Cisco
200-301 · Question #150
How does STP prevent forwarding loops at OSI Layer 2?
The correct answer is D. Port blocking. TTL is a Layer 3 mechanism that routers decrement after a successful hop.
Submitted by marco_it· Mar 5, 2026Network Access
Question
How does STP prevent forwarding loops at OSI Layer 2?
Options
- ATTL
- BMAC address forwarding
- CCollision avoidance.
- DPort blocking
How the community answered
(33 responses)- A3% (1)
- B3% (1)
- D94% (31)
Explanation
TTL is a Layer 3 mechanism that routers decrement after a successful hop.
Topics
#STP#port blocking#Layer 2 loop prevention#forwarding
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