SAP-C02 Continuous Improvement for Existing Solutions Practice Question
Network Topology
Refer to the exhibit. An EC2 instance in subnet-11111 (10.0.1.0/24) cannot access the internet. The route table for the subnet is shown. What is the MOST likely cause?
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
✓
The NAT gateway is not in a public subnet with an internet gateway.
For an EC2 instance in a private subnet to access the internet via a NAT gateway, the NAT gateway must be deployed in a public subnet (with a route to an internet gateway). Option D correctly identifies that the NAT gateway is not in a public subnet with an internet gateway. Option A is incorrect because the route table does have a default route (0.0.0.0/0) pointing to the NAT gateway. Option B is incorrect because the VPC has a local route for internal traffic. Option C is incorrect because the route table is associated with the subnet (the exhibit shows the subnet ID). Therefore, the most likely cause is that the NAT gateway itself is in a private subnet, preventing it from reaching the internet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The route table does not have a default route (0.0.0.0/0).
Why it's wrong here
The route table shows a 0.0.0.0/0 route.
- ✗
The VPC does not have a local route.
Why it's wrong here
The local route is present.
- ✗
The route table is not associated with the subnet.
Why it's wrong here
The association shows the route table is associated with subnet-11111.
- ✓
The NAT gateway is not in a public subnet with an internet gateway.
Why this is correct
NAT gateway requires a public subnet and internet gateway to function.
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Written by Johnson Ajibi, MSc IT Security
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