CCNA: Cisco Certified Network Associate — Question 490

A client experiences slow throughput from a server that is directly connected to the core switch in a data center. A network engineer finds minimal latency on connections to the server, but data transfers are unreliable, and the output of the show interfaces counters errors command shows a high FCS-Err count on the interface that is connected to the server. What is the cause of the throughput issue?

Answer options

• A. a physical cable fault
• B. a speed mismatch
• C. high bandwidth usage
• D. a cable that is too long

Correct answer: A

Explanation

The correct answer is A, as a high FCS-Err count typically indicates issues with the physical layer, such as a faulty cable. Options B, C, and D do not directly explain the high error count and unreliable data transfers, which are symptomatic of physical layer problems rather than configuration or usage issues.