Which destination IP address can a host use to send one message to multiple devices across different subnets?

Which destination IP address can a host use to send one message to multiple devices across different subnets?
A . 172.20.1.0
B . 127.0.0.1
C . 192.168.0.119
D . 239.255.0.1

View Answer

Answer: D

Explanation:

Multicast is a networking protocol where one host can send a message to a special multicast IP address and one or more network devices can listen for and receive those messages.

Multicast works by taking advantage of the existing IPv4 networking infrastructure, and it does so in something of a weird fashion. As you read, keep in mind that things are a little confusing because multicast was "shoe-horned" in to an existing technology. For the rest of this article, let’s use the multicast IP address of 239.255.0.1. We’ll not worry about port numbers yet, but make a mental note that they are used in multicast. We’ll discuss that later.