- A
The prefix is learned via eBGP and is the best path.
The output shows 'valid, external, best', confirming it is the best eBGP route.
- B
The prefix is learned via iBGP and is not the best path.
Why wrong: It is marked as external, not internal.
- C
The prefix is suppressed and not advertised to peers.
Why wrong: It is advertised to update-group 1.
- D
The prefix is invalid due to missing next-hop reachability.
Why wrong: The prefix is marked as valid.
Question 93 of 2,152
BGP Prefix Best Path Verification
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
10.1.1.2 from 10.1.1.2 (2.2.2.2)
Origin IGP, metric 0, localpref 100, valid, external, best rx pathid: 0, tx pathid: 0x0
What does this output indicate?
Quick Answer
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.
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 prefix is learned via eBGP and is the best path.
The output shows the prefix 192.168.10.0/24 is learned from neighbor 10.1.1.2 with the path type 'external', indicating eBGP. The line 'valid, external, best' confirms it is the best path, making option A correct.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised 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: answer the scenario, not the keyword
Cisco often tests the distinction between eBGP and iBGP by using the 'external' or 'internal' keyword in the show output, and the trap here is that candidates may misread 'external' as 'iBGP' or overlook the 'best' flag, assuming the prefix is not the best path.
Detailed technical explanation
How to think about this question
In BGP, the 'best' path is selected based on a multi-step algorithm (e.g., highest weight, highest local preference, shortest AS path). The 'external' keyword indicates the route was learned from an eBGP peer, which by default has a lower administrative distance than iBGP routes. The 'rx pathid: 0, tx pathid: 0x0' fields are used for BGP add-path and path-ID tracking, not for best-path selection.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Management — This question tests Device Management — Read the scenario before looking for a memorised answer..
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 the prefix 192.168.10.0/24 is learned from neighbor 10.1.1.2 with the path type 'external', indicating eBGP. The line 'valid, external, best' confirms it is the best path, making option A correct.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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.
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