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Ans. A VPC is devided into multiple subnets. Subnet in a particular VPC could be public or private.
For Example - A particular account may have multiple vpc's for each of the business type. For each Business or VPC , One can have different subnets to cater to each department so that access across departments could be restricted. But still there could be identities that have control over different subnets. Moreover we could have multiple subnets for each department so as to have distinguished public and private networks having different types of applications ( public facing or internal consumption )
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Ans. VPC stands for Virtual Private Cloud. You can define a VPC and subnets for a region in AWS and that can be used to access shared resources on the cloud. For eg: API gateway to access any file on S3.
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Ans. Internet gateway is a public gateway i.e allows direct http access whereas Virtual private gateway doesn't allow direct http access ( through VPN )
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Ans. Source / destination check means that the instance should wither be a source or end destination as a security check. The purpose of NAT Instance is to provide a gateway for internet access and hence this needs to be unchecked.
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