Regarding the description of the encapsulation format of labels in MPLS, the correct one is

Which of the following statements about LDP label retention-free way is correct? (Multiple choice)

In the process of daily troubleshooting, engineers may need to check some alarm information of the device.
Turn on the debugging/log/alarm information sent by the terminal display information center by executing the terminal () command.
(Please use English lowercase letters to complete the command, and the command cannot be abbreviated)

What is the purpose of configuring LSP fragmentation on an IS-IS device?

BGP routing policies can control the advertisement and reception of routes.