多项选择题
A.RouterC会使用ICMP通知Host1&ldquo；Host2无法到达&rdquo；
B.RouterC会使用ICMP通知Host1&ldquo；Host1无法到达&rdquo；
C.RouterC会使用ICMP通知Host1，RouterA和RouterB&ldquo；Host2无法到达&rdquo；
D.RouterC会发送一个&ldquo；DestinationUnreachable&rdquo；的消息类型
E.RouterC会发送一个&ldquo；RouterSelection&rdquo；的消息类型
F.RouterC会发送一个&ldquo；SourceQuench&rdquo；的消息类型
单项选择题 How many subnets can be gained by subnetting 172.17.32.0/23 into a /27 mask, and how many usable host addresses will there be per subnet?（）
单项选择题 As a network administrator，you have been instructed to prevent all traffic or iginating on the LAN from entering the R2 router.Which the following command would implement the access list on the interface of theR2 router？（）
单项选择题 S0/0 on R1 is configured as a multipoint interface to communicate with R2 and R3 in the hub-and-spoke Frame Relay topology shown in the exhibit. Originally, static routes were configured between these routers to successfully route traffic between the attached networks. What will need to be done in order to use RIPv2 in place of the static routes?（）
