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Exam 400-007 topic 1 question 173 discussion

Actual exam question from Cisco's 400-007
Question #: 173
Topic #: 1
[All 400-007 Questions]

A business invests in SDN and develops its own SDN controller that, due to budget constraints, runs on a single controller. The controller actively places an exclusive lock on the configuration of the devices to ensure it is the only source of changes to the environment. What is the result if the controller fails?

  • A. Manual changes are only possible until the controller is restored
  • B. All device configurations are in read-only mode until the controller is restored
  • C. The control plane is unavailable until the controller is restored
  • D. If a device fails, the configuration backup is unavailable
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by Dvnn at March 2, 2023, 3:38 a.m.

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biddid2
Highly Voted 1 year, 7 months ago
Selected Answer: B
Should be B, this case only mentions the controller for managing configuration modification only, but not act as control plane.
upvoted 5 times
blurain
9 months, 1 week ago
to add to this, it would be wise to move to a controller cluster model when handling the control plane, it is not the case in this scenario
upvoted 1 times
blurain
9 months, 1 week ago
changed my mind to C
upvoted 2 times
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rockin
Most Recent 4 months, 2 weeks ago
Selected Answer: A
Answer A: Manual changes remain possible during the controller downtime, though they are not ideal because they could cause inconsistency in the network. Once the controller is restored, it may overwrite the manual changes depending on its state. The failure of the controller does not lock devices into a read-only state; it only disables automated or centralized control. Manual intervention is still an option,
upvoted 1 times
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ba7a09d
4 months, 2 weeks ago
Selected Answer: B
Entire Control plane not in scope of in question. Appears to just be configuration. Am thinking the Augmented model from CH17 of The Art of Network Architecture.
upvoted 1 times
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Rollizo
9 months, 2 weeks ago
Selected Answer: C
SDN controller is control plane and centralice all the intelligent decisions
upvoted 3 times
Rollizo
9 months, 2 weeks ago
Could be the the controller crash and unlock the configurations or even has a timout. The clear thing here is that the control plane is off
upvoted 1 times
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Jerry81
1 year, 2 months ago
The answer should be . The control plane is unavailable until the controller is restored. The controller is unavailable how will you read the configuration ?
upvoted 3 times
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Learner64
1 year, 2 months ago
Selected Answer: B
Controller is about management. I think it is B.
upvoted 2 times
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Dvnn
1 year, 8 months ago
Isn't it B?
upvoted 4 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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