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

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

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Computer Networking
The physical layer, in reference to the OSI model, defines

the interface between the X.25 network and packet mode device
the virtual circuit interface to packet-switched service
data link procedures that provide for the exchange of data via frames that can be sent and received
All of these
None of these

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