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Exam 400-007 topic 1 question 173 discussion

Actual exam question from Cisco's 400-007

Question #: 173
Topic #: 1

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

Suggested Answer: B 🗳️

by Dvnn at March 2, 2023, 3:38 a.m.

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biddid2

Highly Voted 1 year, 9 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

10 months, 3 weeks 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

10 months, 3 weeks ago

changed my mind to C

upvoted 2 times

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rockin

Most Recent 6 months 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

6 months 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

11 months, 1 week ago

Selected Answer: C

SDN controller is control plane and centralice all the intelligent decisions

upvoted 3 times

Rollizo

11 months, 1 week 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, 4 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, 4 months ago

Selected Answer: B

Controller is about management. I think it is B.

upvoted 2 times

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Dvnn

1 year, 9 months ago

Isn't it B?

upvoted 4 times

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