April 25, 2022

Top 20 AWS VPC Interview Questions and Answers


VPC (Virtual Private Cloud) is one of the AWS services that is gaining traction in the tech employment market these days. Knowing the fundamentals of VPC might provide job seekers who want to work for Amazon Web Services an advantage. It is our responsibility to prepare you for this. As a result, we've compiled a list of the finest AWS VPC interview questions that frequently appear in AWS interviews. Before we get into that, let's go over some of the fundamentals of this technology that a newbie should be aware of while taking AWS training.

As most of you are aware, Amazon Web Services (AWS) is an Amazon subsidiary that offers cloud computing services based on user demand. Users must pay a monthly subscription fee. Amazon offers a variety of services that allow you to effortlessly integrate your local resources with the cloud. AWS S3 (Simple Storage Service) is an Amazon Web Services (AWS) service that offers object storage using several web service interfaces such as SOAP, BitTorrent, and others. Knowing how to respond to common AWS interview questions can give you an advantage over other candidates vying for a spot on the AWS team.

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Ques. 1): Is there a limit to how many VPCs, VPNs, Subnets, and Gateways I can create?


Those things are unquestionably constrained in their production. In a single region, you can only construct five VPCs. If you want to increase the limit, you'll need to increase the internet gateway as well.

VPNs, elastic IP addresses, NAT gateways, and internet gateways all have a maximum limit of five. The maximum number of subnets per VPC is 200.

Furthermore, there is a maximum of 50 customer portals per area.

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Ques. 2): What Is It That Sets AWS VPC Apart From Other Private Clouds?


The following two qualities distinguish AWS VPC from other cloud computing services:

When you need a private network in the cloud, it eliminates the need to set up and manage physical data centres, hardware, and/or virtual private networks.

AWS VPC is extremely secure against security and privacy threats because to its comprehensive security measures.

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Ques. 3): What exactly is the meaning of the phrase "VPC"?


VPC stands for Virtual Private Cloud, and it's a private network space within the Amazon cloud where you can deploy AWS resources. It's Amazon EC2's actual networking layer, which we've already talked about. Each virtual network in the cloud that you construct will be logically separated from other virtual networks in the cloud.

Although the layout of a VPC is similar to that of a typical network in a data centre, a VPC will benefit from AWS's scalable architecture. Another significant benefit of VPC is that it is completely customizable. You can create subnets, set up root tables, configure network gateways, setup network access control lists, choose IP address range, and many more in a Virtual Private Cloud.

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Ques. 4): What is a Network Address Translation (NAT) Device?


In your VPC, a NAT device will allow instances in the private subnet to send outward IPv4 traffic to other AWS services/the internet while preventing inbound traffic from the internet. When traffic is sent to the internet, the IP address is replaced by the address of the NAT device, and when the response is returned to the instances, the device translates the instances' addresses back to private IP addresses. There are two types of NAT devices available on AWS: NAT instance and NAT gateway. NAT instances are configured on Linux AMIs. IPv6 is not supported by NAT.

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Ques. 5): What Are My Vpc's Connectivity Options?


You can link your VPC to the following resources:

  • The World Wide Web (via an Internet gateway)
  • Using a Hardware VPN connection to access to your business data centre (via the virtual private gateway)
  • The Internet as well as your company's data centre (utilizing both an Internet gateway and a virtual private gateway)
  • AWS's other services (via Internet gateway, NAT, virtual private gateway, or VPC endpoints)
  • Other Virtual Private Clouds (via VPC peering connections)

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Ques. 6): Is it possible to use Amazon VPC with Amazon Ec2 Reserved Instances?


Yes. When you buy Reserved Instances, you can reserve an instance in Amazon VPC. AWS does not distinguish between instances running on Amazon VPC and normal Amazon EC2 when calculating your charge. AWS optimises which instances are charged at the reduced Reserved Instance rate, ensuring you pay the least amount possible. However, your instance reservation will be specific to Amazon VPC; for more information, visit the Reserved Instances page.

