Explain how it is possible for a sequence of packets transmitted through a wide area network to
arrive at their destination in an order that differs from that in which they were sent. Why can’t this
happen in a local network?
What will be an ideal response?
Packets transmitted through a store-and-forward network travels by a route that is determined dynamically for
each packet. Some routes will have more hops or slower switches than others. Thus packets may overtake each
other. Connection-oriented protocols such as TCP overcome this by adding sequence numbers to the packets
and re-ordering them at the receiving host.
It can’t happen in local networks because the medium provides only a single channel connecting all of
the hosts on the network. Packets are therefore transmitted and received in strict sequence.
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