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300-410 Practice Question: Which TWO configuration steps are required to…
Which TWO configuration steps are required to filter routes using a prefix-list in a route-map applied to a BGP neighbor? (Choose TWO.)
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
✓
Configure a prefix-list with permit or deny statements for the desired prefixes.
To filter routes, you must define the prefix-list to match the desired prefixes, then create a route-map that uses the prefix-list in a match statement. The route-map is then applied to the BGP neighbor. Defining an access-list is an alternative but not required if using a prefix-list. The 'network' command under BGP is for originating routes, not filtering. The 'distribute-list' command is a separate method and does not use a route-map.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure a prefix-list with permit or deny statements for the desired prefixes.
Why this is correct
The prefix-list defines which prefixes to match.
- ✓
Create a route-map that uses the 'match ip address prefix-list' command to reference the prefix-list.
Why this is correct
The route-map uses the prefix-list to match routes and then permits or denies them.
- ✗
Define an extended access-list to match the prefixes.
Why it's wrong here
An access-list is not required; the prefix-list itself is used in the route-map.
- ✗
Apply the route-map to the BGP neighbor using the 'neighbor x.x.x.x route-map' command.
Why it's wrong here
This step is also required, but the question asks for TWO steps; the application is the third step.
- ✗
Use the 'network' command under BGP to advertise the filtered routes.
Why it's wrong here
The 'network' command originates routes, it does not filter them.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
BGP Prefix Filtering
BGP Prefix Filtering is the practice of controlling which network routes (prefixes) a router accepts or advertises to its BGP neighbors, preventing unwanted or harmful routes from spreading across the internet.
Key term
ACL for Routing Protocols
An ACL for Routing Protocols is a set of rules used to filter routing updates between routers, controlling which network routes are advertised or accepted to improve security and stability.
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Written by Johnson Ajibi, MSc IT Security
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