How to Troubleshoot Matching RX Packets and Errors on a Network Interface?

A network administrator is investigating a network connectivity issue. The administrator runs a command to view the status of the network cards. The administrator receives the following output: RX packets:45332 errors: 45332 dropped:0 overruns 0 frame:0 Which of the following should the administrator troubleshoot based on the output?

Physical layer components Source Reference Answer
VLAN tagging configuration
Buffers on the card filling up
TCP/IP address settings

Community Votes

100%

100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.

Community Insight

Tests recognition that identical receive and error counters signal physical/media corruption rather than software or buffer issues.

This CompTIA Network+ N10-008 question evaluates your ability to interpret NIC interface statistics and isolate hardware faults. Community consensus confirms that a one-to-one ratio between received packets and errors strongly indicates physical layer degradation, such as damaged cabling or faulty transceivers.

Option C is frequently selected incorrectly because candidates associate high errors with system overload, but the explicit zero values for dropped and overrun counters definitively rule out buffer exhaustion.

Community Discussion (3 comments)

Mamad66 👍 5 Selected: A

The output shows that the number of received (RX) packets is equal to the number of errors. This indicates that every packet that is being received is also being marked as an error. This could be due to a problem with the physical layer components of the network, such as cabling, connectors, or the network interface card itself.

2c24cf3 👍 1 Selected: A

GPT: In this case, the errors field shows that there are 45,332 errors, and this number matches the RX packets value, indicating that every packet received has encountered an error. Steps to troubleshoot: Check Physical Connections: Ensure that all cables are securely connected and not damaged. Inspect Network Interface: Verify that the network card is functioning correctly and has the correct driver installed. Sometimes, updating or reinstalling the network card drivers can resolve such issues. Check for Hardware Issues: There might be a hardware issue with the network card itself. Testing with a different network card can help identify if the problem is hardware-related. Examine Network Configuration: Verify that the network settings (e.g., speed, duplex settings) are correctly configured and match the settings on the connected devices (switches, routers, etc.). Look at Network Load: High network traffic or a misconfigured network can cause excessive errors. Monitor network traffic to see if it is unusually high.

priestb3 👍 4

crc errors --> either caused by data link or physical

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Expert Analysis

Why the Answer Is Correct

The interface output displays RX packets exactly equal to errors, meaning every incoming frame was flagged as corrupted upon arrival. This precise 1:1 ratio is a textbook indicator of CRC errors, signal attenuation, or duplex mismatches originating at OSI Layer 1. Because the kernel successfully processed the hardware interrupts but the NIC hardware rejected the frames, the fault lies in the physical transmission medium or the network card itself.

Why the Other Options Are Wrong

VLAN tagging misconfigurations (B) typically result in untagged frame drops or complete communication isolation, not a direct RX-to-error spike. Buffer exhaustion (C) would manifest with non-zero dropped or overrun metrics, which are explicitly recorded as zero in this scenario. TCP/IP address settings (D) operate at Layer 3 and have no impact on low-level hardware frame reception counters or interface error logging.

Community Comment Notes

Top-voted discussions consistently emphasize that matching RX and error totals point directly to physical media faults, often citing CRC corruption as the underlying mechanism. One contributor clarifies that frame and CRC errors inherently belong to the data link or physical layers, guiding test-takers away from logical configuration traps. Another highly rated comment systematically validates the choice by cross-referencing the zero overrun values, demonstrating the exact diagnostic workflow expected on the exam.

Official Reference

https://linux.die.net/man/8/ifconfig

Exam Strategy

Always cross-reference error counters with drop and overrun metrics before escalating to higher-layer troubleshooting. Memorize that a proportional RX/TX-to-error ratio signals physical degradation, while isolated drop/overrun spikes indicate resource constraints or MTU mismatches.

Related Analysis

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