GCIA: GIAC Certified Intrusion AnalystDemo

By GIAC · Question Mode

QuestionQ26

UDP and ICMP

You are a Network Administrator for TechPerfect Inc. The company has a corporate intranet configuration. A router on the network connects outside hosts to the internetwork. For security, you need to prevent outside hosts from pinging hosts on the internetwork. Which step should you take to accomplish this task?

  • A Block the ICMP protocol through ACL.
  • B Block the IPv6 protocol through ACL.
  • C Block the UDP protocol through ACL.
  • D Block the TCP protocol through ACL.
Explanation

Ping uses ICMP Echo Request and Echo Reply messages. Blocking ICMP through an ACL prevents outside hosts from successfully pinging hosts on the internal network.

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