Question 45 of 2,152

BGP Troubleshooting →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is that R1 is receiving two routes from neighbor 10.1.1.2, both originating from AS 65001. This is correct because the `show bgp neighbors received-routes` command displays all routes that have been advertised by the specified neighbor, regardless of whether they are installed in the routing table; the output shows two prefixes with a next hop of 10.1.1.2, and the `*>` status codes confirm they are both valid and best, meaning they are actively used. On the Cisco CCNP ENARSI 300-410 exam, this command is frequently tested to distinguish between `received-routes` (all routes sent by the neighbor) and `routes` (only those installed in the BGP table), with a common trap being that `received-routes` requires the `soft-reconfiguration inbound` to be configured or it will return an empty output. Remember the memory tip: “Received is raw, routes is refined”—the `received-routes` keyword shows the unfiltered inbound advertisement, while `routes` shows only what passes policy and is stored locally.

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 received-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 10.1.1.2 0 100 0 65001 i *> 192.168.1.0/24 10.1.1.2 0 100 0 65001 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, both from AS 65001.
The output shows two prefixes with path AS 65001, received from the neighbor.
B
R1 is sending two routes to neighbor 10.1.1.2.
Why wrong: This command shows received routes, not advertised.
C
R1 is receiving two routes, but one is filtered out by inbound policy.
Why wrong: Both routes are shown as valid and best; no filtering is indicated.
D
R1 is receiving two routes, but the neighbor is not reachable.
Why wrong: The output shows routes received, so the neighbor is reachable.

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 receiving two routes from neighbor 10.1.1.2, both from AS 65001.

The show bgp neighbors received-routes command displays routes received from the neighbor 10.1.1.2. Both routes have next hop 10.1.1.2 and originate from AS 65001. The 'valid' and 'best' status indicates they are installed in the routing table.

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, both from AS 65001.
Why this is correct
The output shows two prefixes with path AS 65001, received from the neighbor.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
✗
R1 is sending two routes to neighbor 10.1.1.2.
Why it's wrong here
This command shows received routes, not advertised.
✗
R1 is receiving two routes, but one is filtered out by inbound policy.
Why it's wrong here
Both routes are shown as valid and best; no filtering is indicated.
✗
R1 is receiving two routes, but the neighbor is not reachable.
Why it's wrong here
The output shows routes received, so the neighbor is reachable.

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 received routes, not advertised.

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 receiving two routes from neighbor 10.1.1.2, both from AS 65001. — The show bgp neighbors received-routes command displays routes received from the neighbor 10.1.1.2. Both routes have next hop 10.1.1.2 and originate from AS 65001. The 'valid' and 'best' status indicates they are installed in the routing table.

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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