherent signal is stronger than that of the 10G non-coherent, so the single-wave entering fiber optical power should be reduced. Therefore, during system commissioning, the OA gain can be reduced to reduce the single-wave output optical power of the OA to meet the fiber-in optical power requirements.

Question59: Which of the following descriptions about the client-side 1+1 protection features is wrong?

Question60: In the network management planning process, which item is not completely necessary?

Question61: The OTU2 frame length is approximately four times the OTU1 frame length

Question62: In the U2000 dual-system hot backup system, the active site fails and the standby site fails to start. Possible reasons () (multiple choice)

Question63: In the test item of IEEE 1588V2 time protection function, what is wrong?

Question64: Because the Ethernet port OAM acts on the last kilometer and is used for the Ethernet link between two devices, the protocol stipulates that the message cannot be forwarded by the bridge.

Question65: If the meter sending data frame rate is X and receiving data frame rate is Y, then the packet loss rate = (XY) /X*100%, usually the packet loss rate + throughput = 1

Question66: 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?

Question67: When configuring the dual-stage amplifier board of RAU+OAU, which position of the DCM module is recommended in the following figure is the best

Question68: SPC (Software Permanent Connection). It is the business connection between PC and SC. The user to the network part is directly configured by the network management management plane, and the connection of the network part is initiated by the network management management plane to the ingress network element control plane, which is completed by the ingress network element control plane through signaling

Question69: The IP address you use is 165.247.52.119, and the subnet mask is 255.255.240.0. Which subnet is your host?

Question70: What should I pay attention to when swapping antennas? (multiple choices)

Question71: 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?

Question72: Hybrid MSTP devices support cross-domain clock intercommunication, and support the intercommunication of synchronous Ethernet and SDH synchronization.

Question73: In the Ethernet service OAM, the name of the node that can initiate the OAM operation is

Question74: 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.

Question75: The following descriptions about 1+1 protection and 1:1 protection of MPLS Tunnel are correct (multiple choice)

Question76: Which of the following are the background reasons for the introduction of coherent communication ()? (multiple choice)

Question77: When planning a 1+1 HSB, the corresponding planning principles should be followed. Which of the following are not HSB planning principles?

Question78: Regarding the OTN system network-level protection switching test, is the following statement wrong? ()

Question79: The main difference between SNCP and PP ring is that SNCP adopts tributary board selective reception while PP adopts cross board selective reception.

Question80: An ETH_LOS or LINK_ERR alarm occurs on a single Ethernet port of a multi-interface Ethernet board, and the service is interrupted.The possible reasons are: the working mode of the Ethernet port is not matched or the interface rate is inconsistent, the optical module hardware is faulty, and the possible reasons are?

Question81: When the EX2 board of the PTN equipment is connected to the STM-64 port, how should the working mode of the interface be set?

Question82: 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 ()

Question83: 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

Question84: Which of the following is the error about the optical power commissioning?

Question85: The 1588V2 clock enters the non-tracking working mode, and the alarm CLOCK_NO_TRACE_MODE is reported. What is the possible reason?

Question86: 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

Question87: Which of the following statements about PTN equipment Tunnel APS, PW APS, LMSP (1:N) protection is incorrect?

Question88: The following statement about PTN's VPLS technology is wrong,

Question89: The C-band 40-wave system is transformed into a C-band 80-wave system. The correct description is (multiple choice)

Question90: An operator needs to configure 60 clients, 200 OptiX PTN 1900, 100 OptiX OSN 3800 (With ASON), 150 NE40E, 200 CX600 series equipment, and the access side is equipped with FTTx OLT and MDU, a total of 80,000 xDSL lines , 70,000 lines of PSTN ports, 30 OLTs and 300 MDU devices are deployed.
Regarding the description of this network, the error is:

Question91: For WDM network, the following description is correct (multiple choice)

Question92: The test frame is a data message used to test the network connection status of the Ethernet service. Regarding the application of the OTN equipment test frame, which of the following statements is correct? () (multiple choice)

Question93: Designed as a C-band 80-wave system, add the operation of the C-band odd-numbered wave, the description is correct (multiple choice)

Question94: What should be paid attention to when planning a 1588V2 network?

Question95: Which of the following is not an antenna parameter?

Question96: When spreading the existing network WDM system, there is no need to evaluate which of the following performances

Question97: The following are not precautions for preliminary testing:

Question98: The ring network of the OSN6800 equipment group was newly opened, and ODU1-SNCP/N protection was enabled. The engineer reported that a switch occurred one day and has not been restored, but there is no problem with the optical cable. There is an ODU_SNCP_PS alarm on the corresponding ND2 optical port. The possible reasons are:

Question99: The sequence of downstream signals flowing through the functional blocks of the SL16 circuit board is

Question100: Compared with traditional MPLS, what are the improvements of MPLS-TP? (multiple choice)

Question101: Which of the following descriptions of the networking requirements for configuring SOM is wrong ()?

Question102: According to the requirements, before OTN 6800/8800 equipment is upgraded, it is necessary to return the network element health check file to TAC analysis

Question103: Which of the following reasons will form discrete services on network management?

Question104: For the 1+1 protection in the OTU board of the external OLP, it supports two kinds of non-extended mode and extended mode. The extended mode increases the switching conditions of the electrical layer.

Question105: In the process of creating an upgrade task, the following statement is wrong

Question106: For back-to-back OTM sites, three new relay wavelengths are added. The schematic diagram is as follows. The following statement is wrong

Question107: The reason for reporting the BEFFEC_EXC alarm is that the following statement is wrong

Question108: For inter-board wavelength protection and client-side 1+1 wavelength protection, it is forbidden to manually set the "laser status" of the backup OTU client-side optical interface to "on", otherwise the service will be interrupted.

Question109: 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

Question110: 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 ()?