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300-410 Practice Question: An engineer is troubleshooting BGP convergence…
An engineer is troubleshooting BGP convergence issues. Which THREE commands can be used to verify BGP path selection and best path criteria? (Choose THREE.)
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
✓
show ip bgp <prefix>
Option A, `show ip bgp <prefix>`, is correct because it displays all BGP paths for a specific prefix along with the best-path marker (`>`), the locally generated marker (`*`), and the BGP attributes (weight, local preference, AS path, origin, MED) used in the best-path selection algorithm. Option C, `show ip bgp neighbors <neighbor> routes`, is correct because it lists the routes advertised by or received from a specific neighbor, letting the engineer verify which paths that neighbor is contributing to the BGP table and how they factor into path selection. Option D, `show ip bgp`, is correct because it dumps the entire BGP table with best-path indicators and attributes, which is the primary command for inspecting path selection and best-path criteria across all prefixes. Option B, `show ip route bgp`, only shows the BGP routes already installed in the routing table (post-selection), so it does not reveal the candidate paths or the attributes used to choose the best path. Option E, `show ip bgp community <community>`, filters the BGP table by community value and is useful for community-based policy verification, but it does not directly show best-path criteria or path selection details.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
show ip bgp <prefix>
Why this is correct
show ip bgp <prefix> displays every path for that prefix with the attributes BGP uses for best-path selection, including weight, local preference, AS-path length, origin and MED. This satisfies the stem's requirement to verify path selection and best-path criteria.
- ✗
show ip route bgp
Why it's wrong here
show ip route bgp displays installed BGP routes in the routing table, not the path-selection attributes used to choose a best path. It is tempting for confirming reachability, but verifying best-path criteria requires show ip bgp and its attribute output.
- ✓
show ip bgp neighbors <neighbor> routes
Why this is correct
This command displays routes received from a specific neighbour, including path attributes and which route BGP selected as best. It therefore verifies both path selection criteria and the resulting best path for that neighbour, addressing the convergence troubleshooting scenario.
- ✓
show ip bgp
Why this is correct
show ip bgp displays the BGP table with path attributes — AS path, local preference, origin, MED and weight — letting the engineer verify which path was selected and why. It directly exposes best-path criteria.
- ✗
show ip bgp community <community>
Why it's wrong here
This displays prefixes matching a community value, not the attributes BGP weighs when selecting a best path. It is tempting because community is a genuine BGP attribute, and the command is correct when filtering or verifying route tagging rather than path selection.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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