Question 170 of 2,015

BGP →hardMultiple SelectObjective-mapped

350-401 BGP Practice Question

Q: How is BGP tested on the 350-401 exam?

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

Q: What is the correct answer to this BGP 350-401 question?

The correct answer is: A route with a lower MED is preferred over a route with a higher MED when all other factors are equal. — The BGP best-path selection algorithm considers the highest weight first, then highest LOCAL_PREF, then locally originated routes (network or aggregate), then shortest AS_PATH, then lowest ORIGIN code (IGP < EGP < incomplete), then lowest MED, and so on. Routes with a lower MED are preferred. The highest LOCAL_PREF is preferred. The shortest AS_PATH is preferred. The lowest ORIGIN code is preferred. The lowest weight is not preferred; weight is Cisco-specific and higher weight is preferred.

Q: Why do candidates get BGP questions wrong on the 350-401 exam?

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 350-401 NAT questions on configuration and troubleshooting.

This 350-401 practice question tests your understanding of bgp. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.

Which three statements about BGP route selection are true? (Choose three.)

Question 1hardmulti select

Open the full BGP breakdown →

A
A route with a lower MED is preferred over a route with a higher MED when all other factors are equal.
Correct: MED is used to influence inbound traffic; a lower MED is preferred.
B
A route with a higher LOCAL_PREF is preferred over a route with a lower LOCAL_PREF.
Correct: LOCAL_PREF is used to influence outbound traffic; a higher LOCAL_PREF is preferred.
C
A route with a shorter AS_PATH is preferred over a route with a longer AS_PATH.
Correct: The shortest AS_PATH is preferred in BGP path selection.
D
A route with a lower weight is preferred over a route with a higher weight.
Why wrong: Incorrect: Weight is Cisco-specific; a higher weight is preferred, not lower.
E
A route with ORIGIN code EGP is preferred over a route with ORIGIN code IGP.
Why wrong: Incorrect: The preferred order is IGP (lowest), then EGP, then incomplete. So IGP is preferred over EGP.

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

✓

A route with a lower MED is preferred over a route with a higher MED when all other factors are equal.

The BGP best-path selection algorithm considers the highest weight first, then highest LOCAL_PREF, then locally originated routes (network or aggregate), then shortest AS_PATH, then lowest ORIGIN code (IGP < EGP < incomplete), then lowest MED, and so on. Routes with a lower MED are preferred. The highest LOCAL_PREF is preferred. The shortest AS_PATH is preferred. The lowest ORIGIN code is preferred. The lowest weight is not preferred; weight is Cisco-specific and higher weight is preferred.

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.

✓
A route with a lower MED is preferred over a route with a higher MED when all other factors are equal.
Why this is correct
Correct: MED is used to influence inbound traffic; a lower MED is preferred.
Related concept
Static NAT maps one inside address to one outside address.
✓
A route with a higher LOCAL_PREF is preferred over a route with a lower LOCAL_PREF.
Why this is correct
Correct: LOCAL_PREF is used to influence outbound traffic; a higher LOCAL_PREF is preferred.
Related concept
Static NAT maps one inside address to one outside address.
✓
A route with a shorter AS_PATH is preferred over a route with a longer AS_PATH.
Why this is correct
Correct: The shortest AS_PATH is preferred in BGP path selection.
Related concept
Static NAT maps one inside address to one outside address.
✗
A route with a lower weight is preferred over a route with a higher weight.
Why it's wrong here
Incorrect: Weight is Cisco-specific; a higher weight is preferred, not lower.
✗
A route with ORIGIN code EGP is preferred over a route with ORIGIN code IGP.
Why it's wrong here
Incorrect: The preferred order is IGP (lowest), then EGP, then incomplete. So IGP is preferred over EGP.

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 350-401 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this 350-401 question test?

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

What is the correct answer to this question?

The correct answer is: A route with a lower MED is preferred over a route with a higher MED when all other factors are equal. — The BGP best-path selection algorithm considers the highest weight first, then highest LOCAL_PREF, then locally originated routes (network or aggregate), then shortest AS_PATH, then lowest ORIGIN code (IGP < EGP < incomplete), then lowest MED, and so on. Routes with a lower MED are preferred. The highest LOCAL_PREF is preferred. The shortest AS_PATH is preferred. The lowest ORIGIN code is preferred. The lowest weight is not preferred; weight is Cisco-specific and higher weight is preferred.

What should I do if I get this 350-401 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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