N10-005 · Question #958
In order for switching loops to be automatically disabled, which of the following needs to be implemented?
The correct answer is D. Spanning-tree protocol. Spanning Tree Protocol (STP, IEEE 802.1D) is specifically designed to prevent Layer 2 switching loops in networks with redundant switch paths. STP elects a root bridge and then automatically blocks redundant ports so that only one active path exists between any two network…
Question
In order for switching loops to be automatically disabled, which of the following needs to be implemented?
Options
- ARouting tables
- BCollision domains
- CPort mirroring
- DSpanning-tree protocol
How the community answered
(27 responses)- A7% (2)
- B4% (1)
- D89% (24)
Explanation
Spanning Tree Protocol (STP, IEEE 802.1D) is specifically designed to prevent Layer 2 switching loops in networks with redundant switch paths. STP elects a root bridge and then automatically blocks redundant ports so that only one active path exists between any two network segments. If an active link fails, STP recalculates and unblocks a previously blocked port to restore connectivity-automatically, without manual intervention. Routing tables operate at Layer 3 and do not affect Layer 2 loops. Collision domains are a Layer 1/2 concept related to CSMA/CD, not loop prevention. Port mirroring copies traffic to a monitoring port and has no effect on loops.
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