Question 942 of 2,152

Administrative Distance →hardMultiple ChoiceObjective-mapped

300-410 Administrative Distance Practice Question

This 300-410 practice question tests your understanding of administrative distance. 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 is troubleshooting a multi-homed BGP setup. R1 receives the prefix 10.1.1.0/24 from two eBGP peers: R2 (AS 100) and R3 (AS 200). The engineer configures the distance bgp 20 20 20 command on R1 to make all BGP routes have the same AD. However, R1 still prefers the route from R2 over R3. What is the most likely reason?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1hardmultiple choice

Open the full BGP breakdown →

A
The route from R2 has a lower MED than the route from R3.
Why wrong: MED is compared after local preference and AS path; if all are equal, MED could be a factor, but the question implies a more fundamental attribute is different.
B
The route from R2 has a higher local preference than the route from R3.
Local preference is compared before AS path and MED; if R2's route has a higher local preference (e.g., 150 vs 100), it will be preferred even with equal AD.
C
The route from R2 is the oldest BGP route.
Why wrong: The oldest route is a tie-breaker only if all other attributes are equal; local preference is compared first.
D
The AS path for the route from R2 is shorter than that from R3.
Why wrong: AS path length is compared after local preference; if local preference differs, AS path is not considered.

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 route from R2 has a higher local preference than the route from R3.

The distance bgp command sets AD for eBGP, iBGP, and local routes. With AD equal, the router uses other BGP path attributes, such as local preference, AS path length, or MED. The most common tie-breaker is local preference (default 100) or the oldest route.

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.

✗
The route from R2 has a lower MED than the route from R3.
Why it's wrong here
MED is compared after local preference and AS path; if all are equal, MED could be a factor, but the question implies a more fundamental attribute is different.
✓
The route from R2 has a higher local preference than the route from R3.
Why this is correct
Local preference is compared before AS path and MED; if R2's route has a higher local preference (e.g., 150 vs 100), it will be preferred even with equal AD.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The route from R2 is the oldest BGP route.
Why it's wrong here
The oldest route is a tie-breaker only if all other attributes are equal; local preference is compared first.
✗
The AS path for the route from R2 is shorter than that from R3.
Why it's wrong here
AS path length is compared after local preference; if local preference differs, AS path is not considered.

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.

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?

Administrative Distance — This question tests Administrative Distance — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: The route from R2 has a higher local preference than the route from R3. — The distance bgp command sets AD for eBGP, iBGP, and local routes. With AD equal, the router uses other BGP path attributes, such as local preference, AS path length, or MED. The most common tie-breaker is local preference (default 100) or the oldest route.

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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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