Computer Networking
The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to

0.999
0.009
0.991
None of these
0.003

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Computer Networking
What is the purpose of Spanning Tree Protocol in a switched LAN?

To prevent routing loops in networks with redundant paths
To manage the VLAN database across multiple switches
To provide a mechanism for network monitoring in switched environments
To create collision domains
To prevent switching loops in networks with redundant switched paths

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