Computer Networking
In OSI network architecture, the dialogue control and token management are responsibilities of

None of these
data link layer
session layer
network layer
transport layer

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Computer Networking
In geosynchronous orbit, satellite

moves simultaneously
remains in a fixed position so that as earth rotates, it can fully cover the earth
remains in a fixed position related to points on earth
moves faster than the earth's rotation so that it can cover larger portion of earth.
None of these

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Computer Networking
X.21 is

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

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