2. 计算机
  3. For security reasons, the network administrator needs to prevent pings into the corporate networks from hosts outside the intern

For security reasons, the network administrator needs to prevent pings into the corporate networks from hosts outside the intern

admin2019-04-08  2
问题 For security reasons, the network administrator needs to prevent pings into the corporate networks from hosts outside the internetwork． Which protocol should be blocked with access control lists?
选项 A、IP
B、ICMP
C、TCP
D、UDP
答案B
解析 PING命令 利用ICMP协议的echo,和 echo-replay两个报文来检测链路是否连通的。所以如果要阻止PING的流量到网络，就只要过滤掉ICMP的应用就可以了。
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