What does internal/external mean?

What do u mean by unicast ? what do u mean by multicast ? what do u mean by anycast ?

• I want to know what do u mean by unicast ? what do u mean by multicast ? what do u mean by anycast ?

• Answer:

  In computer networking, ans 1) unicast transmission is the sending of messages to a single network destination identified by a unique address. ans 2) multicast is the delivery of a message or information to a group of destination computers simultaneously in a single transmission from the source creating copies automatically in other network elements, such as routers, only when the topology of the network requires it. ans 3) Anycast is a network addressing and routing methodology in which datagrams from a single sender are routed to the topologically nearest node in a group of potential receivers all identified by the same destination address.