⚠️ Retired / Legacy Exam: This exam has been retired or replaced. These practice questions are kept for reference only. Please check the official vendor website for current exam versions before studying.
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