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

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

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Computer Networking
CSMA (Carrier Sense Multiple Access) is

a very common bit-oriented data link protocol issued by ISO.
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.
network access standard for connecting stations to a circuit-switched network
None of these

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