AWS VPC “ What is VPC , Subnet, Routing Table & IGW ? ”

What is VPC ?

• A virtual private cloud (VPC) is a virtual network dedicated to your AWS account.
• It is logically isolated from other virtual networks in the AWS cloud.
• This virtual network closely resembles a traditional network that you’d operate in your own data center.
• You can launch your AWS resources, such as Amazon EC2 instances, into your VPC.

What is Subnet?

• A subnet is a range of IP addresses in your VPC.
• You can launch AWS resources into a subnet that you select.
• Use a public subnet for resources that must be connected to the Internet
• Use a private subnet for resources that won’t be connected to the Internet.

What is Routing Table?

• A route table contains a set of rules, called routes, that are used to determine where network traffic is directed.
• Each subnet in your VPC must be associated with a route table; the table controls the routing for the subnet.
• A subnet can only be associated with one route table at a time, but you can associate multiple subnets with the same route table.

What is Internet Gateway (IGW) ?

• An Internet gateway is a horizontally scaled, redundant, and highly available VPC component that allows communication between instances in your VPC and the Internet.
• It therefore imposes no availability risks or bandwidth constraints on your network traffic.
• An Internet gateway serves two purposes:
• Provide a target in your VPC route tables for Internet-routable traffic.
• Perform network address translation (NAT) for instances that have been assigned public IP addresses.

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