350-501 Architecture Practice Question
Which Cisco router platform is designed for high-density 100GE and uses IOS XR, making it suitable for the core/backbone of a service provider 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
✓
Cisco CRS
Cisco CRS (Carrier Routing System) is a high-end core router supporting high-density 100GE and running 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.
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Cisco NCS 5500
Why it's wrong here
NCS 5500 is used for high-density 100GE but often in aggregation.
- ✓
Cisco CRS
Why this is correct
CRS is designed for core backbone with massive scale.
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Cisco ASR 9000
Why it's wrong here
ASR 9000 is typically an aggregation router.
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Cisco ISR 4400
Why it's wrong here
ISR is for enterprise branch.
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Written by Johnson Ajibi, MSc IT Security
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