Advanced topics

Ethernet packets, Ethernet frames and IP packets in the Virtual World

On layer 2, we are transmitting ethernet frames. Confusingly, these are sometimes referred to as ethernet packets. They are in fact not quite the same thing. The IEEE standard is shown below The ethernet packet is the frame plus some extra headers and trailers When the ethernet frame (or packet) arrives at the NIC, it …

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VLANS

Recall we had a scenario with two switches each with a different subnet connected together by a router. It is possible through switch programming to achieve the same thing with a single switch or multiple switches – that is we can make groups of ports on a switch act as though they are a single …

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