Many networks do not provide guarantees of delivery, nonduplication of packets, or in-order delivery of packets, e.g., the UDP protocol of the Internet. However, it is possible to layer a transport protocol on top of the packet service that can provide such protection; TCP and UDP are the best examples of layer 4, the Transport Layer, of the seven layered OSI model.
The header of a packet specifies the data type, packet number, total number of packets, and the sender's and receiver's IP addresses.
The term frame is sometimes used to refer to a packet exactly as transmitted over the wire or radio.
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