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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.
In BGP, the 'aggregate-address' command creates a summary route in the BGP table, and it can suppress more specific routes using the 'summary-only' keyword. The 'network' command is used to advertise a specific prefix, not to summarize. The 'aggregate-address' command does not require a route-map to suppress specifics; the 'summary-only' keyword does that. BGP summarization can be done on any BGP speaker, not just 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
This command is used to create an aggregate route in BGP, which can then be advertised to peers.
- ✓
The 'summary-only' keyword can be used with 'aggregate-address' to suppress more specific routes.
Why this is correct
When 'summary-only' is added, only the aggregate route is advertised, and the more specific routes are suppressed.
- ✗
The 'network' command is used to create a summary route in BGP.
Why it's wrong here
The 'network' command advertises a specific prefix that must exist in the routing table; it does not create a summary.
- ✗
BGP summarization requires a route-map to suppress more specific routes.
Why it's wrong here
The 'summary-only' keyword directly suppresses specifics without needing a route-map.
- ✗
Route summarization in BGP can only be configured on route reflectors.
Why it's wrong here
Any BGP speaker can configure route summarization, not just route reflectors.
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