Multi-AZ deployment for high availability in AWS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does Multi-AZ deployment mean in AWS?

Multi-AZ deployment means running your application or database across multiple Availability Zones to improve availability and fault tolerance.

beginner

Why is Multi-AZ deployment important for high availability?

It protects your system from failures in a single data center by automatically switching to a healthy zone, reducing downtime.

intermediate

How does AWS RDS use Multi-AZ deployment?

AWS RDS creates a synchronous standby replica in a different Availability Zone and automatically fails over if the primary instance fails.

beginner

What is an Availability Zone in AWS?

An Availability Zone is a separate physical data center within an AWS region designed to be isolated from failures in other zones.

intermediate

Can Multi-AZ deployment improve performance?

Multi-AZ mainly improves availability and fault tolerance, but it does not improve performance because standby instances are not used for read traffic.

What is the main benefit of Multi-AZ deployment?

A Improved availability and fault tolerance

B Lower cost of infrastructure

C Faster data processing

D Simpler application code

Multi-AZ deployment is designed to improve availability and fault tolerance by spreading resources across multiple zones.

In AWS RDS Multi-AZ, what happens if the primary database fails?

A Manual restart of the primary instance

B Automatic failover to standby in another AZ

C Data loss occurs

D The application stops working

AWS RDS automatically fails over to the standby replica in another AZ to minimize downtime.

Which of the following is true about Availability Zones?

A They are only used for backups

B They are the same as AWS regions

C They are virtual machines

D They are isolated data centers within a region

Availability Zones are physically separate data centers within an AWS region to provide fault isolation.

Does Multi-AZ deployment improve read performance by default?

A No, standby instances do not serve read traffic

B Yes, it doubles read speed

C Yes, but only for write operations

D No, it only improves security

Standby instances in Multi-AZ are passive and do not serve read traffic, so read performance is not improved.

Which AWS service commonly uses Multi-AZ deployment for high availability?

A AWS Lambda

B Amazon S3

C Amazon RDS

D Amazon CloudFront

Amazon RDS supports Multi-AZ deployments to increase database availability.

Explain how Multi-AZ deployment helps maintain application availability in AWS.

Think about what happens if one data center fails.

Describe the difference between an Availability Zone and a Region in AWS.

Consider the AWS global infrastructure hierarchy.