mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Examine this BGP configuration on router R3:…
Examine this BGP configuration on router R3:
router bgp 65001 neighbor 10.1.1.1 remote-as 65002
address-family ipv4
network 192.168.0.0 mask 255.255.252.0
aggregate-address 192.168.0.0 255.255.252.0 summary-only
What is the effect of the 'aggregate-address' command with 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
✓
It advertises the aggregate 192.168.0.0/22 and suppresses all more specific routes from being advertised to neighbor 10.1.1.1.
The aggregate-address command creates an aggregate route in BGP. The summary-only keyword suppresses more specific routes from being advertised.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It advertises the aggregate 192.168.0.0/22 and suppresses all more specific routes from being advertised to neighbor 10.1.1.1.
Why this is correct
Correct. The summary-only keyword ensures only the aggregate is advertised, not the specifics.
- ✗
It advertises both the aggregate and all more specific routes.
Why it's wrong here
Incorrect. summary-only suppresses specifics.
- ✗
It creates a static route for the aggregate.
Why it's wrong here
Incorrect. The aggregate-address command does not create static routes.
- ✗
It removes all more specific routes from the BGP table.
Why it's wrong here
Incorrect. It only suppresses advertisement, not removal from the table.
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Same concept, more angles
3 more ways this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Given this partial configuration on router R6: router bgp 65000 neighbor 192.168.1.1 remote-as 65001 address-family ipv4 network 172.16.0.0 mask 255.255.0.0 aggregate-address 172.16.0.0 255.255.0.0 What is missing if the administrator wants to ensure that only the aggregate route is advertised to neighbor 192.168.1.1?
medium- ✓ A.The 'summary-only' keyword is missing from the aggregate-address command.
- B.The 'network' command should be removed.
- C.The 'synchronization' command must be enabled.
- D.The 'neighbor 192.168.1.1 route-map' command is needed.
Why A: The aggregate-address command without the summary-only keyword will advertise both the aggregate and the more specific routes. To suppress the specifics, the summary-only keyword is required.
Variation 2. Which of the following best describes the behavior of BGP when an 'aggregate-address' command is used without the 'summary-only' keyword?
medium- ✓ A.The aggregate route is advertised, and all more specific routes are also advertised.
- B.Only the aggregate route is advertised.
- C.The aggregate route is not advertised unless a network command exists for it.
- D.The more specific routes are withdrawn from the BGP table.
Why A: Without the summary-only keyword, BGP advertises both the aggregate route and the more specific routes that are in the BGP table.
Variation 3. Which TWO statements about route summarization in BGP are true? (Choose TWO.)
medium- ✓ A.The 'aggregate-address' command creates a summary route in the BGP table.
- ✓ B.The 'summary-only' keyword can be used with 'aggregate-address' to suppress more specific routes.
- C.The 'network' command is used to create a summary route in BGP.
- D.BGP summarization requires a route-map to suppress more specific routes.
- E.Route summarization in BGP can only be configured on route reflectors.
Why A: 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.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.