- A
Use the 'aggregate-address' command with the 'summary-only' keyword.
Correct because this command creates an aggregate route and suppresses the advertisement of more-specific routes to BGP peers.
- B
Use the 'network' command to advertise the summary route.
Why wrong: Incorrect because the 'network' command advertises an exact prefix from the routing table, but does not suppress more-specific routes.
- C
Use the 'summary-address' command under the BGP address family.
Why wrong: Incorrect because 'summary-address' is not a valid BGP command; the correct command is 'aggregate-address'.
- D
Use the 'redistribute' command to inject the summary route into BGP.
Why wrong: Incorrect because redistribution does not provide suppression of more-specific routes; it would advertise the summary route but not automatically suppress others.
Quick Answer
The correct command is 'aggregate-address' with the 'summary-only' keyword. This works because the aggregate-address command creates a BGP summary route from the more-specific prefixes learned from eBGP peers, and the summary-only keyword suppresses the advertisement of those individual more-specific routes to any BGP peer, while the router still installs them in its local routing table for forwarding decisions. On the ENCOR 350-401 exam, this scenario tests your understanding of BGP route summarization and the distinction between suppressing advertisements versus removing routes from the RIB—a common trap is confusing 'summary-only' with the 'suppress-map' option, which selectively suppresses routes. Remember that summary-only is an all-or-nothing suppression of the more-specifics, perfect when you want a clean, single summary advertised to iBGP peers. A quick memory tip: think of "summary-only" as "only the summary leaves, but the details stay home."
CCNP BGP Practice Question
This 350-401 practice question tests your understanding of bgp. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A network engineer is configuring BGP on a router that will be used for BGP route summarization. The router receives multiple more-specific prefixes from its eBGP peers. The engineer wants to advertise a summary route to the iBGP peers without advertising the more-specific routes. Which command should the engineer use to suppress the more-specific routes while still installing them in the local routing table?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"which command"Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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
Use the 'aggregate-address' command with the 'summary-only' keyword.
The 'aggregate-address' command with the 'summary-only' keyword in BGP creates a summary route from more-specific prefixes and suppresses the advertisement of those more-specific routes to BGP peers, while still keeping them in the local routing table. This meets the requirement of advertising only the summary to iBGP peers without removing the more-specific routes from the router's own RIB.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use the 'aggregate-address' command with the 'summary-only' keyword.
Why this is correct
Correct because this command creates an aggregate route and suppresses the advertisement of more-specific routes to BGP peers.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use the 'network' command to advertise the summary route.
Why it's wrong here
Incorrect because the 'network' command advertises an exact prefix from the routing table, but does not suppress more-specific routes.
- ✗
Use the 'summary-address' command under the BGP address family.
Why it's wrong here
Incorrect because 'summary-address' is not a valid BGP command; the correct command is 'aggregate-address'.
- ✗
Use the 'redistribute' command to inject the summary route into BGP.
Why it's wrong here
Incorrect because redistribution does not provide suppression of more-specific routes; it would advertise the summary route but not automatically suppress others.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between suppressing routes from advertisement versus removing them from the local table, and candidates mistakenly think 'summary-only' removes the more-specific routes from the router, but it only suppresses their advertisement to BGP peers.
Trap categories for this question
Command / output trap
Incorrect because the 'network' command advertises an exact prefix from the routing table, but does not suppress more-specific routes.
Detailed technical explanation
How to think about this question
The 'aggregate-address' command works by matching the more-specific prefixes in the BGP table and generating a less-specific prefix. The 'summary-only' keyword sets the 'atomic-aggregate' attribute and suppresses all more-specific routes from being advertised to peers, but the router still uses those more-specific routes for forwarding decisions locally. This behavior is defined in RFC 4271 and is commonly used in service provider networks to reduce the BGP table size sent to iBGP peers while maintaining granular routing locally.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 350-401 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 350-401 question test?
BGP — This question tests BGP — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the 'aggregate-address' command with the 'summary-only' keyword. — The 'aggregate-address' command with the 'summary-only' keyword in BGP creates a summary route from more-specific prefixes and suppresses the advertisement of those more-specific routes to BGP peers, while still keeping them in the local routing table. This meets the requirement of advertising only the summary to iBGP peers without removing the more-specific routes from the router's own RIB.
What should I do if I get this 350-401 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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