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Which of the following BGP packets will carry BGP Keychain authentication information?

BGP authentication can prevent illegal routers from establishing neighbors with BGP routers. BGP authentication can be divided into MD5 authentication and Keychain authentication.

Which of the following BGP packets will carry BGP Keychain authentication information? (Multiple Choice)
A . Update
B . Notification
C . Keeplive
D . Open

Answer: ABCD

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