A. Before being acquainted with EBGP network, or before being localized or routed.

B. Previously passed other IBGP EBGP neighbors, or formerly learned from the neighboring habits, or the
previous introduction of the routing

C. Previously passed other BGF network neighbors, or previously localized or routed to learn

D. The former is the EBGP RR neighbors, or the previous ones

E. Presences existing in routing shows

A. Except for virtual links, all OSPFv3 interfaces use a link-local address as the destination address of OSPFv3 message.

B. Two OSPF routers on the same physical link can still establish a neighbor relationship even if no unicast IPv6 address is configured.

C. When an OSPFv3 router obtains routing information from a neighbor, it uses the link-local address of the neighbor as the next hop for packet forwarding.

D. Two OSPF routers on the same physical link can still establish a neighbor relationship even if their IPv6 addresses are on different networks.

A. Upon receiving a topology change notification

B. When transitioning from discarding to forwarding

C. Only when changing from listening to discarding

D. Upon a port state change

E. When transitioning from forwarding to discarding

A. If some devices from other vendors are deployed on the network and these devices do not support the IS-IS LSP fragment extension function, the fragment extension mode must be set to Mode-1; otherwise, the devices from other vendors cannot identify the packets.

B. After the IS-IS LSP fragment extension function is enabled, the IS-IS process does not need to be restarted.

C. IS-IS can choose whether to authenticate and verify the received SNP and LSP packets.

D. If the link state PDUs to be advertised by IS-IS contain a lot of information, the IS-IS router generates more LSP fragments to carry more IS-IS information.

A. Route-Policy node " " node Route-Policy's relationship is inter-filter or , that is, as long as it passes a filter, it can pass.

B. When the BGP BGP BGP pair is received, the routing policy is executed, and the unwanted routing routes are not added to the local.Routing table

C. Configure a routing policy for routes originating in the local area. The policy is effective before adding routes to the routing table.

D. Route-Policy node if-match " " In the same one, multiple attributes of different attributes are.