350-501 Security and Services Practice Question
An SP is implementing RPKI to validate BGP origin AS. After configuring RPKI-to-Router (RTR) and setting BGP origin validation, a route is marked as 'invalid'. What action does BGP default take for invalid routes?
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 route is not installed in the routing table unless it is the only path
By default, BGP does not drop invalid routes; they are considered but with a lower preference (typically not installed in the routing table if a valid route exists). To drop invalid routes, explicit policy is needed.
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 route is installed with a lower local preference
Why it's wrong here
It is not automatically installed; it is not preferred over valid/not-found.
- ✓
The route is not installed in the routing table unless it is the only path
Why this is correct
Invalid routes are not selected if any valid or not-found route exists; they may be used as a last resort.
- ✗
The route is treated as valid but with a lower preference
Why it's wrong here
Invalid routes are not treated as valid; they are less preferred.
- ✗
The route is dropped and not considered for best path selection
Why it's wrong here
It is considered but not selected if a better route exists.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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