Computer Networking
A machine that connects to two or more electronic mail systems and transfers mail messages among them is known as

None of these
bridges
Gateways
User Agent
mail gateway

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Computer Networking
Satellite-Switched Time-Division Multiple Access (SS/TDMA) is

All of these
a form of TDMA in which circuit switching is used to dynamically change the channel assignments
None of these
a medium access control technique for multiple access transmission media
the method of determining which device has access to the transmission medium at any time.

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