350-501 Security and Services Practice Question
An engineer is configuring BGP prefix filtering on a provider edge router to prevent BGP hijacking. They want to allow only customer prefixes that are registered in the RIR database. What is the most effective method to automate this filtering?
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
✓
RPKI Origin Validation using RTR
RPKI with Origin Validation uses ROAs to validate origin AS, which can be automated. IRR-based filtering with prefix-lists requires manual updates, while RPKI can be automated via RTR.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
RPKI Origin Validation using RTR
Why this is correct
RPKI provides automated validation of prefix origin using ROAs.
- ✗
AS_PATH filtering based on customer AS
Why it's wrong here
AS_PATH filtering doesn't verify prefix registration.
- ✗
Manual prefix-lists based on IRR data
Why it's wrong here
Manual prefix-lists require constant updates and are error-prone.
- ✗
BGP community tagging with customer AS
Why it's wrong here
Community tagging doesn't validate prefix ownership.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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