Discussion
Which of the following is a layer 2 protocol used to maintain a loop-free network?
Answer: B
Correct answer: STP
STP is the layer 2 loop-avoidance protocol: it elects a root bridge and blocks the ports that would otherwise complete a loop, leaving one active path. VTP distributes VLAN information, RIP is a layer 3 routing protocol, and CDP discovers directly connected Cisco devices.
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