- A
Destination: 0.0.0.0/0, Target: igw-xxxxxxxx
Why wrong: Incorrect. A default route to an internet gateway would send all internet-bound traffic to the internet, but the on-premises traffic is not internet-bound and must go through the virtual private gateway.
- B
Destination: 0.0.0.0/0, Target: nat-xxxxxxxx
Why wrong: Incorrect. A default route to a NAT gateway is used for private subnets to access the internet, but it is not required for traffic to on-premises over Direct Connect. The question does not mention any need for internet access.
- C
Destination: 10.0.0.0/16, Target: local
Correct. The local route for the VPC CIDR is automatically added and allows the instance to communicate within the VPC. This is necessary as the instance sends traffic to the on-premises server, and the route table must have a local entry for the VPC.
- D
Destination: 192.168.1.0/24, Target: vgw-xxxxxxxx
Correct. A specific route for the on-premises network (192.168.1.0/24) pointing to the virtual private gateway ensures that traffic destined for the on-premises server is routed over the Direct Connect private VIF.
- E
Destination: 10.0.1.0/29, Target: local
Why wrong: Incorrect CIDR; the local route covers the whole VPC.
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 of 10.0.0.0/16. It creates a subnet 10.0.1.0/24 in us-east-1a and launches an EC2 instance with a private IP 10.0.1.10. The instance needs to send traffic to an on-premises server at 192.168.1.50 over a Direct Connect private VIF. The VPC has a virtual private gateway attached and a route table associated with the subnet. Which THREE entries must exist in the route table for the traffic to succeed?
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
Destination: 10.0.0.0/16, Target: local
For traffic from an EC2 instance in a VPC to an on-premises server over a Direct Connect private VIF, the route table must include two entries: a local route for the VPC CIDR (10.0.0.0/16) which is automatically added and enables communication within the VPC (Option C), and a specific route to the on-premises network (192.168.1.0/24) pointing to the virtual private gateway (vgw-xxxxxxxx) so that traffic destined for 192.168.1.50 is directed over the Direct Connect (Option D). A default route (0.0.0.0/0) to a NAT gateway is not required because the question only specifies traffic to the on-premises server, not internet access. Therefore, only options C and D are necessary.
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.
- ✗
Destination: 0.0.0.0/0, Target: igw-xxxxxxxx
Why it's wrong here
Incorrect. A default route to an internet gateway would send all internet-bound traffic to the internet, but the on-premises traffic is not internet-bound and must go through the virtual private gateway.
- ✗
Destination: 0.0.0.0/0, Target: nat-xxxxxxxx
Why it's wrong here
Incorrect. A default route to a NAT gateway is used for private subnets to access the internet, but it is not required for traffic to on-premises over Direct Connect. The question does not mention any need for internet access.
- ✓
Destination: 10.0.0.0/16, Target: local
Why this is correct
Correct. The local route for the VPC CIDR is automatically added and allows the instance to communicate within the VPC. This is necessary as the instance sends traffic to the on-premises server, and the route table must have a local entry for the VPC.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Destination: 192.168.1.0/24, Target: vgw-xxxxxxxx
Why this is correct
Correct. A specific route for the on-premises network (192.168.1.0/24) pointing to the virtual private gateway ensures that traffic destined for the on-premises server is routed over the Direct Connect private VIF.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Destination: 10.0.1.0/29, Target: local
Why it's wrong here
Incorrect CIDR; the local route covers the whole VPC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates might think a default route to a NAT gateway is required for any outbound traffic, but the question specifically asks only about traffic to the on-premises server. The correct required routes are only the local route and the specific route to the on-premises network.
Detailed technical explanation
How to think about this question
In AWS, route tables use the most specific route that matches the destination IP (longest prefix match). The local route (10.0.0.0/16) is automatically added and cannot be deleted; it ensures traffic within the VPC stays within the VPC. For traffic to on-premises, a static route (e.g., 192.168.1.0/24) must point to the virtual private gateway, which propagates routes via BGP over the Direct Connect private VIF. The NAT gateway route (0.0.0.0/0) is typically used for private subnets to access the internet, but it is not strictly required for on-premises traffic; however, in this scenario, the instance may need internet access for updates or other services, making it a common inclusion.
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.
Visual reference
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Destination: 10.0.0.0/16, Target: local — For traffic from an EC2 instance in a VPC to an on-premises server over a Direct Connect private VIF, the route table must include two entries: a local route for the VPC CIDR (10.0.0.0/16) which is automatically added and enables communication within the VPC (Option C), and a specific route to the on-premises network (192.168.1.0/24) pointing to the virtual private gateway (vgw-xxxxxxxx) so that traffic destined for 192.168.1.50 is directed over the Direct Connect (Option D). A default route (0.0.0.0/0) to a NAT gateway is not required because the question only specifies traffic to the on-premises server, not internet access. Therefore, only options C and D are necessary.
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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