单项选择题
A. Open
B. Active
C. Update
D. Keepalive
多项选择题 Which three BGP states follow the successful completion of the underlying TCP connectivity? （）(Choose three.)
多项选择题 Which three BGP states are associated with establishing TCP connectivity?（） (Choose three.)
单项选择题 Which configuration command establishes an EBGP session to a peer in AS 300?（）