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How does the MAC address affect routers/switches?

Learn what MAC addresses have to do with network routers and switches from our routing and switching expert.

How does the MAC address affect routers/switches?
Routers/switches usually have a bunch of MAC addresses reserved. One MAC address is assigned to every interface on the router/switch. So when a router/switch originates a packet, it appends the MAC address corresponding to the interface which is generating the packet.
This was last published in November 2004

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