Computer Networking
In geosynchronous orbit, satellite

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

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Computer Networking
X.21 is

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

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