350-501 Automation and Quality of Services Practice Question
An SP engineer is configuring QoS on a PE router for MPLS traffic. The core network uses MPLS EXP bits for QoS. Which TWO methods can be used to set MPLS EXP bits based on IP DSCP? (Select two.)
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
✓
Use a policy-map with 'set mpls experimental' command.
On Cisco routers, you can use 'set mpls experimental imposition' to set EXP on the imposed label, or use a QoS policy with 'set mpls experimental' in a policy-map.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure 'mpls qos enforce' on the interface.
Why it's wrong here
This enables QoS based on MPLS EXP, not setting it.
- ✗
Configure 'mpls ip' to automatically copy DSCP to EXP.
Why it's wrong here
No automatic copy; requires configuration.
- ✓
Use a policy-map with 'set mpls experimental' command.
Why this is correct
Policy-map can set EXP bits based on classification.
- ✗
Apply 'qos-group' to DSCP mapping.
Why it's wrong here
qos-group is internal to the router.
- ✓
Use 'set mpls experimental imposition' under interface.
Why this is correct
This sets EXP on the imposed label for all packets.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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