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 the difference between an AWS Region and an Availability Zone?
A Region is a separate geographic area, like Mumbai, with its own set of data centres. An Availability Zone is one or more isolated data centres inside a Region, with its own power and networking. You spread an app across AZs to survive a data-centre failure, and across Regions to survive a whole-area outage or to be closer to users.
BeginnerIn-depth3 min read - What is the difference between RDS Multi-AZ and a read replica?
Multi-AZ keeps a synchronous standby copy in another AZ for automatic failover, improving availability. A read replica is an asynchronous copy that serves read traffic to scale performance and can be promoted if needed.
BeginnerQuick answer1 min read