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To find the IP address associated with a given MAC address, connect to the router for the subnet that the device is on and run "show arp"You can speed up the process by only displaying the MAC/IP combo you are looking for with:"show arp | include [MA...
Yes your can use OSPF and VLANs. You will specify what VLANs OSPF is active on by using the command:network [network ID] [wildcard mask] area [area ID]this command is used uner the router ospf configuration context. Don't forget that the wildcard m...