S3 Storage Tiers To store data with efficiency while maintaining high availability, you can also select from several storage classes in S3. The following storage classes are available: S3 Standard: Provides general-purpose online storage with 99.99 percent availability and 99.999999999 percent durability (aka “11 nines”). S3 Infrequent Access: Provides the same performance as the S3 […]

Highly Available Datastores This chapter covers the following official AWS Certified SysOps Administrator – Associate (SOA-C02) exam domain: Domain 2: Reliability and Business Continuity CramSaver If you can correctly answer these questions before going through this section, save time by skimming the Exam Alerts in this section and then completing the Cram Quiz at the […]

ExamAlert Although many services support Secure Sockets Layer (SSL), you should avoid using SSL in your applications because it is not considered secure anymore due to a flaw in its design. When SSL is referenced in the documentation, this might also be used as a general placeholder for “in-transit encryption.” Most AWS services fully support […]

High Availability with Elastic Load Balancers and Route 53 This section covers the following official AWS Certified SysOps Administrator – Associate (SOA-C02) exam domains: Domain 2: Reliability and Business Continuity Domain 5: Networking and Content Delivery CramSaver If you can correctly answer these questions before going through this section, save time by skimming the Exam […]

Private Subnets A private subnet within a VPC has no access to or from the Internet; however, it is by default accessible and can access all other private and public subnets in the VPC because the default routing in the VPC targets the entire VPC CIDR range. You can connect private subnets via VPN or […]

VPC Any applications where high availability needs to be deployed and maintained by the customer must be deployed in the AWS Virtual Private Cloud (VPC) service. The network service enables you to define both public and private network environments, with complete control over the routing and granular security of the network. A VPC requires you […]

ExamAlert Not all scalable applications are inherently elastic.for example, an application that only supports vertical scaling. Not all elastic applications are inherently highly available.for example, a horizontally scalable application in one availability zone. Not all highly available applications are inherently resilient.for example, an application distributed across two availability zones with each location able to handle […]

This chapter covers the following official AWS Certified SysOps Administrator – Associate (SOA-C02) exam domains: Domain 2: Reliability and Business Continuity Domain 5: Networking and Content Delivery (For more information on the official AWS Certified SysOps Administrator – Associate [SOA-C02] exam topics, see the Introduction.) CramSaver If you can correctly answer these questions before going […]

Cram Quiz Answer these questions. The answers follow the last question. If you cannot answer these questions correctly, consider reading this section again until you can. 1. You have been instructed to eliminate any inefficiencies in the following deployment: Web tier: EC2 autoscaling group scaling on CPU usage, 30% floor, 70% ceiling, minimum 1, maximum 10. […]

ExamAlert Traditional RDS database read replicas are a very cost-efficient way to provide data for small (terabyte)-scale analytics and should be selected as a preferred option when the entire dataset needs to be read offloaded. Always evaluate whether the question requires you to offload a certain portion of the data (with caching) or the entire […]