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Exam N10-008 topic 1 question 395 discussion

Actual exam question from CompTIA's N10-008

Question #: 395
Topic #: 1

While setting up a new workstation, a technician discovers that the network connection is only 100 full duplex (FD), although it is connected to a gigabit switch.

While reviewing the interface information in the switch CLI, the technician notes the port is operating at 100FD but shows many RX and TX errors. The technician moves the computer to another switchport and experiences the same issues.

Which of the following is MOST likely the cause of the low data rate and port errors?

A. Bad switchports
B. Faulty drivers
C. Cable length
D. Incorrect pin-out

Show Suggested Answer

Suggested Answer: D 🗳️

by Cyali at Feb. 8, 2023, 12:13 p.m.

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Cyali

Highly Voted 2 years ago

Selected Answer: D

A. Bad switchports - unlikely that multiple switchports are bad. sure it's possible, but occam's razor - one of the other answers is more likely B. Faulty drivers - faulty drivers would likely create bigger issues than tx/rx errors C. Cable length - would cause CRC errors, not tx/rx D. Incorrect pin-out - the only answer that really makes sense here; if the pinout is incorrect on the cable, it doesn't matter where you plug it in, you're gonna get tx/rx errors

upvoted 17 times

CookieChip

1 year, 10 months ago

Both cable length and cable quality can cause CRC errors and RX/TX errors in a network. CRC errors occur when there is a mismatch between the calculated and received cyclic redundancy check (CRC) values, which are used to detect errors in data transmission. These errors can be caused by a variety of factors, including cable length and quality. RX/TX errors refer to errors in the transmission or receipt of data on a network. These errors can also be caused by a variety of factors, including cable length and quality. In general, when a cable is too long or of poor quality, it can cause attenuation, which leads to a weaker signal and a higher likelihood of errors in data transmission. Therefore, it is possible for cable length to cause both CRC errors and RX/TX errors in a network.

upvoted 2 times

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Jakub2023

1 year, 11 months ago

I don’t see how D could explain the speed degradation… I would go with B. Driver issues can cause all kinds of problems, big and small.

upvoted 1 times

b0bby

9 months, 2 weeks ago

This one a 20 year old thing. Crossover cables you used to only need to swap pins 1,2 with 3,6 as pins 45 and 78 did nothing. but since 5E those cables matter if you don't swap them your speed drops down to 100 MBs.

upvoted 1 times

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PaytoPlay

Highly Voted 1 year, 9 months ago

Selected Answer: D

I had this happen to me while on a job. I was testing the for full duplex but keep getting 100, come to find out I had made a mistake on the 110 block punching one of the wires in and ended up crossing the wires.

upvoted 5 times

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Dima1993

Most Recent 11 months, 1 week ago

Mehsotopes is a troll

upvoted 1 times

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Dima1993

11 months, 1 week ago

Mehsotopes

upvoted 1 times

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e5c1bb5

11 months, 3 weeks ago

Selected Answer: D

incorrect pin outs

upvoted 1 times

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Mehsotopes

1 year, 2 months ago

Selected Answer: B

Without proper drivers, you will not be able to utilize the ports & traffic usage for devices that would otherwise be necessary.

upvoted 2 times

e5c1bb5

11 months, 3 weeks ago

if this guy says b then go D. he is wrong 90% of the time

upvoted 7 times

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I_Know_Everything_KY

1 year, 3 months ago

Selected Answer: D

D: Incorrect pin-out Cable length could be possible, where some evidence of excessive cable length is being used, but not here. Unlikely more than one switchport is faulty. Faulty drivers in not even given as a possible cause in Comptia materials.

upvoted 1 times

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Eumousten

1 year, 5 months ago

Selected Answer: D

Correct me if I'm wrong. But you only need 2 wire pairs(1-3,2-6) to be able to get 100mbps. Although the network is 1gbps the other 2 wire pairs may be open, badly crimped and not touching the connector?

upvoted 2 times

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Juliana1017

1 year, 6 months ago

Selected Answer: C

C, the cable length

upvoted 1 times

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1stAid

1 year, 10 months ago

Selected Answer: B

B. Driver could be old or bad and only letting 100mbps. incorrect pin out will probably give another issue like no connection at all. Since moving it to another switch port didn't fix the issue. It seems like there's something wrong with the computer itself and not cabling.

upvoted 1 times

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swiggharo

1 year, 10 months ago

Selected Answer: C

Chatgpt: An incorrect pin-out would cause the connection to not work at all, rather than just operating at a lower speed with errors. Additionally, if the pin-out was incorrect, it would likely not work when the computer was moved to another switchport, as the issue would be with the cable or termination, rather than a specific switchport. Therefore, it is less likely that incorrect pin-out is the cause of the issue described in the scenario.

upvoted 2 times

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IT__noob

1 year, 10 months ago

Selected Answer: C

Cable length is the MOST likely cause of the low data rate and port errors. Ethernet has a maximum distance of 100 meters (328 feet) for twisted-pair copper cabling, and if the cable is too long, it can cause signal attenuation, leading to a lower data rate and errors. The RX and TX errors on the switch port are also indicators of this issue.

upvoted 2 times

Gustitute

1 year, 10 months ago

I believe you are correct. D, incorrect pin-out could be the issue but C, cable length is more likely. C is the strongest answer.

upvoted 1 times

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Cannnon

1 year, 10 months ago

Selected Answer: B

Faulty drivers b

upvoted 1 times

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StellarSteve

1 year, 10 months ago

Going with D The most likely cause of the low data rate and port errors in this scenario is incorrect pin-out. If the pin-out is incorrect on the cable, it will cause communication errors between the device and the switch, resulting in RX and TX errors.

upvoted 3 times

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Jakub2023

1 year, 11 months ago

Selected Answer: B

B is correct, I think, see my response to Cyali.

upvoted 1 times

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pedrwc7

2 years ago

Selected Answer: D

I agree with Cyali.

upvoted 2 times

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