- A
The routes are correctly advertised with next hop 0.0.0.0, which is normal for locally originated routes.
Why wrong: Next hop 0.0.0.0 is used in the BGP table for locally originated routes, but when advertised to eBGP peers, the next hop should be changed to the router's interface IP.
- B
The routes are not being advertised to eBGP peers because the next hop is 0.0.0.0, which is invalid for eBGP.
For eBGP, the next hop must be reachable; 0.0.0.0 is not a valid next hop for eBGP advertisements, so the routes may not be installed by the peer.
- C
The routes are being advertised to iBGP peers only, as indicated by the next hop 0.0.0.0.
Why wrong: The next hop 0.0.0.0 is used in the local BGP table, not specifically for iBGP.
- D
The routes are redistributed from an IGP into BGP, and the next hop is correctly set to 0.0.0.0.
Why wrong: Redistributed routes also have next hop 0.0.0.0 locally, but this is not correct for eBGP advertisements.
Quick Answer
The problem is that the routes are being advertised with a next hop of 0.0.0.0, which is invalid for eBGP and prevents them from being installed in the neighbor’s routing table. In BGP, a next hop of 0.0.0.0 indicates a locally originated route, typically injected via a network statement or redistribution, but for eBGP advertisements, the router must update the next hop to its own outbound interface IP address. This output from the `show ip bgp neighbors advertised-routes` command is a classic trap on the Cisco CCNP ENARSI 300-410 exam, testing your understanding of BGP next-hop processing and the rule that eBGP peers reject routes with a next hop of 0.0.0.0 unless the `next-hop-self` command is misapplied or missing. The fix often involves ensuring the correct interface IP is used or applying `neighbor x.x.x.x next-hop-self` under the BGP process. Memory tip: think of 0.0.0.0 as a “local only” sign—it means the route stays home and never leaves for an eBGP neighbor.
300-410 Route Redistribution Practice Question
This 300-410 practice question tests your understanding of route redistribution. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 runs the following command on Router R1:
R1# show ip bgp neighbors 10.2.2.2 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 *> 10.1.1.0/24 0.0.0.0 0 32768 i *> 10.2.2.0/24 0.0.0.0 0 32768 i
Total number of prefixes 2
Based on this output, what is the problem?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 routes are not being advertised to eBGP peers because the next hop is 0.0.0.0, which is invalid for eBGP.
The output shows that R1 is advertising two routes to neighbor 10.2.2.2: 10.1.1.0/24 and 10.2.2.0/24, both with next hop 0.0.0.0. In BGP, a next hop of 0.0.0.0 means the route is originated locally (via network statement or redistribution). The problem is that the next hop should be the router's own interface IP when advertising to an eBGP neighbor, but 0.0.0.0 is used for local routes. This could indicate that the routes are not being advertised correctly to eBGP peers because the next hop is not updated.
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.
- ✗
The routes are correctly advertised with next hop 0.0.0.0, which is normal for locally originated routes.
Why it's wrong here
Next hop 0.0.0.0 is used in the BGP table for locally originated routes, but when advertised to eBGP peers, the next hop should be changed to the router's interface IP.
- ✓
The routes are not being advertised to eBGP peers because the next hop is 0.0.0.0, which is invalid for eBGP.
Why this is correct
For eBGP, the next hop must be reachable; 0.0.0.0 is not a valid next hop for eBGP advertisements, so the routes may not be installed by the peer.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The routes are being advertised to iBGP peers only, as indicated by the next hop 0.0.0.0.
Why it's wrong here
The next hop 0.0.0.0 is used in the local BGP table, not specifically for iBGP.
- ✗
The routes are redistributed from an IGP into BGP, and the next hop is correctly set to 0.0.0.0.
Why it's wrong here
Redistributed routes also have next hop 0.0.0.0 locally, but this is not correct for eBGP advertisements.
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.
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.
What to study next
Got this wrong? Here's your next step.
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.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Route Redistribution — This question tests Route Redistribution — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The routes are not being advertised to eBGP peers because the next hop is 0.0.0.0, which is invalid for eBGP. — The output shows that R1 is advertising two routes to neighbor 10.2.2.2: 10.1.1.0/24 and 10.2.2.0/24, both with next hop 0.0.0.0. In BGP, a next hop of 0.0.0.0 means the route is originated locally (via network statement or redistribution). The problem is that the next hop should be the router's own interface IP when advertising to an eBGP neighbor, but 0.0.0.0 is used for local routes. This could indicate that the routes are not being advertised correctly to eBGP peers because the next hop is not updated.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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