Unicast:
Communications, information transmission between a single sender and a single receiver.
Advantages: responsive, easier to implement personalized service, customized service. Disadvantages: consume bandwidth is too large, the server can not support.
Multicast:
Multicast Multicast meaning, corresponds to the communication between a sender and multiple receivers, communications can be shared between a plurality of received packet data sets can not be received outside of the receiving group. One pair of a group.
Anycast:
Communications between any sender and any receiver,