Describe the challenge associated with multicast communication and review how multicast communication operates, the IP address range involved, and the protocol that makes this possible.
What will be an ideal response?
The challenge to multicasting is determining who wants to receive the multicast and who does not. The Internet Group Management Protocol (IGMP) enables routers to communicate with hosts to determine a "group" membership. Multicast is in the Class D range (224.0.0.0-239.255.255.255). Multicast addresses only use a subset of the Class D range. Multicast does not, however, assign IP addresses to individual hosts in the same manner as normally seen. Instead, a particular multicast (called an IGMP group) is assigned to an address in the Class D range, and those who wish to receive this multicast must tell their upstream router or switch (which must be configured to handle multicasts) that they wish to receive it. To do so, they join the IGMP group.
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