Question 72 of 2,152

BGP Troubleshooting →mediumMultiple ChoiceObjective-mapped

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 ipv4 unicast 192.168.1.0/24

BGP routing table entry for 192.168.1.0/24, version 12 Paths: (2 available, best #2, table default) Advertised to update-groups: 1 Refresh Epoch 1 65001

10.1.1.2 from 10.1.1.2 (10.1.1.2)

Origin IGP, metric 0, localpref 100, valid, external, best Refresh Epoch 2 65002

10.2.2.2 from 10.2.2.2 (10.2.2.2)

Origin IGP, metric 0, localpref 50, valid, external

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
Both paths are equally preferred, and BGP load-balances traffic to 192.168.1.0/24.
Why wrong: Only the best path is used for forwarding; load-balancing requires multiple best paths, which is not shown.
B
The path from AS 65002 is preferred because it has a lower local preference.
Why wrong: Higher local preference is preferred. The path with localpref 100 is best.
C
The path from AS 65001 is the best path due to its higher local preference of 100.
Local preference is a weight attribute; higher values are preferred. The path with localpref 100 is selected as best.
D
The path from AS 65002 is the best path because it has a lower metric.
Why wrong: Both paths have metric 0. Local preference determines best path here.

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

✓

The path from AS 65001 is the best path due to its higher local preference of 100.

The show bgp ipv4 unicast command displays BGP paths for a specific prefix. Here, two paths are available: one from AS 65001 with local preference 100, and one from AS 65002 with local preference 50. The path with higher local preference (100) is selected as best.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Both paths are equally preferred, and BGP load-balances traffic to 192.168.1.0/24.
Why it's wrong here
Only the best path is used for forwarding; load-balancing requires multiple best paths, which is not shown.
✗
The path from AS 65002 is preferred because it has a lower local preference.
Why it's wrong here
Higher local preference is preferred. The path with localpref 100 is best.
✓
The path from AS 65001 is the best path due to its higher local preference of 100.
Why this is correct
Local preference is a weight attribute; higher values are preferred. The path with localpref 100 is selected as best.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The path from AS 65002 is the best path because it has a lower metric.
Why it's wrong here
Both paths have metric 0. Local preference determines best path here.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Trap categories for this question

Command / output trap
Only the best path is used for forwarding; load-balancing requires multiple best paths, which is not shown.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this 300-410 question test?

BGP Troubleshooting — This question tests BGP Troubleshooting — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: The path from AS 65001 is the best path due to its higher local preference of 100. — The show bgp ipv4 unicast command displays BGP paths for a specific prefix. Here, two paths are available: one from AS 65001 with local preference 100, and one from AS 65002 with local preference 50. The path with higher local preference (100) is selected as best.

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?

Static NAT maps one inside address to one outside address.

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Last reviewed: Jun 18, 2026

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