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CCNA Practice Question: Which TWO statements correctly describe the…
This 200-301 practice question tests your understanding of 200-301 exam topics. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Which TWO statements correctly describe the causes or implications of CRC errors, runts, giants, or output errors as seen in the output of 'show interface' or 'show interface status'?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A high number of runts on an interface typically indicates excessive collisions or a faulty NIC.
CRC errors indicate data corruption during transmission, often caused by faulty cabling or electromagnetic interference. Output errors, such as late collisions or underruns, can be caused by duplex mismatches or insufficient buffer space. Runts (frames smaller than 64 bytes) can result from collisions or faulty NICs, while giants (frames larger than the maximum size) are typically due to misconfigured NICs or software issues.
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.
- ✗
CRC errors are always caused by a faulty switch port and require port replacement.
Why it's wrong here
CRC errors are usually caused by cabling issues or electromagnetic interference, not necessarily a faulty port.
- ✓
A high number of runts on an interface typically indicates excessive collisions or a faulty NIC.
Why this is correct
Runts are frames smaller than 64 bytes and often result from collisions (e.g., in half-duplex) or a malfunctioning NIC that generates undersized frames.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Giants are frames that exceed the maximum transmission unit (MTU) and are always discarded by the switch.
Why it's wrong here
Giants are frames larger than the maximum allowed size, but some switches may forward them if configured for jumbo frames; they are not always discarded.
- ✓
Output errors, including late collisions, can be caused by a duplex mismatch between the switch and the connected device.
Why this is correct
A duplex mismatch (e.g., one side full-duplex, the other half-duplex) leads to late collisions and other output errors due to timing issues.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'show controllers' command provides a detailed view of CRC errors but does not show runts or giants.
Why it's wrong here
'show controllers' displays hardware-level details including CRC errors, but it can also show runts, giants, and other frame errors depending on the platform.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓A high number of runts on an interface typically indicates excessive collisions or a faulty NIC.Correct answer▾
Why this is correct
Runts are frames smaller than 64 bytes and often result from collisions (e.g., in half-duplex) or a malfunctioning NIC that generates undersized frames.
✗CRC errors are always caused by a faulty switch port and require port replacement.Wrong answer — click to see why▾
Why this is wrong here
This statement is too absolute; CRC errors often stem from Layer 1 issues like bad cables or noise, not always a defective port.
✗Giants are frames that exceed the maximum transmission unit (MTU) and are always discarded by the switch.Wrong answer — click to see why▾
Why this is wrong here
The statement is too definitive; giants can be forwarded if jumbo frame support is enabled.
✗The 'show controllers' command provides a detailed view of CRC errors but does not show runts or giants.Wrong answer — click to see why▾
Why this is wrong here
This statement is incorrect because 'show controllers' often includes runt and giant counters on many Cisco platforms.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
'show controllers' displays hardware-level details including CRC errors, but it can also show runts, giants, and other frame errors depending on the platform.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 practitioner preparing for the 200-301 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: A high number of runts on an interface typically indicates excessive collisions or a faulty NIC. — CRC errors indicate data corruption during transmission, often caused by faulty cabling or electromagnetic interference. Output errors, such as late collisions or underruns, can be caused by duplex mismatches or insufficient buffer space. Runts (frames smaller than 64 bytes) can result from collisions or faulty NICs, while giants (frames larger than the maximum size) are typically due to misconfigured NICs or software issues.
What should I do if I get this 200-301 question wrong?
Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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