350-501 Architecture Practice Question
Which Cisco router platform is designed for the aggregation layer and runs IOS XR, supporting both L2 and L3 services at high density?
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 ASR 9000 is a widely used aggregation router with IOS XR and supports L2/L3 services. CRS is core, NCS 5500 is edge/aggregation but more focused on 100GE, and ISR is enterprise.
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 NCS 5500
Why it's wrong here
NCS 5500 is often used at the edge/aggregation but ASR 9000 is more traditional for aggregation.
- ✗
Cisco CRS
Why it's wrong here
CRS is a core router.
- ✓
Cisco ASR 9000
Why this is correct
ASR 9000 is optimized for the aggregation layer with IOS XR.
- ✗
Cisco ISR 4000
Why it's wrong here
ISR is for enterprise branch, not service provider aggregation.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.