CompTIA Network+ (N10-009)Network SecurityMedium
A network technician is troubleshooting connectivity issues on a wired network. After running a cable tester, it indicates a 'split pair' fault. What is the most likely symptom users are experiencing due to this cabling issue?
- AIntermittent connectivity or reduced data transfer speeds.
- BNo connectivity at all.
- COnly half of the expected maximum speed (e.g., 100 Mbps on a Gigabit link).
- DIncorrect IP address assignment from the DHCP server.
Show answer & explanationAnswer & explanation
Correct answer: A. Intermittent connectivity or reduced data transfer speeds.
A split pair fault occurs when two wires from different pairs are swapped at both ends of a cable. While some connectivity might exist, it often leads to reduced performance, intermittent connectivity, or higher error rates because the twisted pair integrity is compromised, increasing crosstalk and attenuation.
Why the other options are wrong
- B. No connectivity typically indicates a complete break or open circuit.
- C. This symptom is more indicative of a cable only having two active pairs instead of four, often due to improper crimping or a device only supporting 10/100 Mbps.
- D. Incorrect IP address assignment is a DHCP server or client configuration issue, unrelated to physical cabling faults.
Split Pair Fault
A cabling fault where two wires from different twisted pairs are swapped at both ends of a cable, compromising the pair's twisting and increasing crosstalk.
- Occurs when a wire from one pair is crimped into the position of a wire from another pair.
- Does not always result in a complete circuit break, but degrades signal quality.
- Leads to increased crosstalk, higher error rates, and reduced network performance.
Memory trick: Cables can be broken, crossed, or shorted; each has its own pain.