Computer Networking
Which of the following is a wrong example of network layer?

Source routing and domain naming-USENet
X.25 Packet Level Protocol (PLP)-ISO
X.25 level 2-ISO
Internet Protocol (IP) - ARPANET

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Computer Networking
Communication network is

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

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