The correct answer is that the aggregate-address 192.168.0.0 255.255.252.0 summary-only command on router R3 will advertise the aggregate 192.168.0.0/22 to neighbor 10.1.1.1 while suppressing all more specific routes from being sent. This works because the summary-only keyword explicitly tells BGP to filter out any component prefixes that fall within the aggregate range, ensuring only the summarized route is propagated. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding of BGP route summarization and the critical distinction between creating an aggregate and controlling its advertisement; a common trap is assuming the aggregate is automatically generated without the network command or that summary-only is required for the aggregate to exist. Remember the memory tip: "summary-only silences the specifics" — it does not create the route, it just mutes the details.
300-410 Route Summarization Practice Question
This 300-410 practice question tests your understanding of route summarization. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
Incorrect. The aggregate-address command does not create static routes.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
Route Summarization — This question tests Route Summarization — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
About these practice questions
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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.
Last reviewed: Jun 18, 2026
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