Question 1mediumdrag order
Study the full QoS explanation →Question 271 of 2,015
Quick Answer
The correct order for DSCP re-marking at the WAN edge begins with classification, then policy-map creation, outbound application on the interface, packet re-marking, and finally verification using show policy-map interface. This sequence is rooted in the fact that DSCP re-marking is a QoS action applied to outbound traffic, so the router must first identify which packets to re-mark via a class-map, define the new DSCP value in a policy-map, and then attach that policy to the WAN interface in the outbound direction—only at that point does the actual re-marking occur as packets exit, after which you confirm the change with show commands. On the ENCOR 350-401 exam, this drag-and-drop task tests your understanding of the MQC (Modular QoS CLI) workflow and the critical distinction that re-marking happens on egress, not ingress; a common trap is placing verification before the policy is applied or confusing the order of policy-map creation and classification. Remember the mnemonic “Class, Create, Apply, Remark, Verify” to lock in the five-step flow from first to last.
CCNP QoS Architecture Practice Question
This 350-401 practice question tests your understanding of qos architecture. 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.
Drag and drop the steps of DSCP re-marking at enterprise WAN edge into the correct order, from first to last.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
✓
Classify traffic using class-map matching DSCP or ACL
At the enterprise WAN edge, traffic is first classified based on existing markings or other criteria. Then a policy-map is created to set the new DSCP value. The policy is applied outbound on the WAN interface. The router re-marks packets as they exit. Finally, the new DSCP value is verified using show commands.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-401 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this 350-401 question test?
QoS Architecture — This question tests QoS Architecture — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Classify traffic using class-map matching DSCP or ACL — At the enterprise WAN edge, traffic is first classified based on existing markings or other criteria. Then a policy-map is created to set the new DSCP value. The policy is applied outbound on the WAN interface. The router re-marks packets as they exit. Finally, the new DSCP value is verified using show commands.
What should I do if I get this 350-401 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-401 ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Same concept, more angles
1 more ways this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop the steps of DSCP re-marking at enterprise WAN edge into the correct order, from first to last.
medium- ✓ A.Define class maps to match existing DSCP values
- ✓ B.Create policy map with set dscp commands
- ✓ C.Apply service policy to WAN edge interface
- ✓ D.Configure trust boundary on access ports
- ✓ E.Verify re-marking with show policy-map interface
Why A: DSCP re-marking at the WAN edge begins by identifying the trust boundary, then classifying traffic based on existing markings, applying a policy map to re-mark DSCP values, and finally applying the service policy to the interface. This ensures consistent QoS treatment across the WAN.
Last reviewed: Jun 18, 2026
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