350-501 Architecture Practice Question
An SP is designing a metro Ethernet network using Q-in-Q. A customer uses VLAN ID 100 on their network, and the SP assigns service VLAN 200. Which frame format is used on the SP network?
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
✓
Double tag: outer 200, inner 100
Q-in-Q adds an outer (service) VLAN tag (200) while preserving the inner (customer) VLAN tag (100).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Single tag: VLAN 100
Why it's wrong here
Q-in-Q uses two tags.
- ✗
Double tag: outer 100, inner 200
Why it's wrong here
The outer tag is the service provider's, typically higher priority.
- ✓
Double tag: outer 200, inner 100
Why this is correct
Outer tag is service VLAN, inner is customer VLAN.
- ✗
Single tag: VLAN 200
Why it's wrong here
Customer VLAN is preserved.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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