Question 1,428 of 2,152

BGP Troubleshooting →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is that R1 is advertising two locally originated routes to neighbor 10.1.1.2. This is correct because the output of the `show bgp neighbors advertised-routes` command reveals two prefixes—10.0.0.0/24 and 192.168.1.0/24—each with a next hop of 0.0.0.0, which in BGP always indicates a route originated on the local router via a `network` statement or redistribution. The weight of 32768 further confirms local origin, while the `*>` status codes show these routes are both valid and best. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to interpret BGP advertisement behavior versus the received routes from `show bgp neighbors received-routes`; a common trap is confusing the two commands or assuming a next hop of 0.0.0.0 means a missing next hop rather than a local origin. A useful memory tip: "Zero next hop means local shop"—when you see 0.0.0.0 in advertised-routes, the route was made right there on the router.

300-410 BGP Troubleshooting Practice Question

This 300-410 practice question tests your understanding of bgp troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 to troubleshoot a BGP Troubleshooting issue:

R1# show bgp neighbors 10.1.1.2 advertised-routes

BGP table version is 14, 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 *> 10.0.0.0/24 0.0.0.0 0 32768 i *> 192.168.1.0/24 0.0.0.0 0 32768 i

Total number of prefixes 2

What does this output indicate?

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.

Question 1mediummultiple choice

Open the full BGP breakdown →

A
R1 is receiving two routes from neighbor 10.1.1.2.
Why wrong: This command shows routes advertised to the neighbor, not received.
B
R1 is advertising two routes to neighbor 10.1.1.2, both originated locally.
The next hop 0.0.0.0 indicates local origin, and the output shows two prefixes.
C
R1 is advertising two routes, but one is suppressed due to dampening.
Why wrong: No 's' status code is shown; both routes are valid and best.
D
R1 is advertising two routes, but the neighbor is not receiving them due to filtering.
Why wrong: The command only shows what R1 is sending; it does not indicate whether the neighbor receives them.

Full breakdown with real-world context →

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

✓

R1 is advertising two routes to neighbor 10.1.1.2, both originated locally.

The show bgp neighbors advertised-routes command shows routes that R1 is advertising to neighbor 10.1.1.2. The output lists two prefixes: 10.0.0.0/24 and 192.168.1.0/24. The next hop of 0.0.0.0 indicates these are locally originated routes (e.g., via network statement or redistribution).

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.

✗
R1 is receiving two routes from neighbor 10.1.1.2.
Why it's wrong here
This command shows routes advertised to the neighbor, not received.
✓
R1 is advertising two routes to neighbor 10.1.1.2, both originated locally.
Why this is correct
The next hop 0.0.0.0 indicates local origin, and the output shows two prefixes.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
✗
R1 is advertising two routes, but one is suppressed due to dampening.
Why it's wrong here
No 's' status code is shown; both routes are valid and best.
✗
R1 is advertising two routes, but the neighbor is not receiving them due to filtering.
Why it's wrong here
The command only shows what R1 is sending; it does not indicate whether the neighbor receives them.

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
This command shows routes advertised to the neighbor, not received.

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?

BGP Troubleshooting — This question tests BGP Troubleshooting — OSPF neighbours must agree on key parameters..

What is the correct answer to this question?

The correct answer is: R1 is advertising two routes to neighbor 10.1.1.2, both originated locally. — The show bgp neighbors advertised-routes command shows routes that R1 is advertising to neighbor 10.1.1.2. The output lists two prefixes: 10.0.0.0/24 and 192.168.1.0/24. The next hop of 0.0.0.0 indicates these are locally originated routes (e.g., via network statement or redistribution).

What should I do if I get this 300-410 question wrong?

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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