Exam AWS Certified Cloud Practitioner topic 1 question 313 discussion

Amazon Elastic File System (Amazon EFS) and Amazon S3 are both designed to provide high availability and durability by default. Amazon EFS automatically stores data across multiple Availability Zones within a region to provide high availability and durability, while Amazon S3 stores data across multiple facilities and multiple devices within those facilities to provide high availability and durability. A. Amazon EC2 provides high availability by using Auto Scaling groups and Elastic Load Balancing to distribute traffic across multiple instances in multiple Availability Zones, but it requires configuration to achieve high availability. B. Amazon Elastic Block Store (Amazon EBS) provides high availability by replicating data within an Availability Zone, but it does not replicate data across multiple Availability Zones by default. D. Amazon Redshift is a data warehouse service that provides high availability by replicating data within an Availability Zone, but it does not replicate data across multiple Availability Zones by default.

CE is correct! S3 and EFS https://www.amazonaws.cn/en/efs/faq/#:~:text=By%20default%2C%20every%20Amazon%20EFS,stored%20within%20a%20single%20AZ.

Amazon Elastic File System (Amazon EFS) and Amazon S3 are both designed to provide high availability and durability by default.

A. Amazon EC2 E. Amazon S3 Amazon EC2 instances and Amazon S3 are designed to be highly available and fault-tolerant by distributing resources across multiple Availability Zones, making them reliable choices for building applications that require high availability and redundancy. Keep in mind that while Amazon EBS (Amazon Elastic Block Store) and Amazon EFS (Amazon Elastic File System) can be used in a multi-Availability Zone configuration, they may not be configured for high availability by default and require some additional setup for redundancy. Amazon Redshift is primarily a data warehousing service and does not inherently offer multiple Availability Zone support.

according to chatgpt is not c.because a service like Amazon Elastic File System (Amazon EFS) does not automatically operate across multiple Availability Zones to ensure high availability.

C. Amazon Elastic File System (Amazon EFS) E. Amazon S3

A. Amazon EC2 (Elastic Compute Cloud): When you launch Amazon EC2 instances in an AWS region, they are automatically distributed across multiple Availability Zones (AZs) to provide fault tolerance and high availability. C. Amazon Elastic File System (Amazon EFS): Amazon EFS automatically replicates data across multiple Availability Zones within a region to provide high availability and durability. E. Amazon S3 (Simple Storage Service) also provides high durability and availability, but it does not automatically replicate data across Availability Zones by default. Instead, Amazon S3 offers cross-region replication for high durability across different regions. Therefore, the correct answers are A and C.

The two AWS services that provide high availability across multiple Availability Zones by default are: A. Amazon EC2 E. Amazon S3 Amazon EC2 (Elastic Compute Cloud) instances can be launched in multiple Availability Zones, which ensures redundancy and availability in case of failure in one zone. Amazon S3 (Simple Storage Service) automatically replicates data across multiple Availability Zones within a region, providing durability and availability for stored objects. Therefore, options A and E are the correct answers.

Researched this on AWS. If not the reason, you could try and remember this as "Basic storage needs to remain intact, therefore multi-AZ by default" though I wonder what the real reason is.

https://bluexp.netapp.com/blog/understanding-aws-high-availability-compute-sql-and-storage#:~:text=Compute%E2%80%94Amazon%20EC2,to%20different%20AZs.

C. Amazon Elastic File System (Amazon EFS) When you create EFS in the console if you do not specific storage class to be single AZ, It will be provide EFS Standard storage class and by default EFS Standard provided multi AZ. E. S3, No doubt. Why not EC2, As I recheck there is no option when you create EC2 that specific it to create in multi AZ and as my understanding, when we talk about multi AZ for EC2 it is an architecture that you create more than one EC2 and place it in difference AZ and you let it work together through Load Balancer.

B and C (ans From AI) The two AWS services that provide high availability across multiple Availability Zones by default are: B. Amazon Elastic Block Store (Amazon EBS) C. Amazon Elastic File System (Amazon EFS) Both Amazon EBS and Amazon EFS replicate data across multiple Availability Zones by default to provide high availability and durability. Amazon EBS replicates data within an Availability Zone and asynchronously replicates it to another Availability Zone within the same region. Amazon EFS, on the other hand, replicates data across multiple Availability Zones within the same region automatically. Amazon EC2, Amazon Redshift, and Amazon S3 can provide high availability across multiple Availability Zones, but it requires additional configuration and setup.

high availability across multiple Availability Zones by default are: Amazon S3: Amazon S3 automatically stores multiple copies of objects across multiple Availability Zones in a region. This provides high availability and durability for objects stored in S3. Amazon Elastic File System (Amazon EFS): Amazon EFS automatically replicates data across multiple Availability Zones within a region, providing high availability and durability for file systems.

Please note the stem 'by default'!!!!!! EFS support multiple-AZ, but not default, please see https://docs.aws.amazon.com/efs/latest/ug/storage-classes.html S3 is no doubts. For EC2, when you understand the stem 'BY DEFAULT', you will choose it. see https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html

The question is not correctly formulated since nothing specified regarding is availability is related to compute or storage services (or both), since EC2 is also "provide high availability features across Amazon Availability Zones". Therefore it looks like correct answers here must be A C E.

Amazon Elastic Block Store (EBS) provides high availability by replicating data across multiple Availability Zones, ensuring that data is available even in the event of an AZ failure. Amazon S3 also provides high availability by replicating data across multiple Availability Zones, and the default configuration for S3 buckets is to store data in multiple AZs.

A. Amazon EC2: EC2 instances can be launched in multiple Availability Zones within a region, providing automatic failover and high availability for applications. AWS provides an SLA of 99.99% availability for EC2 instances running in multiple Availability Zones. E. Amazon S3: S3 automatically stores data across multiple Availability Zones within a region, providing automatic failover and high availability. S3 provides an SLA of 99.99% availability for standard storage classes.