Connection between switches and hosts, which port link type is often used by the switch?

At present, the company has a network administrator, and the AR2200 in the company network can be remotely managed by directly entering the password through Telnet. After the two new network administrators arrived, the company hopes to assign their own user names and passwords to all administrators, as well as different levels of authority. So how should it be done? Multiple choices

In which view can the administrator modify the device name for the router?

All ports on the root bridge switch are designated ports.

Which extension headers are supported by IPv6 packets? (Multiple choice)