单选题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？（）AIPBICMPCTCPDUDP
单选题
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？（）
A
IP
B
ICMP
C
TCP
D
UDP
参考解析
解析：
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