ExamAlert When choosing a caching strategy, always consider the rate of data change and choose the correct time-to-live (TTL) of the data in the cache, to match the rate of change of the data. Data on an e-commerce site such as item descriptions, reviews, and images are unlikely to change frequently, but data such as […]

Organizing Accounts into OUs AWS Organizations also offers the possibility to organize your AWS accounts in a logical and hierarchical structure that best reflects your own internal organizational structure. This can be done by creating OUs that follow the structural model of your choice. Consider the following examples of different structures. In Figure 3.3, the […]

Traffic Routing Policies Routing policies are a Route 53 extension to DNS that allows you to customize query responses to affect how your content gets delivered. Routing policies shape the traffic based on our requirements in a number of different use cases. We can send all traffic to a single site, give multiple responses to […]

Processing real-time data using Kinesis Data Streams Kinesis is Amazon’s streaming service and can be scaled based on requirements. It has a level of persistence that retains data for 24 hours by default or optionally up to 365 days. Kinesis Data Streams is used for large-scale data ingestion, analytics, and monitoring: Note Amazon Kinesis shouldn’t […]

With a grasp on what you are responsible for from an AWS customer perspective, you can now turn to the pillars that will be tested in the exam. The first pillar is incident response (IR). Knowing how to prepare and then react, in both a manual and an automated fashion, when something occurs in one […]

Tag Policies Tag policies provide a means to centrally decide which tags are attached to the AWS resources across your organization. A tag policy consists of rules that define for each tag the tag key, including the capitalization preference (for example, costcenter or CostCenter), tag values that are valid (this is optional), and whether non-compliant […]

Edge Caching When content is delivered frequently to multiple users, you can employ edge caching or what is more commonly referred to as a content delivery network. In AWS, you can use the Amazon CloudFront service to deliver frequently used content in a highly efficient manner to millions of users around the globe while at […]

Resolvers DNS resolvers are at the heart of DNS functionality. Resolvers, also known as recursive resolvers, receive queries that contain the hostname and reply with the IP address of that hostname, as shown in Figure 2.7. The Route 53 Resolver acts as a bridge between your on-premise DNS infrastructure and the AWS VPC. Route 53 […]

Querying S3 data using Athena Athena is a serverless service designed for querying data stored in S3. It is serverless because the client doesn’t manage the servers that are used for computation: Now, to help you understand this, here’s an example, where you will use AWSDataCatalog created in AWS Glue on the S3 data and […]

Exam Readiness Drill For the first three attempts, don’t worry about the time limit. ATTEMPT 1 The first time, aim for at least 40%. Look at the answers you got wrong and read the relevant sections in the chapter again to fix your learning gaps. ATTEMPT 2 The second time, aim for at least 60%. […]