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Ques. 7): Is it possible for Amazon Ec2 instances within a Vpc to communicate with Amazon Ec2 instances outside of the Vpc?


Yes, it is correct. If an Internet gateway is set up, Amazon VPC traffic destined for Amazon EC2 instances outside of a VPC passes through the Internet gateway before entering the public AWS network to reach the EC2 instance. The traffic traverses the VPN connection, egresses from your datacenter, and then re-enters the public AWS network if an Internet gateway has not been established, or if the instance is in a subnet configured to route through the virtual private gateway.

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Ques. 8): What is ELB (Elastic Load Balancing) and how does it effect Virtual Private Cloud?


ELB is a load balancer service for AWS deployments, as the name implies. A load balancer spreads the amount of work that a computer must complete into other computers, allowing it to be completed faster. ELB distributes incoming application traffic to numerous destinations, such as EC2 instances, in the same way.

There are three types of ELBs that assure scalability, availability, and security for fault-tolerant applications. There are three types of load balancers: traditional, network, and application load balancers. VPC can be used in conjunction with network and application load balancers, which can route traffic to targets within VPCs.

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Ques. 9): What Are The Amazon Vpc Components?


Amazon VPC comprises a variety of objects that will be familiar to customers with existing networks:

  • A Virtual Private Cloud (VPC): A logically isolated virtual network in the AWS cloud. You define a VPC’s IP address space from a range you select.
  • Subnet: A segment of a VPC’s IP address range where you can place groups of isolated resources.
  • Internet Gateway: The Amazon VPC side of a connection to the public Internet.
  • NAT Gateway: A highly available, managed Network Address Translation (NAT) service for your resources in a private subnet to access the Internet.
  • Hardware VPN Connection: A hardware-based VPN connection between your Amazon VPC and your datacenter, home network, or co-location facility.
  • Virtual Private Gateway: The Amazon VPC side of a VPN connection.
  • Customer Gateway: Your side of a VPN connection.
  • Router: Routers interconnect subnets and direct traffic between Internet gateways, virtual private gateways, NAT gateways, and subnets.
  • Peering Connection: A peering connection enables you to route traffic via private IP addresses between two peered VPCs.
  • VPC Endpoint for S3: Enables Amazon S3 access from within your VPC without using an Internet gateway or NAT, and allows you to control the access using VPC endpoint p
  • LI>Egress-only Internet Gateway: A stateful gateway to provide egress only access for IPv6 traffic from the VPC to the Internet.

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Ques. 10): In a VPC, what IP address range can be used?


For the principal CIDR block, you can use any IPv4 address range, including RFC 1918 or publicly routable IP ranges. Certain restrictions apply to secondary CIDR blocks. Publicly routable IP blocks can only be reached via the Virtual Private Gateway and cannot be reached via the Internet gateway. Customer-owned IP address blocks are not advertised on the Internet by AWS. Call the necessary API or use the AWS Management Console to assign an Amazon-provided IPv6 CIDR block to a VPC.

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Ques. 11): What Is The Difference Between A Vpc's Security Groups And Network Acls?


A VPC's security groups define which communication is permitted to and from an Amazon EC2 instance. Network ACLs assess traffic entering and exiting a network at the subnet level. Allow and Deny rules can be set using network ACLs. Traffic between instances in the same subnet is not filtered by network ACLs. Furthermore, network ACLs filter in a stateless manner, whereas security groups filter in a stateful manner.

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Ques. 12): You Really Want To Use My Ec2 Account's Default Vpc? Is that even conceivable?


Yes, but we can only enable an existing account for a default VPC if that account has no EC2-Classic resources in that region. All non-VPC deployed Elastic Load Balancers, Amazon RDS, Amazon ElastiCache, and Amazon Redshift resources in that region must also be terminated. All future resource launches, including instances created via Auto Scaling, will be placed in your default VPC after your account has been configured for a default VPC. Contact AWS Support to get your existing account set up with a default VPC. To see if you're eligible for a default VPC, we'll look at your request as well as your existing AWS services and EC2-Classic presence.

