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

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

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Computer Networking
CSMA (Carrier Sense Multiple Access) is

a method of determining which device has access to the transmission medium at any time
a method access control technique for multiple-access transmission media.
a very common bit-oriented data link protocol issued by ISO.
None of these
network access standard for connecting stations to a circuit-switched network

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