hardMultiple Select
300-410 Practice Question: Which THREE symptoms indicate a BGP route…
Which THREE symptoms indicate a BGP route dampening issue that is causing routes to be suppressed? (Choose THREE.)
⚠ Common exam trap
The trap is confusing session-level flapping (neighbor up/down) with route-level dampening — candidates pick option A because 'flapping' appears in both, but dampening suppresses routes, not BGP sessions.
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
✓
The show ip bgp command displays the route with a 'd' status code.
Option B is correct because in Cisco IOS the 'd' status code next to a prefix in 'show ip bgp' explicitly means the route is dampened (penalized and suppressed by BGP route dampening). Option C is correct because a dampened route remains in the BGP table but is not installed into the IP routing table (RIB), so it appears in BGP but is absent from 'show ip route'. Option D is correct because 'show ip bgp dampened-paths' is the dedicated command that lists suppressed/dampened prefixes along with their penalty values and reuse/flap timers. Option A is not specific to dampening: neighbor state flapping between Established and Idle indicates a session/transport problem (e.g., hold-timer expiry, TCP failure), not route suppression. Option E is unrelated: 'show ip prefix-list' displays prefix-list configuration used for route filtering, which is a policy mechanism distinct from dampening.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The BGP neighbor state flaps between Established and Idle.
Why it's wrong here
Neighbour flapping between Established and Idle indicates a session or reachability fault, not dampening; dampening suppresses a prefix after repeated withdrawals while the session stays up. Flapping is the symptom you would investigate when troubleshooting unstable BGP peering itself.
- ✓
The show ip bgp command displays the route with a 'd' status code.
Why this is correct
Dampening marks suppressed routes with the 'd' status code in the BGP table, distinguishing them from valid or history entries. Seeing 'd' confirms the prefix is dampened and withheld from advertisement until the penalty decays.
- ✓
The route is present in the BGP table but missing from the IP routing table.
Why this is correct
A dampened route remains in the BGP table but is not installed in the IP routing table, because suppression prevents it from being selected as best. This mismatch between BGP and RIB entries signals dampening.
- ✓
The show ip bgp dampened-paths command shows the suppressed routes.
Why this is correct
The `show ip bgp dampened-paths` command directly lists routes currently suppressed by dampening, displaying the penalty value and reuse time. This output confirms the symptom: routes withdrawn from the BGP table because their accumulated penalty exceeded the suppress threshold, satisfying the stem's requirement to identify suppression evidence.
- ✗
The show ip prefix-list command indicates that routes are being filtered.
Why it's wrong here
Prefix-list filtering is an explicit inbound or outbound policy applied to routes, producing deterministic permit or deny results rather than the penalty-based suppression dampening applies. Prefix lists are the right tool when you deliberately want to filter specific prefixes.
Go deeper
Related to this question
Learn chapter
ACL-Based Traffic Filtering and Policy-Based Routing
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.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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.