No matter the size of the business, all of them are trying to move towards cloud computing. This could be to streamline their business model, reduce cost, or even increase security and manage risks. Now, when it comes to adopting cloud computing and you think of any cloud service provider, the first name that pops up is Amazon Web Services (AWS). AWS provides several resources to provide a seamless cloud experience. One such service provided by AWS is Amazon Virtual Cloud (VPC)
Amazon Virtual Private Cloud or Amazon VPC is an AWS service that provides you with a separate area of the cloud. Having this separate area, you can launch your own defined AWS services in a virtual network.
Here, in VPC you have complete control of your virtual environment which includes IP address range, the configuration of route tables, the creation of subnets, and network gateways. Also, the network configurations can be easily customised for the Amazon VPC.
Like all the other AWS services, Amazon VPC provides top-notch security. It has multiple layers of security which include network access control lists and security groups to manage the Amazon EC2 instances’ access in each subnet.
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Now to understand the entire scenario of VPC, even better, let's have a look at the architecture of VPC.
Now, when we know about the architecture of VPC, it's time to understand the different elements of VPC.
The elements included in the Amazon VPC are:
VPC IP addresses use CIDR (Classless Interdomain Routing) IPv6 and IPv4 blocks to define their ranges. Primary and secondary CIDR blocks can be added to the VPC if the secondary Classless Interdomain Routing block comes from a similar address range as the primary block.
The EC2 Instance that is launched runs inside a specific VPC subnet. And, each subnet’s CIDR as a subset of the VPC Classless Interdomain Routing block. Every subnet separates its respective traffic from all the other VPC subnet traffic. It must be noted that a subnet can only have one CIDR block and different subnets are to be designated to handle diverse traffic types.
Route Tables are actually the rule book that decides how much network traffic must be directed inside the VPC and subnets. A default route table is created by the VPC called the main route table. And, this main route table has an automatic association with other VPC subnets.
There are two options - either the main route table can be updated and used to direct network traffic OR a new route table can be created for individual subnet traffic.
Each VPC configuration is able to host one Internet Gateway and hence provide NAT or the Network Address Translation services using a NAT Gateway or NAT instances.
Elastic IP Addresses or EIPs are IPv4 addresses permanently allocated to the user’s AWS account. The EIPs enable public internet access to the following:
In the VPC architecture, you had seen there’s something called the “security group,” so VPCs use those security groups to give protection for instances. These security groups are referred to as firewalls by AWS.
There are several more services provided by a VPC. The VPC can also be used to configure the following:
Now, when you are well versed with the basics of Amazon VPC, let’s have a look at what you can do with a VPC.
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By now you would be well versed with everything you need to begin with Amazon Virtual Cloud. In the beginning, we learnt the basics of Amazon VPC and continued to learn its architecture. While at the architecture of VPC, we saw different parts of it and saw each of them briefly.
Once you knew all the architectural parts, you saw the elements of VPC and studied them in brief. Finally, after learning about different elements and several other basics of Amazon Virtual Cloud, we saw the applicability of the same.
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