hardMultiple Choice
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip bgp neighbors 10.1.1.1 advertised-routes
BGP table version is 10, local router ID is 1.1.1.1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path *> 10.0.0.0/8 0.0.0.0 0 32768 i *> 10.1.0.0/16 0.0.0.0 0 32768 i *> 10.1.1.0/24 0.0.0.0 0 32768 i *> 10.1.2.0/24 0.0.0.0 0 32768 i
Based on this output, what is a problem with the BGP advertisements?
⚠ Common exam trap
The trap here is that candidates might see the next-hop 0.0.0.0 and incorrectly assume it is a problem, or they might overlook the overlapping prefixes because the output looks normal at first glance. 300-410 often tests the ability to interpret BGP show command output and identify subtle configuration issues like missing 'summary-only'.
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 router is advertising overlapping prefixes, including both summary and specific routes.
The output shows that R1 is advertising four prefixes: 10.0.0.0/8, 10.1.0.0/16, 10.1.1.0/24, and 10.1.2.0/24. These are overlapping because 10.0.0.0/8 encompasses 10.1.0.0/16, which in turn encompasses the two /24s. Advertising both summary and more-specific routes can cause suboptimal routing and increase BGP table size. The correct answer identifies this as the problem.
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 router is not advertising any routes.
Why it's wrong here
It is advertising multiple routes.
- ✓
The router is advertising overlapping prefixes, including both summary and specific routes.
Why this is correct
Advertising both 10.0.0.0/8 and its more-specific components (10.1.0.0/16, 10.1.1.0/24, 10.1.2.0/24) creates overlapping prefixes. Receivers will prefer the longest match, so the /8 summary is effectively shadowed, wasting table space and risking inconsistent forwarding. Route aggregation or suppression of the specifics is required.
- ✗
The router is only advertising the summary route.
Why it's wrong here
Four distinct prefixes appear, including the /24s, so no summarisation is occurring. It is tempting because advertising only 10.0.0.0/8 would be a summary-only configuration, and that would be correct if the output showed just the classful aggregate with the more specific routes suppressed.
- ✗
The router is using incorrect next-hop.
Why it's wrong here
Next-hop 0.0.0.0 is normal for locally originated routes.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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.