N10-005 · Question #278
N10-005 Question #278: Real Exam Question with Answer & Explanation
The correct answer is D: White Green. In the T568A wiring standard, Pin 1 carries the White/Green wire and Pin 3 carries the White/Orange wire. The cable tester output reveals a crossed connection between pins 1 and 3 - the White/Green wire (which belongs at Pin 1) has been placed at Pin 3, and vice versa. This swap
Question
Options
- AWhite Orange
- BSolid Brown
- CSolid Orange
- DWhite Green
Explanation
In the T568A wiring standard, Pin 1 carries the White/Green wire and Pin 3 carries the White/Orange wire. The cable tester output reveals a crossed connection between pins 1 and 3 - the White/Green wire (which belongs at Pin 1) has been placed at Pin 3, and vice versa. This swap causes a connectivity failure because the transmit and receive pairs are mismatched. The White/Green wire (Answer D) is the specific strand responsible, as it is out of position relative to the T568A specification. Pins 1, 2, 3, and 6 carry data in Fast Ethernet, so any fault in the green pair (Pins 1/2) directly breaks connectivity.
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