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300-410 Practice Question: Best describes the behavior of BGP when an…
Which of the following best describes the behavior of BGP when an 'aggregate-address' command is used without the 'summary-only' keyword?
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 route is advertised, and all more specific routes are also advertised.
Without the summary-only keyword, BGP advertises both the aggregate route and the more specific routes that are in the BGP table.
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 route is advertised, and all more specific routes are also advertised.
Why this is correct
The aggregate-address command without summary-only advertises the aggregate and leaks all more specific component routes alongside it. Neighbours therefore receive both, which is the behaviour distinguishing it from the summary-only variant that suppresses the specifics.
- ✗
Only the aggregate route is advertised.
Why it's wrong here
Without summary-only, BGP advertises both the aggregate and its contributing more-specific routes, so claiming only the aggregate is advertised is false. It tempts because summary-only is the common configuration; that keyword would be correct when suppressing specifics is genuinely required.
- ✗
The aggregate route is not advertised unless a network command exists for it.
Why it's wrong here
The aggregate-address command advertises the summary independently of any network statement, so this condition is false. It tempts administrators conflating aggregate-address with network-based origination; a network command would be correct for injecting a specific prefix that no aggregate covers.
- ✗
The more specific routes are withdrawn from the BGP table.
Why it's wrong here
More-specific routes remain in the BGP table and continue to be advertised; only summary-only suppresses them. It tempts because summarisation is associated with hiding detail; withdrawal would be correct only when summary-only is configured, which is precisely the keyword absent here.
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