Amazon Virtual Private Cloud

Updated: Jun 16

A quick summary view of Amazon VPC and its components. This representation may be easier to remember before going to exam.

  • Amazon Virtual Private Cloud (VPC) is a proprietary cloud services of Amazon. The VPC resembles a traditional data center with various services offered on the cloud.

  • A VPC region is a geographical location where your data center is present.

  • A VPC must be created in a single region and it cannot span regions.

  • An Availability Zone is a distinct location within a region that provides low-latency network connectivity to other AZs in the same region.

VPC High Level Architecture


Following diagram shows the architecture of a typical virtual private cloud and how components are connected.


Subnet


  • A VPC is broadly divided into Subnets.

  • A subnet defines the IP range of your VPC.

  • In general, there should be a minimum of 2 subnets in a VPC.

  • EC2 instances are always launched in a subnet under a VPC.

  • In the below diagram, the subnets have been highlighted in green.


Route Table


  • A Route table defines the rules for routing the traffic in and out of the instances in the subnet.

  • By default, all routing rules are set to only local destination. One should add a new route to the desired destination.

  • It is always recommended to have a separate route table for private and public subnets.

  • In the below diagram, the route tables have been highlighted in green.

Internet Gateway


  • This is the main gateway that allows communication between your VPC and the Internet.

  • A VPC needs to be attached to an Internet Gateway in order to enable the communication

  • A new route need to be added with destination as IGW in order to allow instances in a subnet to communicate with Internet

  • In the below diagram, the internet gateway has been highlighted in green.


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