- A
A route in the on-premises router for the VPC CIDR (10.0.0.0/16) pointing to the AWS Direct Connect router.
Why wrong: This is needed but the question asks for configurations in AWS side, not on-premises.
- B
A route in the VPC route table for 0.0.0.0/0 pointing to the internet gateway.
Required for VPC internet access.
- C
A route in the VPC route table for 0.0.0.0/0 pointing to the virtual private gateway.
Why wrong: That would route internet traffic through Direct Connect, not desired.
- D
A route in the VPC route table for the on-premises CIDR (192.168.0.0/16) pointing to the internet gateway.
Why wrong: Wrong, should point to VGW.
- E
A route in the VPC route table for the on-premises CIDR (192.168.0.0/16) pointing to the virtual private gateway.
Required to route traffic from VPC to on-premises.
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 is using AWS Direct Connect with a private VIF to connect its on-premises network to a VPC. The VPC has a CIDR 10.0.0.0/16. The on-premises network uses 192.168.0.0/16. The company wants to enable communication between on-premises and the VPC, and also allow the VPC to access the internet via an internet gateway. Which TWO of the following configurations are necessary?
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 in the VPC route table for 0.0.0.0/0 pointing to the internet gateway.
Option A is correct because the VPC route table must have a route for 192.168.0.0/16 pointing to the virtual private gateway (VGW) to route traffic to on-premises. Option D is correct because the VPC route table must have a route for 0.0.0.0/0 pointing to the internet gateway for outbound internet access. Option B is not necessary because the VGW is automatically attached. Option C is not necessary because the on-premises router must have routes to the VPC CIDR, not the internet gateway. Option E is not necessary because the VGW already handles routing.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 in the on-premises router for the VPC CIDR (10.0.0.0/16) pointing to the AWS Direct Connect router.
Why it's wrong here
This is needed but the question asks for configurations in AWS side, not on-premises.
- ✓
A route in the VPC route table for 0.0.0.0/0 pointing to the internet gateway.
Why this is correct
Required for VPC internet access.
Related concept
CIDR notation defines the prefix length.
- ✗
A route in the VPC route table for 0.0.0.0/0 pointing to the virtual private gateway.
Why it's wrong here
That would route internet traffic through Direct Connect, not desired.
- ✗
A route in the VPC route table for the on-premises CIDR (192.168.0.0/16) pointing to the internet gateway.
Why it's wrong here
Wrong, should point to VGW.
- ✓
A route in the VPC route table for the on-premises CIDR (192.168.0.0/16) pointing to the virtual private gateway.
Why this is correct
Required to route traffic from VPC to on-premises.
Related concept
CIDR notation defines the prefix length.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: A route in the VPC route table for 0.0.0.0/0 pointing to the internet gateway. — Option A is correct because the VPC route table must have a route for 192.168.0.0/16 pointing to the virtual private gateway (VGW) to route traffic to on-premises. Option D is correct because the VPC route table must have a route for 0.0.0.0/0 pointing to the internet gateway for outbound internet access. Option B is not necessary because the VGW is automatically attached. Option C is not necessary because the on-premises router must have routes to the VPC CIDR, not the internet gateway. Option E is not necessary because the VGW already handles routing.
What should I do if I get this ANS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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