You delete the Internet Gateway from your default VPC. What is the impact

the EC2 instances lose the internet connectivity even if we have public ip, the route table become invalid config for igw, all the due to this all inbound connection can't reach the destination.

Difference between S3 Standard-IA and S3 Glacier

S3 Standard- infrequent access :
> when the data infrequently access and retrieved fast we opt this type, it retrieves data in milliseconds and its minimum period of storage is 30 days.

S3 Galcier:
its used when the data very rarely accessed like archival data, its very low in cost, it retrieves data minutes to hour depends on the Glacier option selected like expedited, bulk, standard and minimum storage time is 90days