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300-410 Practice Question: Which TWO statements about route summarization in…
Which TWO statements about route summarization in BGP are true? (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
✓
The 'aggregate-address' command creates a summary route in the BGP table.
Option A is correct because the Cisco IOS 'aggregate-address <prefix> <mask>' command under the BGP router configuration creates an aggregate (summary) entry in the BGP table, provided at least one more-specific route from the same AS exists in the BGP table. Option B is correct because adding the 'summary-only' keyword to 'aggregate-address' advertises only the aggregate and suppresses the more-specific component routes to all neighbors, which is the standard way to prevent the specifics from being advertised. Option C is wrong because the 'network' command injects an exact prefix into BGP (it does not perform summarization or create an aggregate). Option D is wrong because suppression of more-specifics is achieved with the 'summary-only' keyword (or with 'suppress-map' for selective suppression), not by a route-map requirement. Option E is wrong because route summarization via 'aggregate-address' can be configured on any BGP speaker, not only on route reflectors.
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 'aggregate-address' command creates a summary route in the BGP table.
Why this is correct
The aggregate-address command injects a summary prefix into the BGP table, provided at least one more specific component route exists in the table; it does not by itself suppress those components unless summary-only is added.
- ✓
The 'summary-only' keyword can be used with 'aggregate-address' to suppress more specific routes.
Why this is correct
The summary-only keyword on aggregate-address suppresses advertisement of all more specific component routes, leaving only the aggregate. Without it, BGP advertises both the summary and the specifics, so this satisfies the requirement to filter the contributing prefixes.
- ✗
The 'network' command is used to create a summary route in BGP.
Why it's wrong here
The 'network' command injects a prefix into the BGP table only when a matching route already exists in the RIB; it does not aggregate component routes into a summary. It is tempting because it originates prefixes, which suits advertising a static or connected subnet, but summarisation requires the 'aggregate-address' command instead.
- ✗
BGP summarization requires a route-map to suppress more specific routes.
Why it's wrong here
BGP summarisation is achieved with the aggregate-address command, which can suppress more specifics via the summary-only keyword; a route-map is not required. It is tempting because route-maps commonly filter and manipulate BGP attributes, and would be correct when selectively setting communities or metrics on advertised routes.
- ✗
Route summarization in BGP can only be configured on route reflectors.
Why it's wrong here
Summarisation is configured per BGP process or per neighbour with 'aggregate-address', on any router, not solely on route reflectors. Route reflectors are tempting because they centralise iBGP prefix propagation and reduce peer meshes, but that is a separate scaling mechanism from summarisation itself.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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