Why is a 150m Cat 6 link causing slow speeds and intermittent connectivity?
Short answer
B Install an access switch in the annex and run fiber to the distribution switch.
Question
Key Takeaways
The question tests your knowledge of Ethernet cabling distance limitations and the proper use of fiber for long runs, with the trap being that upgrading the copper cable or adjusting settings cannot overcome the 100m copper limit.
This exam question covers Ethernet cable distance limits, specifically that Cat 6 copper cabling is limited to 100 meters. The correct fix for a 150m connection is to install an access switch and run fiber to the distribution switch, as confirmed by community consensus.
Common mistake: Choosing to 'Run a Cat 7 cable' is the most common mistake because Cat 7 is faster and newer, but it still has the same 100-meter copper distance limitation, so it would not fix the signal degradation.
Expert Analysis
Why the Answer Is Correct
Option B is correct because a 150m Cat 6 cable run exceeds the maximum 100-meter distance for Ethernet over copper cabling, causing severe signal attenuation and packet loss. Installing an access switch near the annex shortens the copper segment to a compliant distance, then using fiber for the long backbone run to the distribution switch is the industry-standard solution. As comment [2] notes, the symptoms of slow speeds and intermittent connectivity occur because the Cat 6 run exceeds the maximum recommended length, and fiber is required for longer distances.
Why the Other Options Are Wrong
Option A (increasing bandwidth allocation) does nothing to fix a physical-layer attenuation problem; the signal is already degraded, so allocating more bandwidth cannot improve reliability. Option C (running a Cat 7 cable) is incorrect because Cat 7 is still a copper cable and must also adhere to the same 100-meter Ethernet distance limit, as highlighted indirectly by comment [1] that the issue is the distance exceeding the recommended maximum for copper. Option D (enabling jumbo frames) only affects larger packet sizes and cannot mitigate the exceeding distance limit; in fact, it could worsen performance over a degraded link.
Community Comment Notes
Comment [1] clearly states that the 492ft (150m) distance exceeds the recommended maximum for Ethernet over copper, while comment [2] explains the signal degradation over extended distance and the correct solution. Comment [3] agrees that the cable length is too long for Cat 6, and comment [4] reinforces that no copper cable choice would help at that distance, emphasizing that fiber is needed to avoid attenuation.
Official Reference
- https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Distance_limits
- https://www.commscope.com/globalassets/digizuite/52735-tia-568-0-d.pdf
These links open the official vendor documentation in a new tab.
Exam Strategy
Remember the 100-meter rule for all twisted-pair copper cabling (Cat 5e, Cat 6, Cat 6A, Cat 7). On exam day, any question mentioning a copper cable run longer than 100m should immediately point to installing an access switch and using fiber for the long-distance segment.
Community Votes
100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 4 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 4
-
Babatundeio 👍 3option be because of the slow speeds and intermittent connectivity for a computer connected via a Cat 6 cable to a distribution switch located 492ft (150m) away. This distance exceeds the recommended maximum distance for Ethernet over copper cables like Cat 6.
-
subaie503 👍 2 Answered BB. Install an access switch in the annex and run fiber to the distribution switch. The issue stems from the Cat 6 cable running a distance of 492ft (150m), which exceeds the maximum recommended length of 100 meters (approximately 328 feet) for Ethernet over copper cabling. This can cause slow speeds and intermittent connectivity due to signal degradation over the extended distance.
-
Cavick 👍 2 Answered BThe cable length is too long for Cat6 as highlighted by others
-
yeeterskeeter 👍 1 Answered Bno other cable choice would help in this situation. you would need fiber for that distance. increasing bandwidth would do nothing in this situation because the signal is barely getting to him due to attenuation.
Reader comments & corrections
No reader corrections yet — spotted an error or have a note? Share it below.