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connection oriented routing vs connectionless routing

This page describes difference between connection oriented routing(virtual circuit routing) and connectionless routing(datagram services).

There are two main traffic types, the one requiring urgent delivery schedule and the other requiring no real time delivery. Based on this network determines routing services,protocols and call handling techniques. In connection oriented routing communication path between message source and destination is fixed for entire duration of the message transfer. In connectionless routing, no connection is established initially between source and destination and the the data/message to be transmitted is broken up into packets and each packet will travel thorough different routes to reach destination.The same is described below in the table.


connection oriented virtual circuit routing connectionless datagram routing
dedicated link is established at the start to deliver the entire message,hence it is more reliable No link is established initially for the and packets, hence it is less reliable
entire information is transmitted over a single channel. Different packets are transmitted over different routes/channels.
Due to direct connection,No re-ordering of data is required at the receiver end. Re-ordering of data is needed and done using sequence numbers embedded at the transmit side for each of the fragmented segments(packets).
When the call gets cut, full message need to be re-transmitted. When the connection gets dis-connected, only that particular packet is re-transmitted.
To establish the call,call set up procedure is required at the beginning. No such procedures are needed
Less overhead information is needed due to dedicated connection. More overhead information is needed to take care of delivery.

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