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Router(config)#access-fist 100 permit icmp 215.192.40.16 255.255.255.240 any Router(config)#access-list 100 permit icmp 202.204.28.0 255.255.255.0 any Router(config)#access-list 100 deny icmp any any Router(config)#access-list 1 00 permit ip any any Router(config)# Router(config)#access-list 98 permit icmp 215.192.40.16 0.0.0.15 any Router(config)#access-list 98 permit icmp 202.204.28.0 0.0.0.255 any Router(config)#access-]ist 98 deny icmp any any Router(config)#access-list 98 permit ip any any Router(config)# Router(config)#access-1ist 198 permit icmp 215.192.40.16 0.0.0.15 any Router(config)#access-list 198 permit icmp 202.204.28.0 0.0.0.255 any Router(config)#access-list 198 deny icmp any any Router(config)#access-list 198 permit ip any any
access-list 90 deny icmp 168.27.95.0 255.255.255.0 any access-list 90 deny icmp any any access-list 90 permit ip any any access-list 100 permit icmp 168.27.95.0 0.0.0.255 any access-list 100 permit ip any any access-list 110 permit icmp 168.27.95.0 255.255.255.0 any access-list 110 deny icmp any any access-list 120 permit icmp 168.27.95.0 0.0.0.255 any access-list 120 deny icmp any any access-list 120 permit ip any any
access-list 198 permit icmp 166.129.130.0 255.255.255.0 any access-list 198 deny icmp any any access-1ist 198 permit ip any any access-list 198 permit icmp 166.129.130.0 0.0.0.255 any access-list 198 deny icmp any any access-list 198 permit ip any any access-list 99 permit icmp 166.129.130.0 0.0.0.255 any access-list 99 deny icmp any any access-list 99 permit ip any any access-list 100 permit icmp 166.129.130.0 0.0.0.255 any access-list 100 permit ip any any access-list 100 deny icmp any any
Router(config)#access-list 100 permit icmp 215.192.40.16 255.255.255.240 any Router(config)#access-list 100 permit icmp 202.204.28.0 255.255.255.0 any Router(config)#aceess-list 100 deny icmp any any Router(config)#access-list 100 permit ip any any Router(config)# Router(config)#access-list 98 permit icmp 215.192.40.16 0.0.0.15 any Router(config)#access-list 98 permit icmp 202.204.28.0 0.0.0.255 any Router(config)#access-list 98 deny icmp any any Router(config)#access-list 98 permit ip any any Router(config)# Router(config)#access-list 198 permit icmp 215.192.40.16 0.0.0.15 any Router(config)#access-list 198 permit icmp 202.204.28.0 0.0.0.255 any Router(config)#access-list 198 deny icmp any any Router(config)#access—list 198 permit ip any any
access-list 198permit icmp 166.129.130.0 255.255.255.0 anyaccess-list 198 deny icmp any any
access-list 1 98 permit ip any any access-list 198 permit icrnp 166.129.130.0 0.0.0 255 anyaccess-list 198 deny icmp any any
access-list 198 permit ip any any access-list 99 permit icrnp 166.129.130.0 0.0.0 255 any
access-list 9 9 deny icrnp any any
access-list 99 permit ip any any access-list 100 permit icrnp 166.129.130.0 0.0.0 255 any
access-list 100 permit ip any any
access-list 1 00 deny icmp any any
access-list 198 permit icmp 166.129.130.0 255.255.255.0 any access-list 198 deny icmp any any access-list 198 permit ip any any access-list 198 permit icmp 166.129.130.0 0.0.0.255 any access-list 198 deny icmp any any access-list 198 permit ip any any access-list 99 permit icmp 166.129.130:0 0.0.0.255 any access-list 99 deny icnip any any access-list 99 permit ip any any access-list 100 permit icmp 166.129.130.0 0.0.0.255 any access-list 100 permit ip any any access-list 100 deny icmp any any
