- A
Set the Local Preference attribute on routes received from AWS.
Why wrong: Local Preference is used within an AS, not sent to peers.
- B
Prepend AS_PATH on routes advertised to AWS.
AS_PATH prepend makes a path less preferred for outbound traffic from AWS.
- C
Set the MED attribute on routes advertised to AWS.
Why wrong: MED influences inbound traffic from on-premises to AWS.
- D
Apply a BGP community tag to routes received from AWS.
Why wrong: Community tags can be used for route filtering but not directly for outbound traffic influence.
Question 1,116 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 needs to connect its on-premises data center to AWS using AWS Direct Connect. The company has two redundant connections and wants to use BGP as the routing protocol. Which BGP attribute should be manipulated to influence outbound traffic from AWS to the on-premises network?
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
✓
Prepend AS_PATH on routes advertised to AWS.
To influence outbound traffic from AWS to the on-premises network, you must make the on-premises routes less attractive to AWS. Prepend AS_PATH on routes advertised to AWS increases the AS path length, making those routes less preferred by AWS's BGP best-path selection, thus steering traffic away from that Direct Connect virtual interface.
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.
- ✗
Set the Local Preference attribute on routes received from AWS.
Why it's wrong here
Local Preference is used within an AS, not sent to peers.
- ✓
Prepend AS_PATH on routes advertised to AWS.
Why this is correct
AS_PATH prepend makes a path less preferred for outbound traffic from AWS.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set the MED attribute on routes advertised to AWS.
Why it's wrong here
MED influences inbound traffic from on-premises to AWS.
- ✗
Apply a BGP community tag to routes received from AWS.
Why it's wrong here
Community tags can be used for route filtering but not directly for outbound traffic influence.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing inbound vs. outbound traffic manipulation: candidates often pick Local Preference (Option A) because it is a common attribute for influencing path selection, but it only affects traffic entering the local AS, not traffic leaving AWS.
Detailed technical explanation
How to think about this question
BGP best-path selection prefers the shortest AS_PATH; by prepending your own AS number multiple times, you artificially lengthen the path, making that route less preferred compared to a shorter path via a redundant connection. This technique is commonly used in AWS Direct Connect scenarios with multiple VIFs to control traffic flow without complex policy-based routing, and it works because AWS respects the AS_PATH attribute in its BGP decision process.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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: Prepend AS_PATH on routes advertised to AWS. — To influence outbound traffic from AWS to the on-premises network, you must make the on-premises routes less attractive to AWS. Prepend AS_PATH on routes advertised to AWS increases the AS path length, making those routes less preferred by AWS's BGP best-path selection, thus steering traffic away from that Direct Connect virtual interface.
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.
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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