A.[Router-rip-1]undo summary
B.[Router-rip-1]undo auto-summary
C.[Router-Serial1/0]undo summary
D.[Router-Serial1/0]undo auto-summary

A.172.16.0.0/22
B.172.16.0.0/23
C.172.16.0.0/24
D.172.16.0.0/25

A.[Router]rip preference 60
B.R[outer]preference 60
C.[Router-rip-1]rip preference 60
D.[Router-rip-1]preference 60

A.[Router]ospf preference 100
B.R[outer]preference 100
C.[Router-ospf-1]ospf preference 100
D.[Router-ospf-1]preference 100

A.[Router]ospf preference 60
B.[Router]preference 60
C.[Router-ospf-1]ospf preference 60
D.[Router-ospf-1]preference 60

A.RIP-1
B.RIP-2
C.OSPF
D.BGP

A.10
B.100
C.150
D.255

A.10
B.100
C.150
D.255

A.向1.0.0.1转发
B.向1.0.0.2转发
C.同时向1.0.0.1和1.0.0.2转发
D.无法判断

A.BGP，OSPF
B.OSPF，BGP
C.RIP，RIP
D.IS-IS，IS-IS

A.30秒后，RTA认为邻居失效，并删除从RTB学来的路由
B.90秒后，RTA认为邻居失效，并删除从RTB学来的路由
C.120秒后，RTA认为邻居失效，并删除从RTB学来的路由
D.180秒后，RTA认为邻居失效，并删除从RTB学来的路由