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Router route packets based on IP addresses which are outside your local network.
where as Switch forward frames based on mac addresses within your local network
Router :
1. Layer3 device .
2. based on IP address.
3. Checks routing table to get destination paths.
4. Routes packets to destination networks which are already learned through routing protocols.
Switch:
1. Layer2 device
2. Based on MAC address.
3. Check MAC table to get in which port destination device is connected.
