Multicast and broadcast include their own ports. Both multicast and broadcast have their own addresses and port numbers. Multicast, also known as multicast, can be understood as a person talking to many people present, but not all of them. Here, many people are also called a group, that is, multicast is a one-to-one communication mode, and broadcast is a one-to-many communication mode between hosts. It can be understood that one person speaks to everyone through a broadcast speaker, that is, all hosts in the network can receive information whether they need it or not.