GSEC · Question #353
Which of the following protocols multicasts messages and information among all member devices in an IP multicast group?
The correct answer is A. IGMP. IGMP is the protocol responsible for managing and communicating multicast group membership among devices on an IP network. It allows routers and hosts to coordinate which devices receive multicast traffic.
Question
Which of the following protocols multicasts messages and information among all member devices in an IP multicast group?
Options
- AIGMP
- BTCP
- CARP
- DICMP
How the community answered
(25 responses)- A72% (18)
- B16% (4)
- C8% (2)
- D4% (1)
Why each option
IGMP is the protocol responsible for managing and communicating multicast group membership among devices on an IP network. It allows routers and hosts to coordinate which devices receive multicast traffic.
IGMP (Internet Group Management Protocol) operates at Layer 3 and is specifically designed to allow hosts to join and leave IP multicast groups, and to communicate group membership information to adjacent multicast routers. It multicasts control messages to all members of a group so routers know which interfaces have active multicast listeners. No other listed protocol performs this multicast group management function.
TCP is a unicast, connection-oriented transport-layer protocol used for reliable point-to-point data delivery, not multicast group management.
ARP resolves IPv4 addresses to MAC addresses on a local network segment and has no role in multicast group communication.
ICMP is used for network diagnostics and error reporting (such as ping and traceroute) and does not manage multicast group membership.
Concept tested: IGMP role in IP multicast group management
Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/mcast/multicast-overview
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