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What is the difference between packet & message switching?

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A complete message is passed across a network.Message is broken into smaller units known as Packets.
In this, computer language used is ASCII, baudot, morse.In packet switching, binary type is used.
In message switching there is no limit on block size.Packet switching places a tight upper limit on block size.
Message exist only in one location in the network.Parts i.e. packets of the message exist in many places in the network.
Example: Hop-by-hop Telex forwarding and UUCP(UNIX-to-UNIX Copy Protocol)Example: Frame Relay, IP, and X. 25
Physical links are allocated dynamically.Virtual links are made simultaneously.

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