mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Consider the following configuration on router…
Consider the following configuration on router R2:
!--- R2 configuration
ip prefix-list FILTER seq 5 deny 10.1.0.0/16 le 24 ip prefix-list FILTER seq 10 permit 0.0.0.0/0 le 32
! route-map BGP-IN permit 10 match ip address prefix-list FILTER !
router bgp 65000 neighbor 192.168.1.1 route-map BGP-IN in
!
What is the effect of this configuration?
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
✓
Routes within 10.1.0.0/16 with mask length 24 or shorter are denied; all other routes are permitted.
The prefix-list FILTER denies any prefix within 10.1.0.0/16 with a mask length less than or equal to 24 (i.e., 10.1.0.0/16 through 10.1.255.0/24). The permit statement allows all other prefixes. The route-map BGP-IN calls this prefix-list; since there is only one permit sequence, routes that match the deny statement in the prefix-list are implicitly denied by the route-map. Therefore, routes like 10.1.0.0/16, 10.1.1.0/24, etc., are filtered out.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All routes from neighbor 192.168.1.1 are accepted; the prefix-list is not applied correctly because the route-map only has a permit sequence.
Why it's wrong here
Incorrect. The route-map uses the prefix-list; the deny statement in the prefix-list causes matching routes to be denied.
- ✓
Routes within 10.1.0.0/16 with mask length 24 or shorter are denied; all other routes are permitted.
Why this is correct
Correct. The prefix-list denies 10.1.0.0/16 le 24, which includes /16 to /24 subnets; all other prefixes are permitted.
- ✗
Only routes with mask length exactly 24 are denied; all other routes are permitted.
Why it's wrong here
Incorrect. The 'le 24' means mask length less than or equal to 24, so /16, /17, etc., are also denied.
- ✗
The configuration is incomplete; a route-map must have a deny statement to filter routes.
Why it's wrong here
Incorrect. A route-map can filter using a prefix-list that contains deny statements; the route-map itself only needs permit sequences.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 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 300-410 exam.