The multi-level defense system is mainly reflected in the network level and the system level. Which of the following options are used for security defense at the network level? (Multiple choice)

User access authentication technology does not include which of the following options?

Portal authentication on the Agile Controller-Campus has been configured and is correct.
Configure the following commands on the access control switch:
[S5720] authentication free-rule 1 destination ip 10.1.31.78 mask 255.255. 255.255 Which of the following options are correct? (multiple choice)

Identity authentication determines whether to allow access by identifying the identity of the access device or user.

Accordingto the different user name format and content used by the access device to verify user identity, the user name format used for MAC authentication can be changed.
There are three types. Which of the following formats is not included?