The correct answer is that incoming packets matching the VOICE class will have their DSCP set to EF (46), VIDEO to AF41 (34), and all others to default (0). This is because the `set dscp` command within a policy-map directly assigns a specific Differentiated Services Code Point value to packets classified by the class map, overriding any previous markings at Layer 2 or Layer 3. On the ENCOR 350-401 exam, this question tests your ability to read a QoS policy-map and understand that DSCP marking occurs at the ingress interface when the `service-policy input` command is applied. A common trap is confusing DSCP values with their decimal equivalents—remember that EF is always 46, AF41 is 34, and default is 0. For a quick memory tip, think of EF as "Expedited Forwarding" for voice (46), AF41 as "Assured Forwarding" for video (34), and default as "best effort" (0).
CCNP QoS Practice Question
This 350-401 practice question tests your understanding of qos. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Incoming packets matching the VOICE class will have their DSCP set to EF (46), VIDEO to AF41 (34), and all others to default (0).
This policy-map sets DSCP values for incoming traffic based on the class. VOICE traffic is marked as EF (46), VIDEO as AF41 (34), and all other traffic as default (0).
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.
✓
Incoming packets matching the VOICE class will have their DSCP set to EF (46), VIDEO to AF41 (34), and all others to default (0).
Why this is correct
Correct. The 'set dscp' command modifies the DSCP field of matching packets.
Related concept
Read the scenario before looking for a memorised answer.
✗
The policy-map will only mark packets if the interface is congested.
Why it's wrong here
Incorrect. Marking occurs on all packets regardless of congestion.
✗
The configuration is invalid because 'set dscp' cannot be used in a 'service-policy input' direction.
Why it's wrong here
Incorrect. 'set dscp' is commonly used in the input direction to mark packets.
✗
The policy-map will remark the DSCP of outgoing packets on GigabitEthernet0/0.
Why it's wrong here
Incorrect. The 'service-policy input' applies to incoming traffic.
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.
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: Incoming packets matching the VOICE class will have their DSCP set to EF (46), VIDEO to AF41 (34), and all others to default (0). — This policy-map sets DSCP values for incoming traffic based on the class. VOICE traffic is marked as EF (46), VIDEO as AF41 (34), and all other traffic as default (0).
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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