Computer Networking
Contention is

a continuous frequency capable of being modulated or impressed with a second signal
the condition when two or more stations attempt to use the same channel at the same time
None of these
One or more conductors that serve as a common connection for a related group of devices
a collection of interconnected functional units that provides a data communications service among stations attached to the network

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

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