Which of the following network element forms can complete the cross-multiplexing and service addition and subtraction between branches and lines, and between lines?

The LAN physical layer is often used for the interconnection of routers and switches. Although it is called a LAN, if a 10GBase-LR or -ER optical module is used, the transmission distance can reach 80 kilometers.

Which of the following is not a condition that triggers multiplexed segment protection (MSP)?

On the two-fiber bidirectional multiplex section protection ring, the first half of the VC-4 of each STM-N line is the working channel, and the second half of the VC-4 is the protection channel.

Which of the following statements about pointer adjustment are correct? (Multiple choice)