Computer Networking
End-to-end connectivity is provided from host-to-host in:

Network layer
Data link layer
Session layer
None of these
Transport layer

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Computer Networking
Contention is

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
the condition when two or more stations attempt to use the same channel at the same time
a continuous frequency capable of being modulated or impressed with a second signal

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