在部署GLBP的时候首先注意什么？

ipv6 Solicited-Node Multicast Address有什么作用，2个作用只要说出一个？

what is machinery of aaa configure？

一个启用VTP pruning的交换网络，有几台透明模式的交换机要加入，请问你如何避免不稳定性avoid instability？

clear ip bgp * soft会让路由器引发什么？

Which of these statements about PIM join messages in classic PIM-SM is correct？（）

A. PIM join messages are sent every 60 seconds to refresh the upstream router’s mroute state for the multicast tree.
B. Routers send a PIM join acknowledgement in response to each PIM join message received from a downstream router.
C. PIM join messages are only sent when the multicast distribution tree is first being established.
D. PIM join messages are sent every three minutes to refresh the upstream router’s mroute state for the multicast tree.

问有哪些路由协议在路由条目发生变化时只做部分更新，并且使用比较低的链路带宽？

what kind of message in GLBP will inform other membership of GLBP learn virtual mac-address.

Which statement correctly describes the disabling of IP TTL propagation in an MPLS network？（）

A. The TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSR
B. TTL propagation cannot be disabled in an MPLS domain
C. TTL propagation is only disabled on the ingress edge LSR
D. The TTL field of the MPLS label header is set to 255
E. The TTL field of the IP packet is set to 0

You are subneting in the network， out of network address，what’s feature can add one more address？