This 350-401 practice question tests your understanding of qos. 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.
A network engineer runs the following command on Router R7:
R7# show mls qos interface GigabitEthernet0/1 statistics
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
All packets are being queued without drops at egress.
The ingress statistics show that packets with DSCP EF, AF31, and other values are being classified and no policing drops occur. The egress statistics show that all packets are queued without drops. This indicates that the QoS policy is not dropping any traffic, and the interface is likely not congested.
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.
✗
Packets with DSCP EF are being dropped at ingress.
Why it's wrong here
The dropped column for EF is 0.
✓
All packets are being queued without drops at egress.
Why this is correct
The egress statistics show queued packets equal to incoming, with zero drops.
Related concept
Read the scenario before looking for a memorised answer.
✗
Policing is dropping packets with DSCP AF31.
Why it's wrong here
The dropped column for AF31 is 0.
✗
The interface is not using any QoS policy.
Why it's wrong here
The statistics show classification, indicating a policy is applied.
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
The statistics show classification, indicating a policy is applied.
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 350-401 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 350-401 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.
QoS — This question tests QoS — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: All packets are being queued without drops at egress. — The ingress statistics show that packets with DSCP EF, AF31, and other values are being classified and no policing drops occur. The egress statistics show that all packets are queued without drops. This indicates that the QoS policy is not dropping any traffic, and the interface is likely not congested.
What should I do if I get this 350-401 question wrong?
Identify which 350-401 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.
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Question Discussion
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