plague
show version
arp -a show arp
show interface status
To verify if a serial interface is operating as a Data Terminal Equipment (DTE) or Data Communication Equipment (DCE), you can use the command show controllers in Cisco IOS. This command displays detailed information about the serial interface, including whether it is configured as a DTE or DCE. The output will typically indicate the role of the device, and a DCE interface will often show the clock rate configuration.
show ip interface
nslookup
Yes. A router will de-capsulate an frame to verify it was destined for itself. Frames are layer 2.
winipcfg
show n ?
You should verify that your router was purchased at a Best Buy. Before you call, make sure to have all the information about the router and your network connection available, and they should be able to help you.
Chances are your computer's network card does not have up to date drivers or configuration. Check the manufacturer's website and verify that you have the most recent driver, otherwise the router could be at fault (it might not be assigning a new IP address when your computer identifies itself on the network). Check the drivers first, however.
Telnet