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What is the difference between a packet and a frame?
A packet and a frame are both packages of data moving through a network.
A packet exists at Layer 3 of the OSI Model, whereas a frame exists at Layer 2 of the OSI Model.
Layer 2 is the Data Link Layer. The best known Data Link Layer protocol is Ethernet.
Layer 3 is the Network Layer. The best know Network Layer protocol is IP (Internet Protocol).
To move through a network, a packet is encapsulated into one or more frames, depending upon the MTU size.
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