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Ans. High bandwidth and availability in NAT Gateway
NAT Gateway is completely managed by AWS
NAT Gateway is auto scalable
NAT Instance is just like EC2 instance and hence backed by security group
NAT Instance can be used as bastion host whereas NAT Gateway cannot be.
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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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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. 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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Q48. A company is planning to store documents in AWS storage, their requirement is initially when they store any documents they need to be available readily to download and after 15 days documents need not be readily available to download. Which type of storage will you choose?
Ans. EFS is file storage whereas S3 is object storage.
EFS is filesystem presented over IP network as normal OS drive, while S3 is HTTP accessed store.
EFS is capable of being mounted whereas S3 doesn't.
S3 has capabilities beyond just filesystem, there is whole metadata part where you can store info about your objects in S3.
As S3 is accessed over http , it's capable of hosting a static web site on it's own whereas EFS needs a computing and frontend service to have such capability.
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Ans. If instances in private subnet need to access internet without exposing the IP address to outside world , we use Nat gateway or nat instance. So there is a direct outbound traffic but not direct inbound traffic.
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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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