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300-410 Practice Question: Consider the following BGP configuration on…

Consider the following BGP configuration on router R2:

router bgp 65002

bgp router-id 2.2.2.2

neighbor 10.2.2.1 remote-as 65001
 neighbor 10.2.2.1 route-map FILTER in

! route-map FILTER deny 10 match ip address prefix-list BLOCKED ! route-map FILTER permit 20 !

ip prefix-list BLOCKED permit 10.0.0.0/8 le 32

Which statement is true about routes received from 10.2.2.1?

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 with prefix 10.0.0.0/8 or more specific are denied; all others are permitted.

The route-map FILTER is applied inbound. Sequence 10 denies any route matching prefix-list BLOCKED (10.0.0.0/8 and more specific). Sequence 20 permits all other routes. Routes with 10.x.x.x are denied.

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 are accepted because the deny statement is misconfigured.

    Why it's wrong here

    The deny statement is correctly configured and will block matched routes.

  • ✓

    Routes with prefix 10.0.0.0/8 or more specific are denied; all others are permitted.

    Why this is correct

    Prefix-list BLOCKED matches 10.0.0.0/8 and any more specific prefix (le 32), so those are denied. Sequence 20 permits the rest.

  • ✗

    Only routes exactly matching 10.0.0.0/8 are denied; other 10.x.x.x routes are permitted.

    Why it's wrong here

    The 'le 32' means any prefix length from 8 to 32 is matched, so all 10.x.x.x routes are denied.

  • ✗

    The route-map is applied outbound, so it affects routes sent to 10.2.2.1.

    Why it's wrong here

    The keyword 'in' means it is applied to inbound updates.

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Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

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