Complement and Negation Operators Since we’re going to be working with a lot of numeric operators in this chapter, let’s get the boolean one out of the way first. The logical complement operator (!) flips the value of a boolean expression. For example, if the value is true, it will be converted to false, and […]

NACLs NACLs are a type of security control used in VPC environments that act as a firewall for inbound and outbound traffic at the subnet level. They are stateless, meaning that they apply to all traffic regardless of the connection state. The primary role of NACLs in VPC security is to provide an additional layer […]

8.1 Execution Context In Apex, there are two types of execution contexts such as system execution context and user execution context. User execution context is when a user clicks a button or link, for example, that executes Apex code. When a system event or process executes Apex code, a system execution context is created. Apex […]

Multi Protocol Label Switching Multi Protocol Label Switching (MPLS) is a networking architecture commonly used in telecommunications networks and has replaced traditional IP routing. Labels, or tags, are used to create a predefined path through the carrier’s wide-area network. MPLS networks are a common offering by service providers and telephone companies worldwide and are widely […]

Model tuning In Chapter 7, Evaluating and Optimizing Models, you learned many important concepts about model tuning. Let’s now explore this topic from a practical perspective. In order to tune a model on SageMaker, you have to call create_hyper_parameter_tuning_job and pass the following main parameters: In SageMaker, the main metric that you want to use […]

Reusing Common Patterns As your environment expands on AWS, you may identify a need to reuse the same resource configurations over and over from one stack to the next across teams or projects. For instance, you may want to implement best practices across various projects by enforcing some specific guidelines in their infrastructure resource configurations, […]

The golden record As we now know, the golden record, or single source of truth, is essentially a data record where the definitive source of information is stored in order to orchestrate business operations. Users should be able to view a golden record to see the correct version of a piece of information. While the […]

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 want to identify and count requests that are hitting a web application from varying on-premises datacenters. All datacenters are in the same country but have different IP address […]

Operator Precedence When reading a book or a newspaper, some written languages are evaluated from left to right, while some are evaluated from right to left. In mathematics, certain operators can override other operators and be evaluated first. Determining which operators are evaluated in what order is referred to as operator precedence. In this manner, […]

TCP/IP Transport Layer Although many TCP/IP application layer protocols exist, the TCP/IP transport layer includes a smaller number of protocols. The two most commonly used transport layer protocols are the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP). Transport layer protocols provide services to the application layer protocols that reside one layer higher […]