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Question 819 - N10-008 discussion

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Newly crimped 26ft (8m) STP Cat 6 patch cables were recently installed in one room to replace cables that were damaged by a vacuum cleaner. Now, users in that room are unable to connect to the network. A network technician tests the existing cables first. The 177ft (54m) cable that runs from the core switch to the access switch on the floor is working, as is the 115ft (35m) cable run from the access switch to the wall jack in the office. Which of the following is the most likely reason the users cannot connect to the network?

A.
Mixed UTP and STP cables are being used.
Answers
A.
Mixed UTP and STP cables are being used.
B.
The patch cables are not plenum rated.
Answers
B.
The patch cables are not plenum rated.
C.
The cable distance is exceeded.
Answers
C.
The cable distance is exceeded.
D.
An incorrect pinout on the patch cable is being used.
Answers
D.
An incorrect pinout on the patch cable is being used.
Suggested answer: D

Explanation:

Given that the longer cables within the infrastructure are working correctly but the newly installed patch cables are causing connectivity issues, the most likely cause is an incorrect pinout on the patch cables. If these cables were not properly crimped according to the T568A or T568B wiring standards, they could easily cause a failure in connectivity due to incorrect alignment of the transmitting and receiving pins. This is a common issue with DIY or newly crimped cables where mistakes in the wire arrangement can render the cables non-functional. The other listed issues, such as mixed cable types, plenum rating, or cable distance exceedance, would not typically result in a total loss of connectivity as described.

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asked 02/10/2024
Ernesto Barba
39 questions
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