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

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

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Computer Networking
HDLC (High-level Data Link Control) is

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

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