350-501 Architecture Practice Question
Which Cisco SP router platform runs IOS XR and is designed for the aggregation layer with high-density 10GE/100GE interfaces?
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
✓
Cisco ASR 9000
The Cisco ASR 9000 series is optimized for the aggregation layer with dense 10GE/100GE ports and runs IOS XR.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cisco ISR 4000
Why it's wrong here
ISR is enterprise branch, not SP aggregation.
- ✓
Cisco ASR 9000
Why this is correct
ASR 9000 is the correct aggregation platform.
- ✗
Cisco CRS
Why it's wrong here
CRS is a core router, not typically used at aggregation.
- ✗
Cisco NCS 5500
Why it's wrong here
NCS 5500 is also aggregation but this is a distractor.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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