- A
Traffic to 10.0.0.5 is sent to the internet gateway.
Why wrong: No route to IGW for 10.0.0.5.
- B
Traffic to 10.0.0.5 is routed through the VPN gateway.
Why wrong: The local route is more specific.
- C
Traffic to 10.0.0.5 stays within the VPC.
The VPC's local route matches 10.0.0.5.
- D
Traffic to 10.0.0.5 is dropped because there is no matching route.
Why wrong: There is a local route.
Question 1,384 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 has a VPC with a CIDR block of 10.0.0.0/16. The VPC has three subnets: 10.0.1.0/24, 10.0.2.0/24, and 10.0.3.0/24. An EC2 instance in subnet 10.0.1.0/24 needs to send traffic to an on-premises server at 10.0.0.5/32 via a VPN connection. The VPC route table has a route to the VPN gateway for 10.0.0.0/8. What is the expected behavior?
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
✓
Traffic to 10.0.0.5 stays within the VPC.
The VPC's CIDR is 10.0.0.0/16, and the destination 10.0.0.5/32 falls within this range. AWS VPCs use the most specific route that matches the destination IP, and the local route (10.0.0.0/16) is automatically added to all VPC route tables. Since 10.0.0.5/32 is a subset of 10.0.0.0/16, the local route takes precedence over the VPN route (10.0.0.0/8) because it is more specific (longer prefix length). Therefore, traffic destined to 10.0.0.5 stays within the VPC and is not sent to the VPN gateway.
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.
- ✗
Traffic to 10.0.0.5 is sent to the internet gateway.
Why it's wrong here
No route to IGW for 10.0.0.5.
- ✗
Traffic to 10.0.0.5 is routed through the VPN gateway.
Why it's wrong here
The local route is more specific.
- ✓
Traffic to 10.0.0.5 stays within the VPC.
Why this is correct
The VPC's local route matches 10.0.0.5.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Traffic to 10.0.0.5 is dropped because there is no matching route.
Why it's wrong here
There is a local route.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that a route to a larger CIDR (like 10.0.0.0/8) will override a more specific local route (like 10.0.0.0/16), but AWS always uses the longest prefix match, so the local route takes precedence.
Detailed technical explanation
How to think about this question
AWS VPC route tables use longest prefix match routing, meaning the route with the most specific (largest subnet mask) destination is selected. The local route is automatically added for the VPC's CIDR and cannot be deleted or overridden by less specific routes. In this scenario, the VPN route (10.0.0.0/8) is less specific than the local route (10.0.0.0/16), so traffic to 10.0.0.5 is always routed locally. This behavior is consistent with RFC 4632 and ensures that VPC-internal traffic never leaves the VPC unless explicitly directed by a more specific route.
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.
Visual reference
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: Traffic to 10.0.0.5 stays within the VPC. — The VPC's CIDR is 10.0.0.0/16, and the destination 10.0.0.5/32 falls within this range. AWS VPCs use the most specific route that matches the destination IP, and the local route (10.0.0.0/16) is automatically added to all VPC route tables. Since 10.0.0.5/32 is a subset of 10.0.0.0/16, the local route takes precedence over the VPN route (10.0.0.0/8) because it is more specific (longer prefix length). Therefore, traffic destined to 10.0.0.5 stays within the VPC and is not sent to the VPN gateway.
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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