Which of the following protocols multicasts messages and information among all member devices in an IP multicast group?
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A. B. C. D.D.
The correct answer is D. IGMP.
IGMP stands for Internet Group Management Protocol. It is a communication protocol used by IP hosts to join a multicast group. A multicast group is a group of devices that are interested in receiving the same multicast traffic. When a device joins a multicast group, it sends an IGMP join message to the multicast router, which informs the router to start forwarding multicast traffic to the group.
IGMP operates at the network layer (layer 3) of the OSI model and is used in conjunction with IP. It enables devices to communicate their membership in multicast groups to routers, which can then forward multicast traffic to all members of the group.
In contrast, ARP (Address Resolution Protocol) is used to map a device's IP address to its MAC address on a local network. ICMP (Internet Control Message Protocol) is used for error reporting and diagnostic functions, such as ping. TCP (Transmission Control Protocol) is a reliable, connection-oriented protocol used for transmitting data over the Internet.
Therefore, IGMP is the only protocol among the four options that is specifically designed for multicasting messages and information among all member devices in an IP multicast group.