350-501 Architecture Practice Question
In IOS XR architecture, what is the role of the Secure Domain Router (SDR)?
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 isolation for routing protocols and forwarding tables.
An SDR provides a logical partitioning of router resources, allowing multiple independent virtual routers within a single physical chassis.
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 handles all packet forwarding in hardware.
Why it's wrong here
Forwarding is handled by line cards.
- ✗
It is used for OSPF only.
Why it's wrong here
SDR can run any routing protocol.
- ✓
It provides isolation for routing protocols and forwarding tables.
Why this is correct
SDR creates separate routing domains.
- ✗
It manages the admin plane for all line cards.
Why it's wrong here
Admin plane is separate from SDR.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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