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Question 475 of 1,052
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CCNA Practice Question: Which TWO of the following are valid…
This 200-301 practice question tests your understanding of which two of the following are valid…. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 of the following are valid interpretations of errors seen in the output of the 'show interface' command?
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
✓
CRC errors indicate that frames were received with an invalid checksum, often due to cabling issues.
CRC errors indicate data corruption during transmission, often due to faulty cabling or interference. Input errors include runts (frames smaller than 64 bytes) and giants (frames larger than the maximum size). Output errors include collisions and late collisions.
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 indicate that frames were received with an invalid checksum, often due to cabling issues.
Why this is correct
CRC errors occur when the cyclic redundancy check fails, indicating data corruption. This is commonly caused by faulty or noisy cabling.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Runts are frames that are larger than the maximum allowed size.
Why it's wrong here
Runts are frames smaller than 64 bytes (the minimum Ethernet frame size). Giants are frames larger than the maximum size (1518 bytes without VLAN tagging).
- ✗
Giants are frames that are smaller than 64 bytes.
Why it's wrong here
Giants are frames larger than the maximum allowed size. Runts are smaller than 64 bytes.
- ✓
Input errors include runts, giants, CRC errors, and frame errors.
Why this is correct
The 'show interface' command groups runts, giants, CRC errors, and frame errors under 'input errors'.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Flaps indicate that the interface is physically disconnected.
Why it's wrong here
Flaps refer to the interface going up and down repeatedly, not necessarily a permanent disconnection. A single disconnection is not a flap.
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.
✓CRC errors indicate that frames were received with an invalid checksum, often due to cabling issues.Correct answer▾
Why this is correct
CRC errors occur when the cyclic redundancy check fails, indicating data corruption. This is commonly caused by faulty or noisy cabling.
✗Runts are frames that are larger than the maximum allowed size.Wrong answer — click to see why▾
Why this is wrong here
This describes giants, not runts.
✗Giants are frames that are smaller than 64 bytes.Wrong answer — click to see why▾
Why this is wrong here
This describes runts, not giants.
✗Flaps indicate that the interface is physically disconnected.Wrong answer — click to see why▾
Why this is wrong here
Flaps are repeated transitions, not a single disconnection.
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.
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: CRC errors indicate that frames were received with an invalid checksum, often due to cabling issues. — CRC errors indicate data corruption during transmission, often due to faulty cabling or interference. Input errors include runts (frames smaller than 64 bytes) and giants (frames larger than the maximum size). Output errors include collisions and late collisions.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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