350-501 Architecture Practice Question
In Cisco IOS XR architecture, using Secure Domain Routers (SDRs) allows partitioning a physical router into multiple logical routers. Which statement about admin plane and SDRs is correct?
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
✓
The admin plane is a separate SDR that manages hardware resources and system-level functions, while the default SDR handles routing and forwarding.
The admin plane is a special SDR used for managing the system (e.g., hardware inventory, shared resources). Default SDR is the primary forwarding SDR, but admin SDR is separate.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The admin plane runs only on route processor cards, while default SDR runs on line cards.
Why it's wrong here
Admin plane can run on any designated card, not just RP.
- ✗
The admin plane and default SDR are the same logical entity and share all configuration.
Why it's wrong here
Admin plane is a separate SDR for system management.
- ✓
The admin plane is a separate SDR that manages hardware resources and system-level functions, while the default SDR handles routing and forwarding.
Why this is correct
Admin plane is dedicated to system management; default SDR is for data plane and control plane services.
- ✗
SDRs are only supported on Cisco CRS, not on ASR 9000.
Why it's wrong here
SDRs are supported on both CRS and ASR 9000 platforms.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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