Question 1,284 of 1,621
ANS-C01 Network Design Practice Question
A company has a VPC with public and private subnets. The private subnets need to access the internet for software updates. The company has an internet gateway attached to the VPC and a NAT gateway in a public subnet. Which route table configuration is required for the private subnets to access the internet?
⚠ Common exam trap
AWS often tests the misconception that private subnets can use the internet gateway directly via a default route, but the trap here is that private subnets must route through a NAT gateway or NAT instance to maintain their private nature and avoid direct inbound internet access.
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
✓
Add a route in the private subnet route table with destination 0.0.0.0/0 and target the NAT gateway.
Private subnets require a default route (0.0.0.0/0) pointing to the NAT gateway to enable outbound internet access while preventing inbound traffic from the internet. The NAT gateway, residing in a public subnet with an associated Elastic IP, translates private IP addresses to the Elastic IP for internet-bound traffic. The internet gateway is used by public subnets, not private subnets, for direct internet access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add a route in the private subnet route table with destination 0.0.0.0/0 and target the internet gateway.
Why it's wrong here
Direct internet gateway route would bypass NAT and private IPs would not work.
- ✓
Add a route in the private subnet route table with destination 0.0.0.0/0 and target the NAT gateway.
Why this is correct
This allows private instances to use NAT for internet access.
- ✗
Add a route in the public subnet route table with destination 0.0.0.0/0 and target the NAT gateway.
Why it's wrong here
Public subnet route table needs internet gateway, not NAT.
- ✗
Add a route in the private subnet route table with destination 0.0.0.0/0 and target the internet gateway, and associate an Elastic IP with the NAT gateway.
Why it's wrong here
Private subnets cannot route directly to internet gateway.
Visual reference
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Last reviewed: Jun 30, 2026
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