350-501 Architecture Practice Question
What is the function of the admin plane in IOS XR architecture?
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
✓
It provides a management interface for configuring Secure Domain Routers (SDRs)
The admin plane is a separate management context for administrative tasks such as configuring SDRs, managing hardware, and system-level settings. It provides isolation from the default SDR.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It runs routing protocols for the default SDR
Why it's wrong here
Routing protocols run within SDRs, not the admin plane.
- ✗
It handles data plane forwarding
Why it's wrong here
Forwarding is done by line cards under SDR control.
- ✓
It provides a management interface for configuring Secure Domain Routers (SDRs)
Why this is correct
Correct. The admin plane manages SDR creation and system-level configuration.
- ✗
It is used for customer-facing VPN services
Why it's wrong here
VPN services are configured within SDRs.
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