Load Balancer Access Log Files Even if a request never reaches the intended target, it is captured in an access log. This includes malformed requests and is especially helpful in the context of security since malformed requests can sometimes be attempts at things such as directory transversal attacks. A sample of what is contained in […]

Checking the stationarity of time series Decomposing time series and understanding how their components interact with additive and multiplicative models is a great achievement! However, the more you learn, the more you want to go deeper into the problem. Maybe you have realized that time series without trend and seasonality are easier to predict than […]

Rollbacks A rollback is a method of undoing the steps taken during a patch. In some cases, a patch may not permit a rollback. In these situations, you want to make sure you test the patch in a testing environment and make sure you back up all related data before patching a live system. You […]

Monitoring End-to-End Tracing of Requests through Your System This was slightly touched upon under canary testing. It’s good practice to validate that end-to-end requests perform as expected. Leverage AWS X-Ray, or third-party equivalent tools, to help you understand how your workload and its underlying components are performing. Tracing can also prove particularly useful for debugging, […]

3.1  Quick Actions, Page Layouts, and Record Types Quick Actions, Page Layouts, and Record Types are features that play a crucial role in defining how users interact with records and perform actions within the application. They contribute to creating a tailored user experience by determining what information is displayed and what actions are available on […]

Exercises Written Labs Written Lab 4.1: Create a Network Load Balancer Written Lab 4.2: Use the Console to Enable Deletion Protection Written Lab 4.3: Use the Console to Disable Deletion Protection Written Lab 4.4: Enable Application-Based Stickiness

VPC Traffic Mirroring VPC Traffic Mirroring, as the name implies, allows you to duplicate network traffic from ENIs attached to instances so that the duplicated traffic can then be sent to third-party tools and services for traffic analysis and inspection. When configured, the duplicated traffic is sent to a target; this could be a Network […]

Important note The term weaker is used in this context to describe very simple decision trees. Although XGBoost is much more robust than a single decision tree, it is important to go into the exam with a clear understanding of what decision trees are and their main configurations. By the way, they are the base […]

Storage Components A storage component is the underlying device where the data is stored. This can include a magnetic hard drive, a solid-state drive, or a tape device. In terms of patching, the devices themselves may require occasional firmware updates (see the next section on firmware). Additionally, the software used by an operating system to […]

Platform Event-Triggered Flow in Salesforce Flow Builder combines the capabilities of platform events and flows to automate processes based on the occurrence of platform events. A platform event is a custom object in Salesforce used to publish and subscribe to events within the Salesforce ecosystem and between Salesforce and external systems. Platform Event-Triggered Flows allow […]