In a WDM system, using a dielectric thin film filter (TFF) is ideal when fewer than () wavelengths are used.

When LMSP is configured, there are two switching modes: single-ended switching and dual-ended switching. The protection protocol does not need to be enabled for single-ended switching.

Which of the following elements does a data communication network have in terms of equipment? (Multiple choice)

Which of the following statements about reuse is correct? In the process of byte interleaved multiplexing, the information payload and pointer bytes of each frame are interleaved and multiplexed according to the original value, and the segment overhead is also multiplexed accordingly.

MPLS is a label forwarding technology. Which of the following was its original design purpose?

If a bit error is detected in the B1 byte, which of the following alarms will be reported by the other end?

FAS is the frame alignment overhead, the length is 6 bytes, and it is located in the 1st to 6th columns of the first row. The 1st to 3rd bytes are 3 OA1 bytes, and each OA1 is always "1111 0110", that is, 16 F6 in hexadecimal; the 4th to 6th bytes are 3 OA2 bytes, and each OA2 is always "0010 1000", that is, 28 in hexadecimal.

The most effective subnet mask for a point-to-point WAN link is 255.255.255.252 .

Which of the following is correct for optical amplifiers and regenerators? (Multiple choice)

The communication network can be divided into local area network and wide area network according to the geographical scope it covers, and a metropolitan area network between the local area network and the wide area network. The wide area network is characterized by low delay, high data rate and reliable transmission.