NS4 as 100G line service processing board. In the following description of the NS4 board, which is wrong?

• A.The MS4 board does not support the intersection of ODUI services with the ND2 board through the centralized crossover bus.
• B.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.
• C.It can be used in electrical relay stations to realize the electrical relay function of the corresponding optical signals.
• D.The wavelength of the wavelength division side optical signal is adjustable within 80 waves of the C-band 50 GHz interval.

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Which of the following boards can be inserted on the OSN 9800 U64 subrack?

• A.TNV1N401
• B.TN18LSC
• C.TN54GS4
• D.TNF 5UNQ2

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The length range of the DATA field in the Ethernet frame structure is ().

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

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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.

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The basic principles of STP device fault location are? (Multiple choice)

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

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