Question 472 of 1,958
mediumMultiple ChoiceObjective-mapped
350-401 Practice Question: Given the following configuration: policy-map…
Given the following configuration:
policy-map MARKING_POLICY
class CRITICAL_DATA
set dscp af31
class BULK_DATA
set dscp af11
class class-default
set dscp default
What is the effect of the set dscp default command in the class-default?
⚠ Common exam trap
Cisco often tests the misconception that 'default' means 'leave the original value unchanged' or that it refers to a specific high-priority default like voice, rather than the actual DSCP value of 0 for best-effort traffic.
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
✓
It sets the DSCP value to 0, which is the default best-effort marking.
The 'set dscp default' command explicitly sets the DSCP field to a value of 0, which corresponds to the default best-effort per-hop behavior (PHB) as defined in RFC 2474. This ensures that any traffic not matching the user-defined classes (CRITICAL_DATA or BULK_DATA) is marked with the lowest priority, which is the standard behavior for class-default in a marking policy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It sets the DSCP value to 0, which is the default best-effort marking.
Why this is correct
DSCP default is 0, used for best-effort traffic.
- ✗
It sets the DSCP value to the original value of the packet, effectively not changing it.
Why it's wrong here
The command explicitly sets it to 0, not preserving the original.
- ✗
It sets the DSCP value to 46, which is the default for voice.
Why it's wrong here
DSCP 46 is EF, not default.
- ✗
It is invalid because class-default cannot have a set action.
Why it's wrong here
Class-default can have set actions; it is valid.
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Last reviewed: Jun 24, 2026
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