Physical addressing in a wan, Computer Networking

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PHYSICAL ADDRESSING IN A WAN:

The physical addressing in a WAN is same as in LAN in the following way:

The data is send in packets equivalent to frames.
Every packet has a format with header.
The packet header adds source addresses and destination.
One part of address checks destination switch. Other part of address checks port on switch. This is given in the figure below.

801_PHYSICAL ADDRESSING IN A WAN.png

Figure

NEXT HOP FORWARDING:

Packet switch must select outgoing connection for forwarding the packet. There are two types.

If the destination is local machine, packet switch sends computer port.
If the destination is added another switch, this packet switch forwards to next hop through connection to next switch.
The selection of another switch is based on destination address in frame.

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