Computer Networking
Contention is

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

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Computer Networking
The application layer of a network

defines the user's port into the network
consists of software being run on the computer connected to the network
All of these
establishes, maintains, and terminates virtual circuits
None of these

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Computer Networking
You type the following command into the router and receive the following output:Router#show serial 0/0 ^% Invalid input detected at '^' marker.Why was this error message displayed?

Part of the command is missing.
You need to be in privileged mode.
The router does not have a serial0/0 interface.
You cannot have a space between serial and 0/0.

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