CISSP-ISSAP · Question #165
Which of the following protocols multicasts messages and information among all member devices in an IP multicast group?
The correct answer is D. IGMP. IGMP (Internet Group Management Protocol) is specifically designed to manage IP multicast group membership - it's the protocol that allows routers and hosts to communicate about which devices belong to which multicast groups, enabling messages to be distributed to all members…
Question
Which of the following protocols multicasts messages and information among all member devices in an IP multicast group?
Options
- AARP
- BICMP
- CTCP
- DIGMP
How the community answered
(25 responses)- A4% (1)
- C4% (1)
- D92% (23)
Explanation
IGMP (Internet Group Management Protocol) is specifically designed to manage IP multicast group membership - it's the protocol that allows routers and hosts to communicate about which devices belong to which multicast groups, enabling messages to be distributed to all members efficiently.
Why the distractors are wrong:
- A. ARP resolves IP addresses to MAC addresses on a local network - it has nothing to do with multicast group management.
- B. ICMP handles error reporting and diagnostics (e.g., ping) between hosts, not multicast group coordination.
- C. TCP is a unicast, connection-oriented transport protocol focused on reliable point-to-point delivery, not one-to-many multicast distribution.
Memory tip: Think of IGMP as the "guest list manager" for a multicast party - it keeps track of who (which devices) belongs to which group, so the router knows where to send the multicast traffic.
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