The answer is a faulty physical network cable or NIC. CRC errors and dropped Rx packets on a distributed virtual switch port are direct symptoms of physical-layer corruption, where the cyclic redundancy check computed by the receiver fails to match the frame’s CRC field, indicating signal integrity issues at Layer 1. On the VMware Certified Professional Data Center Virtualization VCP-DCV exam, this scenario tests your ability to distinguish physical-layer faults from software or configuration problems—a common trap is to blame the virtual switch or driver settings first. Remember that CRC errors always point to the physical medium, not the virtual layer. A useful memory tip is “CRC = Cable or Connector,” reinforcing that Layer 1 hardware is the root cause.
VCP-DCV vSphere Performance and Scaling Practice Question
This VCP-DCV practice question tests your understanding of vsphere performance and scaling. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
```
# dvs_port_statistics (partial)
Port ID: 1234
Packets Received: 15000000
Packets Transmitted: 10000000
Dropped Rx: 150
Dropped Tx: 10
Rx CRC Errors: 10
```
Refer to the exhibit. A distributed virtual switch port shows dropped Rx packets and CRC errors. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Faulty physical network cable or NIC.
CRC errors and dropped Rx packets on a distributed virtual switch port indicate physical-layer corruption of frames, typically caused by a faulty cable, damaged NIC, or bad transceiver. These errors occur when the cyclic redundancy check (CRC) computed by the receiver does not match the frame's CRC field, which is a direct symptom of signal integrity issues at Layer 1.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Faulty physical network cable or NIC.
Why this is correct
CRC errors are often due to bad cabling.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Outdated NIC driver on the ESXi host.
Why it's wrong here
Driver issues could cause drops but CRC errors point to physical layer.
✗
MTU mismatch between the switch and the VM.
Why it's wrong here
MTU mismatch causes dropped packets but not CRC errors.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse CRC errors (Layer 1 physical corruption) with MTU mismatch or VLAN misconfiguration (Layer 2/3 issues), leading them to select options that address logical configuration rather than physical cabling faults.
Detailed technical explanation
How to think about this question
CRC errors are calculated by the NIC hardware using a polynomial division of the frame's bits; any single-bit corruption during transmission changes the computed CRC, causing the frame to be discarded. In vSphere, the distributed switch reports these counters from the physical NIC's hardware statistics via the ESXi kernel, so they reflect actual physical-layer issues. A common real-world scenario is a bent pin in an RJ45 connector or a marginal SFP+ module that introduces intermittent bit errors under load.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
vSphere Performance and Scaling — This question tests vSphere Performance and Scaling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Faulty physical network cable or NIC. — CRC errors and dropped Rx packets on a distributed virtual switch port indicate physical-layer corruption of frames, typically caused by a faulty cable, damaged NIC, or bad transceiver. These errors occur when the cyclic redundancy check (CRC) computed by the receiver does not match the frame's CRC field, which is a direct symptom of signal integrity issues at Layer 1.
What should I do if I get this VCP-DCV question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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