Computer Networking
Which of the following conditions is used to transmit two packets over a medium at the same time?

None of these
Asynchronous
Contention
Collision
Synchronous

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Computer Networking
Which of the following characteristic(s) is/are suited to the PSS applications?

All of these
widely dispersed terminals and access to international packets switched services
None of these
bursty traffic and low communications intensity
Multiple remote host or applications accessed by a single local access circuit terminal and circuit

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Computer Networking
X.21 is

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

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