20 AWS Networking Interview Questions and Answers

As a leading provider of cloud computing services, Amazon Web Services (AWS) offers a variety of networking products and services. If you are interviewing for a position that involves working with AWS networking products and services, you can expect to be asked questions about your knowledge and experience.

Preparing for these questions ahead of time can help you feel more confident and give you the best chance of impressing the interviewer. In this article, we review some of the most common AWS networking interview questions.

AWS Networking Interview Questions and Answers

Here are 20 commonly asked AWS Networking interview questions and answers to prepare you for your interview:

1. What is AWS?

Amazon Web Services (AWS) is a cloud computing platform that offers a variety of services, including storage, computing, and networking. AWS is a pay-as-you-go service, which means that you only pay for the services that you use.

2. Can you explain what an Elastic IP address in the context of Amazon Web Services is?

An Elastic IP address is a public IP address that can be assigned to an Amazon Web Services account. This IP address can then be used to access AWS resources, such as EC2 instances.

3. How can you share files between instances with AWS?

You can share files between instances in AWS using either the Amazon Elastic File System (EFS) or the Amazon Simple Storage Service (S3). EFS is a managed file system that can be used to store and share files across multiple instances. S3 is an object storage service that can be used to store and share files across multiple instances.

4. Is it possible to run a script on boot up for an EC2 instance? If yes, how would you go about doing that?

Yes, it is possible to run a script on boot up for an EC2 instance. You would need to use the User Data feature in order to do this. User Data allows you to specify a script that will be automatically run when the instance is launched. This script can be used to perform any necessary setup or configuration tasks that you need to be done on boot up.

5. Which part of your VPC network do you want to expose to the Internet?

The part of your VPC network that you want to expose to the Internet is called the public subnet. The public subnet is the portion of your network that is reachable by the Internet. Any resources that you want to be accessible to the outside world, such as a web server, must be placed in the public subnet.

6. Can you explain what a subnet is?

A subnet is a portion of a network that is isolated from the rest of the network. Subnets are typically used to segment a network into smaller, more manageable pieces.

7. What are some common methods used to increase security in cloud environments?

There are a few common methods used to increase security in cloud environments:

1. Use a VPN: A VPN can help to encrypt data and keep it safe from being intercepted by third parties.
2. Use firewalls: Firewalls can help to block unwanted traffic and keep your data safe.
3. Use security groups: Security groups can help to control access to your resources and limit the ability of malicious users to access your data.
4. Use IAM roles: IAM roles can help to control who has access to your AWS resources and what they can do with them.
5. Use CloudTrail: CloudTrail can help you to track activity in your AWS account and identify potential security issues.

8. What’s the difference between an elastic load balancer and an autoscaling group?

An elastic load balancer is a software-based load balancer that automatically distributes incoming traffic across multiple Amazon EC2 instances. An autoscaling group is a collection of Amazon EC2 instances that are automatically scaled up or down based on conditions that you define.

9. How does one configure NAT (Network Address Translation) on AWS?

NAT is a method of remapping one IP address space into another by modifying network address information in the IP header of packets while they are in transit across a traffic routing device. The device is typically a firewall or router.

To configure NAT on AWS, you will need to create a NAT instance. This can be done using the AWS Management Console or the AWS Command Line Interface (CLI). Once the instance is created, you will need to configure your security groups and route tables to allow traffic to flow to and from the instance.

10. Is it possible to create multiple VPCs in different regions?

Yes, it is possible to create multiple VPCs in different regions. This can be useful if you want to create a more complex network setup, or if you want to isolate different parts of your network for security purposes.

11. How many internet gateways can be attached to a single VPC at any given time?

You can only attach one internet gateway to a VPC at a time.

12. What is the maximum number of routes allowed per route table in AWS?

The maximum number of routes allowed per route table in AWS is 100.

13. What happens if I don’t associate a subnet to a specific availability zone when creating it?

If you don’t associate a subnet to a specific availability zone when creating it, then AWS will automatically select one for you.

14. What is AWS Public IPv4 addressing?

AWS Public IPv4 addressing is a way for AWS customers to access their resources using a public IP address. This address can be used to connect to the Internet, and it can also be used to connect to other AWS resources.

15. Can you explain what Amazon Route 53 is and why we need it?

Amazon Route 53 is a DNS (Domain Name System) service that provides a scalable and reliable way to route end users to Internet applications. Route 53 uses a global network of DNS servers to route end users to the closest server to them, which reduces latency and improves performance. Additionally, Route 53 can be used to route end users to different versions of an application, or to different applications altogether, based on factors such as the user’s location or the time of day. This allows for a more flexible and reliable application delivery infrastructure.

16. What is the purpose of DNS servers in AWS?

DNS servers are used to resolve domain names to IP addresses. This allows users to connect to AWS resources using easy-to-remember domain names instead of IP addresses.

17. How does AWS CloudFront work?

CloudFront is a content delivery network (CDN) that speeds up the delivery of your static and dynamic web content, such as .html, .css, .js, and image files, to your users. It does this by caching the content at edge locations around the world and then serving it to users from the location that is closest to them.

18. Can you explain what multi-factor authentication is? Why should we use it?

Multi-factor authentication is an authentication method that requires the use of more than one factor to verify the identity of a user. The most common factors are something the user knows (like a password), something the user has (like a security token), and something the user is (like a fingerprint). Using multi-factor authentication is more secure than using a single factor, because it is more difficult for an attacker to compromise all of the factors.

19. Explain the concept of Availability zones.

Availability zones are data centers that are physically separate from each other, but are connected through a high-speed network. This allows for increased availability of resources, as well as increased redundancy in the event of a failure in one Availability Zone.

20. What is AWS Direct Connect?

AWS Direct Connect is a way to connect your on-premises network directly to your AWS VPC (virtual private cloud). This can provide a more reliable and higher-bandwidth connection than a standard internet connection.