Question 1,374 of 2,015

QoS →mediumMultiple ChoiceObjective-mapped

350-401 QoS Practice Question

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 R1:

R1# show policy-map interface GigabitEthernet0/1

GigabitEthernet0/1

Service-policy output: QOS_POLICY

Class-map: VOICE (match-any) 0 packets, 0 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: ip dscp ef (46) Queueing queue limit 64 packets (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 0/0 police cir 1000000 bc 15625 be 15625 conformed 0 packets, 0 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop

Class-map: class-default (match-any) 100 packets, 10000 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: any Queueing queue limit 64 packets (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 100/10000

Based on this output, what can be concluded?

Question 1mediummultiple choice

Study the full QoS explanation →

A
Voice traffic is being marked with DSCP EF and is being policed at 1 Mbps.
Why wrong: The voice class shows 0 packets, so no voice traffic has been matched.
B
Voice traffic is not being classified because no packets match the VOICE class.
The VOICE class has 0 packets, meaning no traffic matched the DSCP EF criteria.
C
All traffic is being dropped due to the police action.
Why wrong: The class-default shows 100 packets output, so traffic is being forwarded.
D
The policy-map is applied in the input direction.
Why wrong: The output says 'Service-policy output', so it is applied outbound.

Full breakdown with real-world context →

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

✓

Voice traffic is not being classified because no packets match the VOICE class.

The output shows that the VOICE class is matching DSCP EF (46) and has a police command with a CIR of 1 Mbps. Since no packets have been matched (0 packets, 0 bytes), the voice traffic is not being classified. This indicates that either no voice traffic is present or the DSCP marking is not EF. The class-default is handling all traffic.

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.

✗
Voice traffic is being marked with DSCP EF and is being policed at 1 Mbps.
Why it's wrong here
The voice class shows 0 packets, so no voice traffic has been matched.
✓
Voice traffic is not being classified because no packets match the VOICE class.
Why this is correct
The VOICE class has 0 packets, meaning no traffic matched the DSCP EF criteria.
Related concept
Read the scenario before looking for a memorised answer.
✗
All traffic is being dropped due to the police action.
Why it's wrong here
The class-default shows 100 packets output, so traffic is being forwarded.
✗
The policy-map is applied in the input direction.
Why it's wrong here
The output says 'Service-policy output', so it is applied outbound.

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 voice class shows 0 packets, so no voice traffic has been matched.

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.

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FAQ

Questions learners often ask

What does this 350-401 question test?

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: Voice traffic is not being classified because no packets match the VOICE class. — The output shows that the VOICE class is matching DSCP EF (46) and has a police command with a CIR of 1 Mbps. Since no packets have been matched (0 packets, 0 bytes), the voice traffic is not being classified. This indicates that either no voice traffic is present or the DSCP marking is not EF. The class-default is handling all traffic.

What should I do if I get this 350-401 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 18, 2026

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