A.An ABR is an OSPF router with links in two areas, connecting OSPF areas to the backbone

B.An ABR is an OSPF router that injects routing information from outside the OSPF AS

C.An ABR is an OSPF router with all of its links within an area

D.An ABR is an OSPF router with at least one link in a Layer 2 area

A.The BGP peering between R1 and R4 should use physical interface addresses

B.The BGP peering between R1 and R4 should use loopback interface addresses

C.The BGP peerings between R1, R2, and R3 should use physical interface addresses

D.The BGP peerings between R1, R2, and R3 should use loopback interface addresses

A.loopback address

B.primary transit interface address

C.all router addresses

D.all transit interfaces

A.You should configure commit synchronization.

B.You should configure the max period for NSR precision timers.

C.You must configure graceful restart.

D.You must configure GRES.

A.The system silently drops the packet

B.An ICMP message is sent to the source and the packet is forwarded

C.An ICMP message is sent to the source and the packet is dropped

D.The packet is forwarded and the packet is marked as rejected in the header