350-501 Security and Services Practice Question
An SP wants to filter BGP prefixes received from a customer to prevent hijacking. Which two tools can be used together on the provider edge router to implement inbound prefix 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
✓
Prefix-list and route-map
Prefix-lists and route-maps are commonly used together to match and filter BGP prefixes. Prefix-lists define the prefixes, and route-maps apply them in BGP neighbor statements.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Prefix-list and route-map
Why this is correct
This combination allows matching prefixes and applying actions like permit/deny.
- ✗
Distribute-list and ACL
Why it's wrong here
Distribute-list can filter prefixes but is less common; the question asks for two tools used together, and prefix-list + route-map is standard.
- ✗
RPKI and BGP community
Why it's wrong here
RPKI validates origin AS, not prefix filtering.
- ✗
AS-path access-list and community-list
Why it's wrong here
These filter based on AS path or community, not prefix.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.