Question 1,693 of 2,015

QoS →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is that all traffic is being handled by class-default, which effectively gets 100% of the bandwidth. This conclusion follows directly from interpreting the show policy-map interface output, which reveals zero packets matched in both the VOICE and DATA classes, while class-default shows 100 packets processed. The VOICE class is configured with strict priority queuing and a police command, but with no matching traffic, those mechanisms are idle; similarly, the DATA class has no packets despite its bandwidth remaining percent 50 allocation. On the ENCOR 350-401 exam, this scenario tests your ability to read show policy-map interface statistics and recognize that classification failures cause all traffic to fall into class-default, which then consumes all available bandwidth regardless of configured percentages. A common trap is assuming the bandwidth remaining percent commands divide bandwidth evenly, but they only apply to traffic actually classified into those classes. Memory tip: “Zero match means default gets the batch”—if a class shows zero packets, it cannot claim any bandwidth, so class-default takes everything.

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 R2:

R2# show class-map

Class Map match-any VOICE (id 1) Match ip dscp ef (46) Class Map match-any DATA (id 2) Match ip dscp af31 (26) Class Map match-any class-default (id 0) Match any

R2# show policy-map

Policy Map QOS_POLICY Class VOICE priority level 1 police cir 1000000 bc 15625 be 15625 Class DATA bandwidth remaining percent 50 Class class-default bandwidth remaining percent 50

R2# 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 strict priority 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: DATA (match-any) 0 packets, 0 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: ip dscp af31 (26) Queueing (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 0/0 bandwidth remaining percent 50 (0 kbps)

Class-map: class-default (match-any) 100 packets, 10000 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: any Queueing (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 100/10000 bandwidth remaining percent 50 (0 kbps)

Based on this output, what can be concluded?

Question 1hardmultiple choice

Study the full QoS explanation →

A
Voice traffic is being prioritized with strict priority queuing and policed at 1 Mbps.
Why wrong: No voice traffic is being matched (0 packets), so the priority and police are not applied.
B
Data traffic is being guaranteed 50% of the remaining bandwidth.
Why wrong: DATA class has 0 packets, so no data traffic is being classified.
C
All traffic is being handled by class-default, which gets 100% of the bandwidth.
Only class-default has traffic (100 packets), and since it is the only class with traffic, it uses all bandwidth.
D
The police command on VOICE is causing drops for voice traffic.
Why wrong: No voice traffic is matched, so no drops occur.

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

✓

All traffic is being handled by class-default, which gets 100% of the bandwidth.

The VOICE class uses strict priority queuing (priority level 1). However, with 0 packets matched, no voice traffic is being classified. The DATA class also shows 0 packets. All traffic falls into class-default. The bandwidth remaining percent commands allocate remaining bandwidth, but since only class-default has traffic, it effectively gets 100% of the bandwidth. The police command on VOICE is not affecting anything because no packets match.

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 prioritized with strict priority queuing and policed at 1 Mbps.
Why it's wrong here
No voice traffic is being matched (0 packets), so the priority and police are not applied.
✗
Data traffic is being guaranteed 50% of the remaining bandwidth.
Why it's wrong here
DATA class has 0 packets, so no data traffic is being classified.
✓
All traffic is being handled by class-default, which gets 100% of the bandwidth.
Why this is correct
Only class-default has traffic (100 packets), and since it is the only class with traffic, it uses all bandwidth.
Related concept
Read the scenario before looking for a memorised answer.
✗
The police command on VOICE is causing drops for voice traffic.
Why it's wrong here
No voice traffic is matched, so no drops occur.

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 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: All traffic is being handled by class-default, which gets 100% of the bandwidth. — The VOICE class uses strict priority queuing (priority level 1). However, with 0 packets matched, no voice traffic is being classified. The DATA class also shows 0 packets. All traffic falls into class-default. The bandwidth remaining percent commands allocate remaining bandwidth, but since only class-default has traffic, it effectively gets 100% of the bandwidth. The police command on VOICE is not affecting anything because no packets match.

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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