access-list 120 deny icmp 159.67.183.0 0.0.0.255 any access-list 120 permit ip any any access-list 10 permit icmp 159.67.183.0 0.0.0.255 any access-list 10 deny icmp any any access-list 10 permit ip any any access-list 99 permit icmp 159.67.183.0 0.0.0.255 any access-list 99 deny icmp any any access-list 110 permit icmp 159.67.183.0 0.0.0.255 any access-list 110 deny icmp any any access-list 110 permit ip any any
Router rconfig)#access-list 98 permit icmp 215.192.40.16 0.0.0.15 any Router(config)#access-list 98 permit icmp 202.204.28.0 0.0.0.255 any Router(config)#access-list 98 deny icmp any any Router(config)#access-list 98 permit ip any any Router(config)# Router(config)#access-list 198 permit icmp 215.192.40.16 0.0.0.15 any Router(config)#access-list 198 permit icmp 202.204.28.0 0.0.0.255 any Router(config)#access-list 198 permit ip any any Router(config)#access-list 198 deny icmp any any Router(config)# Router(config)#access-list 198 permit icmp 215.192.40.16 0.0.0.15 any Router(config)#access-list 198 permit icmp 202.204.28.0 0.0.0.255 any Router(config)#access-list 198 deny icmp any any Router(config)#access-list 198 permit ip any any
路由器向IP报文的源地址发送一个ICMP错误信息，并继续转发该报文 路由器向IP报文的源地址发送一个ICMP错误信息，并停止转发该报文 路由器继续转发报文，不发送错误信息 路由器直接丢弃该IP报文，既不转发，也不发送错误信息
access-list 120 deny icmp 159.67.183.0 0.0.0.255 any access-list 120 permit ip any any access-list 10 permit icmp 159.67.183.0 0.0.0.255 any access-list 10 deny icmp any any access-list 10 permit ip any any access-list 99 permit icmp 159.67.183.0 0.0.0.255 any access-list 99 deny icmp any any access-list 110 permit icmp 159.67.183.0 0.0.0.255 any access-list 110 deny icmp any any access-list 110 permit ip any any
ICMP封装在IP数据报的数据部分 ICMP是属于应用层的协议 ICMP是IP协议的必需的一个部分 ICMP可用来进行拥塞控制
路由器向 IP报文的源地址发送一个 ICMP错误信息，并继续转发该报文 路由器向 IP报文的源地址发送一个 ICMP错误信息，并停止转发该报文 路由器继续转发报文，不发送错误信息 以上四种说法都不完全正确，要视具体情况而定
access-list 198 permit icmp 166.129.130.0 255.255.255.0 any access-list 198 deny icmp any any access-list 198 permit ip any any access-list 198 permit icmp 166.129.130.0 0.0.0.255 any access-list 198 deny icmp any any access-list 198 permit ip any any access-list 99 permit icmp 166.129.130:0 0.0.0.255 any access-list 99 deny icnip any any access-list 99 permit ip any any access-list 100 permit icmp 166.129.130.0 0.0.0.255 any access-list 100 permit ip any any access-list 100 deny icmp any any
Router(config)#access-list 110 permit icmp 212.78.170.166 0.0.0.0 any Router(config)#access-list 110 deny icmp any any Router(config)#access-list 110 permit ip any any Router(config)#access-list 110 permit icmp 212.78.170.0 255.255.255.224 any Router(config)#access-list 110 permit ip any any Router(config)#access-list 110 deny icmp any any Router(config)#access-list 110 permit icmp 212.78.170.0 0.0.0.255 any Router(config)#access-list 110 deny icmp any any Router(config)#access-list 110 permit ip any any Router(config)#access-list 110 permit icmp 212.78.170。160 0.0.0.31 any Router(config)#access-list 110 deny icmp any any Router(config)#access-list 110 permit ip any any
以上四种说法都不完全正确，要视具体情况而定 路由器向IP报文的源地址发送一个ICMP错误信息，并停止转发该报文 路由器向IP报文的源地址发送一个ICMP错误信息，并继续转发该报文 路由器直接丢弃该IP报文，既不转发，也不发送错误信息 路由器继续转发报文，不发送错误信息
不允许任何ICMP消息 允许所有ICMP消息 只允许传入的echo请求 不允许传入的echo请求
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