Question 130 of 1,621
ANS-C01 Network Implementation Practice Question
A company is deploying a multi-tier application on AWS and needs to ensure that traffic between the web tier and the application tier does not traverse the internet. Both tiers are deployed in the same VPC but in different subnets. What is the MOST secure way to meet this requirement?
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
✓
Use route tables and security groups to allow traffic within the VPC
The most secure way to ensure that traffic between the web tier and the application tier does not traverse the internet is to use route tables and security groups to allow traffic within the VPC. Both tiers are in the same VPC but in different subnets, so traffic stays within the VPC by default if routing is configured correctly. Route tables direct traffic between subnets, and security groups act as virtual firewalls to control inbound and outbound traffic. Option D is correct. Option A is wrong because an Internet Gateway is used for internet access, not for routing within a VPC. Option B is wrong because VPC Peering connects different VPCs, not subnets within the same VPC. Option C is wrong because a NAT Gateway is for outbound internet access from private subnets, not for inter-subnet communication.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use an Internet Gateway to route traffic between subnets
Why it's wrong here
Incorrect; Internet Gateways expose traffic to the internet, which is not private.
- ✗
Use VPC Peering between the subnets
Why it's wrong here
Incorrect; VPC Peering connects different VPCs, not subnets within the same VPC.
- ✗
Use a NAT Gateway in each subnet for inter-subnet communication
Why it's wrong here
Incorrect; NAT Gateways are for outbound traffic to the internet, not for private communication.
- ✓
Use route tables and security groups to allow traffic within the VPC
Why this is correct
Correct; local routes already enable communication within a VPC; security groups and NACLs provide security.
Visual reference
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Last reviewed: Jun 20, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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