- A
Use AS_PATH prepending on the VIFs to make one path more preferred
Why wrong: AS_PATH prepending makes a path less preferred, not more.
- B
Enable Jumbo Frames on the Direct Connect connection
Why wrong: Jumbo Frames are for MTU, not routing preferences.
- C
Set the Local Preference attribute on the AWS side
Why wrong: Local Preference is a BGP attribute set on the receiving router, not on the AWS side.
- D
Configure BGP communities on the VIFs to influence route preference
BGP communities allow tagging routes to influence the on-premises router's preference.
Question 1,593 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company has a Direct Connect connection with multiple Virtual Interfaces (VIFs) to an on-premises network. The VIFs are associated with a Direct Connect Gateway that is attached to multiple VPCs. The company is experiencing asymmetric routing and wants to ensure that traffic from on-premises to the VPCs always uses the same VIF. Which configuration should be implemented?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"always"Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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
✓
Configure BGP communities on the VIFs to influence route preference
Option D is correct because BGP communities allow you to tag routes on the Direct Connect VIFs with specific community values (e.g., 7224:7100 for the primary VIF, 7224:7200 for the secondary VIF). AWS Direct Connect uses these community tags to influence route preference, ensuring that traffic from on-premises to the VPCs consistently uses the designated primary VIF. This mechanism provides granular control over path selection without modifying AS_PATH or local preference, directly addressing asymmetric routing.
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.
- ✗
Use AS_PATH prepending on the VIFs to make one path more preferred
Why it's wrong here
AS_PATH prepending makes a path less preferred, not more.
- ✗
Enable Jumbo Frames on the Direct Connect connection
Why it's wrong here
Jumbo Frames are for MTU, not routing preferences.
- ✗
Set the Local Preference attribute on the AWS side
Why it's wrong here
Local Preference is a BGP attribute set on the receiving router, not on the AWS side.
- ✓
Configure BGP communities on the VIFs to influence route preference
Why this is correct
BGP communities allow tagging routes to influence the on-premises router's preference.
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse AS_PATH prepending (which affects outbound traffic from AWS) with BGP communities (which can influence inbound traffic from on-premises), leading them to select Option A despite it solving the wrong direction of traffic flow.
Detailed technical explanation
How to think about this question
BGP communities in AWS Direct Connect work by tagging routes with specific values (e.g., 7224:7100 for primary, 7224:7200 for secondary) that AWS propagates to on-premises routers. The on-premises router must be configured to match these communities and adjust route preference (e.g., via route maps or local preference) to prefer the primary VIF. This is a common design pattern for active/standby or active/active with traffic engineering, and it requires coordination between AWS and the on-premises BGP configuration.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Quick reference
Asymmetric Encryption Algorithm Comparison
| Algorithm | Key Exchange | Signatures | Equivalent Security Key | Notes |
|---|---|---|---|---|
| RSA-3072 | Yes | Yes | 128-bit | Widely deployed; slow for bulk data |
| ECDSA P-256 | No | Yes | 128-bit | Fast signatures; standard TLS certs |
| ECDH / ECDHE | Yes | No | 128-bit | Perfect forward secrecy in TLS 1.3 |
| DH / DHE | Yes | No | 128-bit (3072-bit key) | Replaced by ECDHE in modern TLS |
| Ed25519 | No | Yes | ~128-bit | SSH keys, modern PKI |
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure BGP communities on the VIFs to influence route preference — Option D is correct because BGP communities allow you to tag routes on the Direct Connect VIFs with specific community values (e.g., 7224:7100 for the primary VIF, 7224:7200 for the secondary VIF). AWS Direct Connect uses these community tags to influence route preference, ensuring that traffic from on-premises to the VPCs consistently uses the designated primary VIF. This mechanism provides granular control over path selection without modifying AS_PATH or local preference, directly addressing asymmetric routing.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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
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