COMPUTER NETWORKING

Detailed explanation-1: -In datagram networks, each data packet is routed independently from the source to the destination even if they belong to the same message. No prior resource or channel allocation is done for the individual packets.

Detailed explanation-2: -In a connectionless communication systems, datagram refers to the smallest unit via which data is transmitted. Datagrams are data packets which contain adequate header information so that they can be individually routed by all intermediate network switching devices to the destination.

Detailed explanation-3: -Datagram networks have the following characteristics: There is no fixed route between nodes, so no special action is needed to reestablish a path if a link or node fails. If each node knows which output links are operating, it transmits only on those links.

Detailed explanation-4: -Routing is the process by which systems decide where to send a packet. Routing protocols on a system “discover” the other systems on the local network. When the source system and the destination system are on the same local network, the path that packets travel between them is called a direct route.