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What is the most likely reason for the dispartly between the actual network numbers at the branches and the routes in the routing table on Gateway-Router？（）

A.Branch-Router2 is configured to send both RIPv1 and RIPv2 updates.
B.Gateway-Router is configured to only receive RIPv2 updates.
C.Gateway-router is configured to receive only RIPv1 updates.
D.Branch-Router1 is configured to only send RIPv1 updates.

多项选择题

主机1试图与主机2通信，但是Router C上的E0接口关闭。以下哪项是正确的？（）

A.路由器C会使用ICMP通知Host1无法到达主机2。
B.路由器C会使用ICMP通知路由器B无法到达主机2。
C.路由器C会使用ICMP通知Host1，路由器A和路由器B无法到达主机2。
D.路由器C发送目的地不可达报文类型。
E.路由器C发送路由选择信息类型。
F.路由器C发送源抑制消息类型。