問答題

what does three entries of the diagram mean？ 給一張show ip bgp如下


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1.單項選擇題Unicast Reverse Path Forwarding can perform all of these actions except which one？（）

A.examine all packets received to make sure that the source addresses and source interfaces appear in the routing table and match the interfaces where the packets were received
B.check to see if any packet received at a router interface arrives on the best return path
C.combine with a configured ACL
D.log its events，if you specify the logging options for the ACL entries used by the unicast rpf command
E.inspect IP packets encapsulated in tunnels， such as GRE

2.單項選擇題Which of these statements accurately identifies how Unicast Reverse Path Forwarding can be employed to prevent the use of malformed or forged IP sources addresses？（）

A.It is applied only on the input interface of a router.
B.It is applied only on the output interface of a router.
C.It can be configured either on the input or output interface of a router.
D.It cannot be configured on a router interface.
E.It is configured under any routing protocol process.

4.多項選擇題Which two of these steps are minimum requirements to configure OSPFv3 under IPv6？（）

A.Configure a routing process using the command ipv6 router ospf [process-id].
B.Add the network statement for the interfaces on which OSPF will run.
C.Configure OSPF on the interface that it will run on.
D.Use the passive-interface command on the interfaces on which OSPF should not run.
E.Enable routing.

5.單項選擇題Two BGP peers connected through a routed firewall are unable to establish a peering relationship. What could be the most likely cause？（）

A.BGP peers must be Layer 2-adjacent.
B.EBGP multihop is not configured.
C.The firewall is not configured to allow IP protocol 89.
D.The firewall is not configured to allow UDP 179.