Which of the following protocols needs to be denied?

Posted by: Pdfprep Category: CS0-001 Tags: , ,

A network technician is concerned that an attacker is attempting to penetrate the network, and wants to set a rule on the firewall to prevent the attacker from learning which IP addresses are valid on the network.

Which of the following protocols needs to be denied?
A . TCP
B . SMTP
C . ICMP
D . ARP

Answer: C

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