Practice Test

True or False: Availability Zones in AWS are interconnected data centres within the same region.

  • True
  • False

Answer: True

Explanation: Availability Zones are connected locations within an AWS region that are engineered to be isolated from failures that might impact other zones and provide inexpensive, low-latency network connectivity to other zones in the same region.

How many availability zones does AWS recommend for high availability?

  • a) One
  • b) Two
  • c) Three
  • d) Four

Answer: b) Two

Explanation: At a minimum, AWS recommends designing your applications to span two availability zones for high availability.

True or False: Replicating instances in multiple Availability Zones within the same region can provide a highly available solution.

  • True
  • False

Answer: True

Explanation: Doing so provides the ability to failover to the secondary instance, in the event of a failure of the primary one, hence increasing the availability.

True or False: All resources in AWS are automatically replicated across different Availability Zones for high availability.

  • True
  • False

Answer: False

Explanation: Only specific AWS resources, such as Amazon RDS or Amazon Aurora databases, are automatically replicated across Availability Zones. For other resources, you must configure replication manually.

Is it necessary to use multiple regions to achieve high availability in AWS?

  • a) Yes
  • b) No

Answer: b) No

Explanation: High availability can be achieved within a single AWS region by using multiple Availability Zones. It’s not necessary to use multiple regions unless you have other requirements, like reducing latency for users around the world.

True or False: Using multiple availability zones can help to avoid a single point of failure.

  • True
  • False

Answer: True

Explanation: Using multiple availability zones contributes to a well-architected multi-tier application set up, helping to avoid a single point of failure.

With AWS, which load balancing option distributes traffic across multiple availability zones automatically?

  • a) Network Load Balancer
  • b) Application Load Balancer
  • c) Classic Load Balancer

Answer: b) Application Load Balancer

Explanation: The Application Load Balancer automatically distributes incoming application traffic across multiple targets, such as EC2 instances, and across multiple availability zones.

True or False: Using Amazon RDS Multi-AZ deployments, you can achieve automatic failover support for DB instances.

  • True
  • False

Answer: True

Explanation: Amazon RDS Multi-AZ deployments provide enhanced availability and durability for database (DB) instances, making them a fit for production workloads.

True or False: Costs may increase while using multiple Availability Zones in AWS.

  • True
  • False

Answer: True

Explanation: While using multiple Availability Zones can increase service availability, it can also lead to additional costs due to factors such as data transfer between Zones.

Can you replicate Amazon EBS Snapshots across regions for high availability?

  • a) Yes
  • b) No

Answer: a) Yes

Explanation: Amazon EBS Snapshots can be replicated across regions which can increase data availability and redundancy.

True or False: Multiple Availability Zones can offer high availability but they cannot improve the performance of your application.

  • True
  • False

Answer: False

Explanation: Using multiple Availability Zones not only increases availability but can also improve the performance of your applications by providing low-latency network connectivity.

With Amazon S3, high availability can be achieved by:

  • a) Keeping all the data in one bucket
  • b) Using Multi-AZ
  • c) None of the above

Answer: b) Using Multi-AZ

Explanation: Amazon S3 is designed for 999999999% (11 9’s) of durability, and stores copies of your object across multiple systems across multiple Availability Zones, not just one, in an Amazon S3 bucket for high availability.

Interview Questions

What does AWS Availability Zone (AZ) provide by design?

Each AZ provides high availability, data durability, and low latency.

What fundamental design concept allows for high availability architecture in AWS?

Distributing applications across multiple, early isolated AZs in the same region.

How can you mitigate the impact of individual server failure?

By launching Instances in separate Availability Zones.

How does data replication across multiple AZs contribute to high availability?

Data replication across multiple AZs increases data durability and protects your applications from the effects of both hardware and software failure.

How do you ensure your database remains operational during AZ downtime?

By setting up your database to run in a Multi-AZ deployment.

What is Amazon RDS Multi-AZ deployments?

Amazon RDS Multi-AZ deployments provide an automatic replica of your database in a different Availability Zone for failover support for DB instances.

What is Amazon EC2 Auto Scaling?

Amazon EC2 Auto Scaling helps maintain application availability and allows for dynamic scaling of your Amazon EC2 capacity across multiple Availability Zones.

Which AWS service helps distribute incoming application traffic?

Amazon Elastic Load Balancing (ELB) can distribute incoming application traffic across multiple targets, such as EC2 instances, in multiple Availability Zones.

Can Amazon EC2 instances in one AZ communicate with Amazon EC2 instances in another AZ?

Yes, instances from different AZs can communicate with each other as they are connected through low latency, high throughput networks.

How does Amazon S3 contribute to high availability in AWS?

Amazon S3 will automatically and transparently replicate your data to another Availability Zone for increased durability.

How does AWS Elastic Beanstalk manage high availability and scalability?

Elastic Beanstalk allows automatic scaling of applications by adjusting capacity in response to changing demand and also balances load across multiple instances.

How does Amazon Aurora maintain high availability in AWS?

Aurora automatically replicates data across multiple AZs and supports automatic failover to a standby DB instance in the case of a failure.

What does AWS Route 53 do to assure high availability?

AWS Route 53 connects user requests to the infrastructure running in AWS – such as EC2 instances, Elastic Load Balancers or S3 buckets – and can route traffic globally to multiple regions.

What is the role of AWS CloudFormation in achieving high availability?

AWS CloudFormation allows users to model and provision AWS resources so you can spend less time managing those resources and more time focusing on your applications that run on AWS.

How does Amazon CloudFront contribute to high availability?

Amazon CloudFront is a global content delivery network (CDN) service that securely delivers data, videos, applications, and APIs to your viewers with low latency and high transfer speeds. This means a high availability of content is maintained, even during high demand.

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