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Ques. 13): What Is The Best Way To Tell If My Account Is Set To Use A Default Vpc?


The Amazon EC2 console shows you which platforms you can use to launch instances in the selected region, as well as whether you have a default VPC there. In the navigation bar, make sure the region you'll be using is selected. Look under "Account Attributes" on the Amazon EC2 console dashboard for "Supported Platforms." If both EC2-Classic and EC2-VPC are present, you can start instances on either platform. You can only launch instances into EC2-VPC if there is only one value, EC2-VPC. If your account is configured to use a default VPC, your default VPC ID will be presented under "Account Attributes". You can also use the EC2 DescribeAccountAttributes API or CLI to describe your supported platforms.

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Ques. 14): How to build a custom VPC?


In order to build a custom VPC, the following steps must be followed:

  • Create a Virtual Private Cloud
  • Then create Subnets
  • Further create an Internet Gateway
  • Attach this new Gateway to your VPC
  • Create a new Route Table
  • Add the gateway as a route to the new route table
  • Add a subnet to the route table’s subnet association
  • Create a web server for public subnet and a database server for the private subnet
  • Create a new security group for the NAT
  • Add HTTP and HTTPS inbound rules that let in traffic from the private subnets IP
  • Create a NAT for public subnet
  • Create an elastic IP
  • Associate this IP to the NAT
  • Disable destination/source checks for the NAT
  •  Add NAT to the initial VPC route table as a route.

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Ques. 15): When it comes to filtering, what's the difference between stateful and stateless?


Stateful filtering keeps track of the origin of a request and can send the response back to the original machine automatically. A stateful filter that enables inbound traffic to TCP port 80 on a web server, for example, will allow return traffic on a higher-numbered port (e.g., destination TCP port 63, 912) to pass through the stateful filter between the client and the webserver. The filtering device keeps track of the origin and destination port numbers and IP addresses in a state table. On the filtering device, only one rule is required: Allow inbound traffic on TCP port 80 to the web server.

Stateless filtering, on the other hand, merely looks at the source or destination IP address, as well as the destination port, regardless of whether the traffic is a new request or a response to a request. In the case above, the filtering device would need to implement two rules: one to allow traffic incoming to the web server on TCP port 80, and another to allow traffic outward from the web server (TCP port range 49, 152 through 65, 535).

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Ques. 16): What is Classiclink, exactly?


VPC (Virtual Private Cloud) by Amazon (VPC) ClassicLink allows EC2 instances running on the EC2-Classic platform to communicate with VPC instances through private IP addresses. To use ClassicLink, you must first enable it for a VPC in your account and then link a Security Group from that VPC to an EC2-Classic instance. All of your VPC Security Group's policies will apply to communications between EC2-Classic instances and VPC instances.

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Ques. 17): What is the best way to link a VPC to my corporate datacenter?


By establishing a hardware VPN connection between your existing network and Amazon VPC, you can communicate with Amazon EC2 instances within a VPC as if they were on your local network. On Amazon EC2 instances in a VPC accessible via a hardware VPN connection, AWS does not execute network address translation (NAT).

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Ques. 18): How do I specify the Availability Zone in which my Amazon EC2 instances will be launched?


When you create an Amazon EC2 instance, you must provide the subnet on which the instance will run. The instance will be deployed in the Availability Zone that corresponds to the subnet given.

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Ques. 19): Why can't you ping the router that joins my subnets, or my default gateway?


Ping (ICMP Echo Request and Echo Reply) requests to your VPC's router are not supported. Pinging between Amazon EC2 instances within a VPC is possible if your operating system's firewalls, VPC security groups, and network ACLs allow it.

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Ques. 20): Is It Possible To Control And Manage Amazon Vpc Using The AWS Management Console?


Yes, it is correct. VPCs, subnets, route tables, Internet gateways, and IPSec VPN connections can all be managed through the AWS Management Console. You can also construct a VPC with the help of a simple wizard.

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