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Everything starts with the biggest dump truck: the Ethernet frame. The packet format for Ethernet is
Destination Host Address | 6 bytes |
Source Host Address | 6 bytes |
Frame Type | 2 bytes |
Payload | 1500 bytes |
The destination address, as you will see momentarily, can be a specific MAC address or a broadcast address. MAC addresses are usually formatted as six colon -delimited bytes. Each byte spans the full 8-bit range of 0255, and the values are typically represented with ASCII-coded hexadecimal. For example, a valid Ethernet MAC address is 00:60:1D:02:08:B5. Notice that each packet received contains the MAC address of the sender (source).
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