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300-410 Practice Question: Which TWO statements correctly describe the…
Which TWO statements correctly describe the behavior of BGP route summarization using the 'aggregate-address' command? (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
✓
By default, the aggregate route is advertised with the ATOMIC_AGGREGATE attribute set.
The BGP 'aggregate-address' command creates a summary route in the BGP table. By default, the summary is advertised with the ATOMIC_AGGREGATE attribute and the aggregator router ID, but the more specific routes are still advertised unless the 'summary-only' keyword is used. The summary inherits the AS_PATH from the component routes, but the 'as-set' keyword is required to include the AS_PATH information in the aggregate. The summary does not automatically suppress the component routes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
By default, the aggregate route is advertised with the ATOMIC_AGGREGATE attribute set.
Why this is correct
Correct. When an aggregate is created, BGP sets the ATOMIC_AGGREGATE attribute to indicate that the path information might be incomplete.
- ✗
The 'aggregate-address' command automatically suppresses the advertisement of all more specific routes.
Why it's wrong here
Incorrect. By default, the more specific routes are still advertised. The 'summary-only' keyword is required to suppress them.
- ✗
The aggregate route inherits the AS_PATH of the longest matching more specific route.
Why it's wrong here
Incorrect. The aggregate route does not automatically inherit an AS_PATH; the 'as-set' keyword is needed to include the AS_PATH information from the component routes.
- ✗
The 'aggregate-address' command can be used to summarize both IPv4 and IPv6 prefixes in the same configuration.
Why it's wrong here
Incorrect. The 'aggregate-address' command is address-family specific; you must configure it under the appropriate IPv4 or IPv6 address family.
- ✓
The aggregate route is installed in the BGP table only if at least one more specific route exists in the BGP table.
Why this is correct
Correct. BGP creates the aggregate only when there is at least one more specific route in the BGP table that falls within the aggregate prefix.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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