Top 10+ Interview Questions on AWS VPC

Here are some of the most common interview questions on AWS Virtual Private Cloud (VPC):

Fundamental Questions
What is an AWS VPC, and why is it important?
Explain the concept of a VPC as a logically isolated network in the AWS cloud.
Discuss its importance for security, scalability, and network isolation.
How do public and private subnets differ in a VPC?
Explain the role of public subnets for internet-facing resources.
Discuss the use of private subnets for internal-facing resources.
What are security groups and network access control lists (NACLs)?
Differentiate between security groups and NACLs.
Explain how they work together to control inbound and outbound traffic.
Advanced Questions
Explain the concept of Internet Gateway and NAT Gateway.
Describe the role of an Internet Gateway in enabling internet connectivity.
Discuss the use of a NAT Gateway to provide internet access to instances in private subnets.
How do you implement a highly available architecture using VPC?
Discuss the use of multiple Availability Zones.
Explain load balancing techniques to distribute traffic across multiple instances.
What is VPC peering, and how can it be used?
Define VPC peering and its purpose.
Explain how to establish VPC peering connections to create secure, private connections between VPCs.
How do you ensure security in an AWS VPC?
Discuss best practices for securing VPCs, including the use of security groups, NACLs, IAM roles, and encryption.
What are the different types of VPC endpoints?
Explain the difference between interface endpoints and gateway endpoints.
Discuss the use cases for each type of endpoint.
How can you optimize network performance within a VPC?
Discuss the use of placement groups to co-locate instances.
Explain the importance of network optimization techniques like EBS optimization and instance placement strategies.
What are the limitations of VPCs?
Discuss the limitations of VPC peering, such as the inability to route traffic directly between VPCs.
Explain the challenges of migrating existing on-premises networks to AWS VPCs.
Additional Tips for Interview Preparation:

Hands-on Experience: Practice creating and configuring VPCs in the AWS Management Console.
Understand AWS Best Practices: Familiarize yourself with AWS whitepapers and documentation.
Stay Updated: Keep up with the latest AWS announcements and features.
Practice Explaining Concepts Clearly: Be able to articulate complex concepts in a simple and understandable way.

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