NO.31 The OD system monitors the main optical path performance in each optical multiplexing section (OMS),which of the following items are monitored?

• A. whether a fiber cut occurs on the main optical path.
• B. whether the optical power of the transmit-end OA board is out of the permitted range.
• C. whether the line loss compensation is out of the permitted range.
• D. whether the line loss exceeds the design end of life (EOL) value

NO.32 Which of the following application scenarios that belong to the change configuration method? (Multiple choice)

• A. In the upgrade and expansion, if you suspect that the new configuration is faulty, you can re-issue the original configuration to locate the configuration problem.
• B. If you suspect that there is a problem with a slot, you can exclude it by changing the board configuration.
• C. If you suspect that there are problems with certain channels or one of the tributary boards of the tributary board, you can change the time barrier configuration to configure the service to another channel or to another tributary board.
• D. If you suspect that there is a problem with one VC-4, you can adjust the time barrier to another VC-4.

NO.33 The following description of the 1+1 protection in the board, the correct ones are: (Multiple Choice)

• A. The 1+1 protection on the board can protect the OTU board.
• B. Set the OTU as the detection unit, and the electrical layer alarms such as OTUk_LOF and OTUK_LOM will also trigger the switching.
• C. For OSN 1800 devices, you can use the OTU with dual-selection to protect your business.
• D. In-board 1+1 protection can be applied to chain networking and ring networking.

NO.34 If the tunnel APS is configured for the tunnel to which the PW belongs, the PW cannot be configured with the PW APS.

• A. TRUE
• B. FALSE

NO.35 When creating a Client path using the path method, if the RL0S alarm is generated on the line card, the path cannot be created.

• A. TRUE
• B. FALSE

NO.36 A, C are the WDM OTM stations, and B is the relay station. When the transmission direction of the A to B stations is interrupted, the Wavelength side of the B-stack OTU relay board reports the R_LOS emergency alarm and runs the processing to the upstream A. The station side OTU2_BDI secondary alarm. At the same time, the alarm continues to be transmitted to the downstream station of the B station. After the alarm is processed at the C site, the ODU2_PM_AIS minor alarm is reported on the WDM side of the C-site OTU, and the ODU2_PM_BDI secondary alarm is transmitted back to the upstream station A.

• A. TRUE
• B. FALSE

NO.37 What are the common test indicators for Ethernet services? (Multiple Choice)

• A. Frame loss rate
• B. Delay
• C. Throughput
• D. Back to back

NO.38 During the configuration of the E-LAN, the "MAC Address Learning Mode" can be set to SVL and IVL. SVL is a stand-alone VLAN learning, and IVL is a shared VLAN learning.

• A. TRUE
• B. FALSE

NO.39 Which of the following is the data that needs to be collected and saved in the event of a failure? (Multiple Choice)

• A. Equipment alarms and performance events
• B. Running status data of the NE and the board
• C. Operation log of the network management
• D. Configuration data for network elements and boards

NO.40 Which of the following reasons does not cause optical power anomalies?

• A. Enable FEC function
• B. Pigtail connection error
• C. Equipment temperature is too high
• D. The pigtail is too large

NO.41 The following description of discrete services, which are correct? (Multiple choice)

• A. For a cross-connection, after the path search, it is either a discrete service or a path with other cross-connections, it is impossible to belong to both high-spread services and other crossconnections to form a path.
• B. Perform path search on the U2000 network management. Cross-connections that do not form a path are called discrete services.
• C. Discrete service management requires the U2000 license to have path management functions.
• D. A service is searched for a discrete service, indicating that the service is not working properly on the network element side.

NO.42 In the sub-(wave) characterization test, what kind of standard does the isolation test require?

• A. < 20dB
• B. < 25dB
• C. > 20dB
• D. > 25dB

NO.43 Which of the following tools may Board replacement use? (Multiple choice)

• A. Shielding bag
• B. Anti-static gloves
• C. Fiber extractor
• D. U2000

NO.44 The following description of the operation of the device, the error is:

• A. Wear an ESD-preventive wrist strap or gloves to prevent static electricity from damaging the board.
• B. CLASS 1M means low optical power, no damage to eyes or skin
• C. Regularly clean the air filter to facilitate heat dissipation
• D. Equipment needs safety grounding

NO.45 Which step is more when the the single board replacement operation of main control board single configuration than main control board double configuration?

• A. Download the original configuration data
• B. Ensure that the version of the host software is the same before and after the replacement.
• C. Consistency check of network management and network element data.
• D. Query the alarm of the board and confirm that the original alarm has been cleared.