CNX-001 · Question #73
What is the MOST likely cause of increased latency and packet retransmissions in a high- bandwidth, low-latency environment?
The correct answer is C. Duplex mismatch. A duplex mismatch occurs when one side of a link is configured for full-duplex and the other for half-duplex. The half-duplex side uses CSMA/CD and interprets simultaneous transmissions as collisions, triggering retransmissions and backoff timers. This creates significant latency
Question
What is the MOST likely cause of increased latency and packet retransmissions in a high- bandwidth, low-latency environment?
Options
- AMTU fragmentation
- BAsymmetric routing
- CDuplex mismatch
- DVLAN misconfiguration
How the community answered
(33 responses)- A6% (2)
- B3% (1)
- C82% (27)
- D9% (3)
Explanation
A duplex mismatch occurs when one side of a link is configured for full-duplex and the other for half-duplex. The half-duplex side uses CSMA/CD and interprets simultaneous transmissions as collisions, triggering retransmissions and backoff timers. This creates significant latency and throughput degradation - especially noticeable in high-bandwidth environments where traffic is frequent. MTU fragmentation (A) causes overhead but is not the primary driver of retransmissions. Asymmetric routing (B) can cause issues but is less common in a single high-bandwidth link context. VLAN misconfiguration (D) would typically cause connectivity failures, not retransmissions.
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