Exam N10-008 topic 1 question 56 discussion

Actual exam question from CompTIA's N10-008

Question #: 56
Topic #: 1

A network engineer is investigating reports of poor network performance. Upon reviewing a device configuration, the engineer finds that duplex settings are mismatched on both ends. Which of the following would be the MOST likely result of this finding?

A. Increased CRC errors
B. Increased giants and runts
C. Increased switching loops
D. Increased device temperature

Show Suggested Answer

Suggested Answer: A 🗳️

by KlausSchwab at Feb. 18, 2022, 8:20 p.m.

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onikafei

Highly Voted 1 year, 6 months ago

Selected Answer: A

A is correct. A mismatch will usually generate excessive CRC errors. Mismatch = ERROR

upvoted 12 times

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StevenElev11n

Highly Voted 1 year ago

Selected Answer: A

- The different duplex settings on both ends of a connection can cause a mismatch in the flow control (sending data at different speed), leading data collisions. These collisions can result in corrupted data and increase the number of CRC errors.

upvoted 7 times

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famco

Most Recent 10 months ago

From wikipedia on the duplex mismatch page: "This results in the full-duplex side receiving an incomplete frame with CRC error or a runt frame" So, it is a question to think about

upvoted 5 times

famco

10 months ago

But because the option has runts and giants, that should not happen so CRC error is the right option

upvoted 2 times

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carloshernandez5018

10 months ago

Selected Answer: B

According to the official CompTIA Network+ 008 Student Guide (Lesson 12, page 291): "A runt is a frame that is smaller than the minimum size (64 bytes for Ethernet). A runt frame is usually caused by a collision. In a switched environment, collisions should only be experienced on an interface connected to a legacy hub device and there is a duplex mismatch in the interface configuration (or possibly on a misconfigured link to a virtualization platform)." It looks like Runt Frame Errors are caused by Collisions, and collisions are caused by Duplex Mismatch. Option B sounds like a good answer to me.

upvoted 2 times

famco

10 months ago

I get your point and good point, but the option has "giants and runts" so that is not a correct option. In addition to that CRC error can also be the result of the mismatch. I just hope these kind of questions does not come

upvoted 4 times

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JakeCharles

1 year ago

Selected Answer: A

increased crcs errors

upvoted 2 times

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LeonardSnart

1 year, 3 months ago

Selected Answer: A

For monitoring and troubleshooting purposes, interface diagnostics might be accessible. This diagnostic information might include various error conditions, such as late collisions or cyclic redundancy check (CRC) errors, which might indicate a duplex mismatch. --Anthony Sequeira, N10-008 Cert Guide

upvoted 4 times

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