CISSP – Information Systems Security Architecture Professional (ISSAP) — Question 19

Which of the following protocols multicasts messages and information among all member devices in an IP multicast group?

Answer options

• A. ARP
• B. ICMP
• C. TCP
• D. IGMP

Correct answer: D

Explanation

The correct answer is D, IGMP, which is specifically designed for managing multicast group membership and facilitating communication among devices in a multicast group. Options A (ARP), B (ICMP), and C (TCP) do not handle multicast messaging; ARP is used for address resolution, ICMP for error messages and diagnostics, and TCP is a connection-oriented protocol that does not support multicast.