NO.61 SF is a signal failure event and SD is a signal degradation event. Both the SF and SD events are conditions for triggering protection switching, but whether the SD time is used as a trigger switching condition can be set by the user.

• A. TRUE
• B. FALSE

NO.62 The basic principles of STP device fault location are? (Multiple choice)

• A. First advanced, then low level
• B. First low speed, then high speed
• C. First external, then transfer
• D. First network, then network element

NO.63 The OSN 8800 device is protected by fan redundancy. When any fan in the fan box is broken, the system can still operate normally for a long time.

• A. TRUE
• B. FALSE

NO.64 The ROADM site using WSMD9 board can support up to 9 dimensions. If it exceeds 9 dimensions, it can be implemented by cascading WSMD9 boards.

• A. TRUE
• B. FALSE

NO.65 Path method creates OCh failure, what are the possible reasons? (Multiple Choice)

• A. There are still unremoved alarms in the boards involved in OCh.
• B. Inconsistent wavelength setting at both ends of source and sink
• C. No service layer path
• D. Some pigtails are not connected

NO.66 Which of the following description of discrete services is correct? (Multiple Choice)

• A. For the cross-connections, after a path search, either a discrete service or forming a path with other cross-connections, which is impossible to be a discrete service, and forming a path with other cross-connections.
• B. Perform path search on the U2000 network management. Cross-connections that do not form a path are called high-bandwidth 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 NE side.

NO.67 In WDM transmission systems, the main factors affecting the unevenness of power balance of each channel which are not included? (Multiple choice)

• A. Non-uniformity of insertion loss of each channel of the multiplexer/demultiplexer
• B. The main channel dimming fader setting is unreasonable
• C. Cable aging is high
• D. EDFA gain unevenness

NO.68 Which of the following is the incorrect description of the internal port properties of the Ethernet board?

• A. For the ingress port for the Access attribute, if the input data carries the VLAN ID, discard.
• B. For the inbound port of the Tag Aware attribute, if the input data carries the VLAN ID, transparently receive the data.
• C. For the ingress port of the Access attribute, if the input data does not carry the VLAN ID, it is directly transparent.
• D. For the ingress port of the Tag Aware attribute, if the input data does not carry the VLAN ID, discard.

NO.69 NS4 as 100G line service processing board. In the following description of the NS4 board, which is wrong?

• A. The wavelength of the wavelength division side optical signal is adjustable within 80 waves of the C-band 50 GHz interval.
• B. The MS4 board does not support the intersection of ODUI services with the ND2 board through the centralized crossover bus.
• C. Support 80-way ODU0/ODUflex or 40-way ODU1 or 10-way ODU2/ODU2e or 2-way ODU3 or 1-way ODU4 signal and cross-board to realize service cross-scheduling.
• D. It can be used in electrical relay stations to realize the electrical relay function of the corresponding optical signals.

NO.70 MG-SDH digital single core can be expanded by software upgrade.

• A. True
• B. False

NO.71 The OTS path refers to the physical fiber connection between two adjacent OM/OD/OA on the main optical path.

• A. TRUE
• B. FALSE

NO.72 The length range of the DATA field in the Ethernet frame structure is ().

• A. 46-1500 bytes
• B. 46-1518 bytes
• C. 64-1518 bytes
• D. 64-1500 bytes

NO.73 When you configure the Layer 2 attribute of the Ethernet, you need to set the Default VLAN ID and VLAN Priority of the untagged frame when the TAC ID is set to Access or Hybrid.

• A. TRUE
• B. FALSE

NO.74 Which of the following is not a part of the ASON Control Protocol?

• A. LMP
• B. RSVP-TE
• C. IS-IS
• D. OSPF-TE

NO.75 The following description of the ASDN software structure, the correct ones are: (Multiple Choice)

• A. Intelligent optical network consists of three planes
• B. The management plane mainly refers to upper management such as network management.
• C. Intelligent software main application management plane
• D. The transmission plane refers to the traditional transmission network.