R1, R2, R3, and R4 run OSPF. The area IDs are shown in the figure. Please match the LSA types and area IDs in each area.

Which of the following descriptions about BGP route aggregation is wrong?

When a router running IS-IS finds that the LSDB is out of sync, what kind of message will it send to request its neighbors to send a new LSP?

You use a Huawei router as an SSH client to log in to another Huawei router, but the login fails. You suspect that it may be a configuration error on the SSH server side. When checking the cause of the server configuration failure, which of the following items is the most impossible?

Which of the following options are used to remind customers of information security? (Multiple choice)