Computer Networking
The method of communication in which transmission takes place in both directions, but only one direction at a time is called

Four wire circuit
Full Duplex
Half Duplex
Simplex

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

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

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