Computer Networking
You are connecting your access point and it is set to root. What does Extended Service Set ID mean?

That you have multiple access points, but they are placed physically in different buildings.
That you have multiple access points, but one is a repeater access point.
That you have more than one access point and they are in separate SSIDs connected by a distribution system.
That you have more than one access point and they are in the same SSID connected by a distribution system.

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Computer Networking
What is the problem with an interface if you type show interface serial 0 and receive the following message? "Serial0 is administratively down, line protocol is down."

The keepalives are different times.
The administrator is pinging from the interface.
The administrator has the interface shut down.
No cable is attached.

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