The answer is that the prefix is learned via eBGP and is the best path, as confirmed by the "best" and "external" flags in the output. This is correct because the show bgp ipv4 unicast command reveals that the route for 192.168.10.0/24 is received from neighbor 10.1.1.2 with an origin of "Local" and is marked valid, external, and best, meaning it has passed all BGP path selection criteria and will be installed in the routing table. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to perform BGP prefix best path verification by interpreting the detailed route output, especially distinguishing between eBGP (external) and iBGP routes, and recognizing that the "best" flag indicates the winning path after comparing attributes like local preference and metric. A common trap is assuming that "valid" alone means the route is installed—remember that only the path marked "best" is actually used. Memory tip: think "BEST = BGP External Selected for Table" to recall that external, best, and valid together confirm the installed path.
300-410 Device Management Practice Question
This 300-410 practice question tests your understanding of device management. 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 prefix issue:
R1# show bgp ipv4 unicast 192.168.10.0/24
BGP routing table entry for 192.168.10.0/24, version 5
Paths: (1 available, best #1, table default)
Advertised to update-groups:
1
Refresh Epoch 1
Local
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The prefix is learned via eBGP and is the best path.
The output shows that the prefix 192.168.10.0/24 is learned via eBGP from neighbor 10.1.1.2 (router ID 2.2.2.2). It is marked as valid, external, and best, meaning it is 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.
✓
The prefix is learned via eBGP and is the best path.
Why this is correct
The output shows 'valid, external, best', confirming it is the best eBGP route.
Clue confirmation
The clue word "best" in the question point toward this answer.
The prefix is learned via iBGP and is not the best path.
Why it's wrong here
It is marked as external, not internal.
✗
The prefix is suppressed and not advertised to peers.
Why it's wrong here
It is advertised to update-group 1.
✗
The prefix is invalid due to missing next-hop reachability.
Why it's wrong here
The prefix is marked as valid.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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.
Device Management — This question tests Device Management — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The prefix is learned via eBGP and is the best path. — The output shows that the prefix 192.168.10.0/24 is learned via eBGP from neighbor 10.1.1.2 (router ID 2.2.2.2). It is marked as valid, external, and best, meaning it is installed in the routing table.
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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