单项选择题
A. Route reflectors are not passing updates properly.
B. BGP synchronization has been enabled.
C. The next-hop address is unreachable.
D. No loopback interface has been configured on a router.
单项选择题 Which Cisco IOS command is used to troubleshoot a problem in which a BGP session stays in the active state?（）
单项选择题 Which command is used to view IPv6 parameters related to the BGP process?（）
单项选择题 Which keyword is used with the show ip bgp neighbors [keyword] command to display all routes that are received and accepted from a neighbor?（）