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Exam 200-301 topic 1 question 215 discussion

Actual exam question from Cisco's 200-301
Question #: 215
Topic #: 1
[All 200-301 Questions]

How does STP prevent forwarding loops at OSI Layer 2?

  • A. TTL
  • B. MAC address forwarding
  • C. Collision avoidance
  • D. Port blocking
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by ZUMY at April 29, 2021, 7:54 p.m.

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mikachuu85
Highly Voted 2 years, 11 months ago
Selected Answer: D
Correct answer is D as TTL is Layer 3 which won't apply in this scenario. Thus, answer A is wrong.
upvoted 21 times
laurvy36
2 years, 11 months ago
true, that is the explenation
upvoted 2 times
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ZUMY
Highly Voted 3 years, 9 months ago
D is correct
upvoted 7 times
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i_am_confused
Most Recent 2 years, 7 months ago
Selected Answer: D
100% D. As others have said TTL is layer 3
upvoted 1 times
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ZUMY
2 years, 7 months ago
D is correct
upvoted 2 times
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lohaN73
2 years, 8 months ago
TTL is a layer 3 issue,not works at Layer 2
upvoted 1 times
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onikafei
3 years ago
Selected Answer: D
Learned about looping in other training as well. Port blocking prevents traffic from getting stuck going in circles between other ports. I would have to say it's D in this case
upvoted 2 times
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galgold
3 years ago
Selected Answer: D
confirmed
upvoted 1 times
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wpena
3 years, 2 months ago
Selected Answer: A
The STP loop guard feature provides additional protection against Layer 2 forwarding loops (STP loops). If BPDUs are not received on a non-designated port, and loop guard is enabled, that port is moved into the STP loop-inconsistent blocking state, instead of the listening / learning / forwarding state.
upvoted 3 times
aike92
3 years ago
Correct Ans is D. (if i'm not mistaken) TTL is a Layer 3 mechanism that routers decrement after a successful hop
upvoted 4 times
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Tengereni
3 years, 8 months ago
explanation
upvoted 2 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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