Interview Q&A / AWS & Cloud
AWS & Cloud interview questions
EC2, S3, Lambda, IAM and VPC basics, with when to pick which service.
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- What is Amazon S3 and what are its storage classes?
S3 is AWS's object storage. You store files as objects inside buckets and access them by key over HTTPS. Storage classes trade storage cost against access speed and retrieval cost, from S3 Standard for frequently used data to the Glacier classes for archives you rarely read.
BeginnerIn-depth4 min read - What is the difference between Amazon EFS and Amazon EBS?
EBS is a block disk attached to one EC2 instance in one AZ. EFS is a managed shared file system using NFS that many instances across multiple AZs can mount at the same time.
BeginnerQuick answer1 min read - What are the main Amazon EBS volume types and when do you use each?
gp3 and gp2 are general-purpose SSDs for most workloads. io2 and io1 are provisioned-IOPS SSDs for databases needing high, steady IOPS. st1 is throughput-optimised HDD for big sequential data, and sc1 is cold HDD for rarely used data.
IntermediateQuick answer1 min read