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

Collision
None of these
Asynchronous
Synchronous
Contention

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Computer Networking
Two computers that communicate with each other use a simple parity check to detect errors for ASCII transmissions. Which of the following events will always lead to an undeleted error?

one bit or any odd number of bits inverted in a byte during transmission
two bits or any even number of bits inverted in a block during transmission
one bit or any odd number of bits inverted in a block of data during transmission
None of these
two bits or any even number of bits inverted in a byte during transmission

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Computer Networking
Which statement describes a spanning-tree network that has converged?

All switch and bridge ports are either blocking or looping.
All switch and bridge ports are in either the forwarding or blocking state.
All switch and bridge ports are assigned as either root or designated ports.
All switch and bridge ports are in the forwarding state.

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