Jasmine is the most commonly used testing framework for unit testing in Angular applications. It provides a rich set of features for writing and running tests, including matchers for assertions and spies for tracking function calls.

The primary purpose of Angular's ngIf directive is to conditionally show or hide elements in the DOM based on a given condition. This is useful for displaying or hiding parts of a user interface depending on the application's state or user interactions. The other options do not accurately describe the main purpose of ngIf.

To update your Angular CLI globally to the latest version, you would use the command npm install -g @angular/cli. This command installs or updates the Angular CLI package globally, ensuring you have the latest version available.

The directive used to manipulate the DOM structure by adding or removing elements conditionally is prefixed with *ngIf in Angular. It allows you to control whether an element is rendered based on a given condition. The other options, like *ngFor, *ngSwitch, and *ngStyle, are used for different purposes in Angular and do not add or remove elements from the DOM.

To capture and act upon route parameters in Angular, you would use ActivatedRouteSnapshot and RouteParams. These are part of the Angular Router and provide access to the parameters passed in the URL, allowing you to utilize them in your components. The other options may be components of the Angular Router, but they are not the primary tools for capturing and acting upon route parameters.

In this scenario, to ensure only relevant components are re-rendered upon data changes, you should use Pure Components. Pure Components are optimized to re-render only when their input properties change, and they don't have side effects. Memoization (Option 1) can be used for caching expensive calculations but doesn't handle re-rendering. Dynamic Imports (Option 3) and Lazy Loading (Option 4) are related to code splitting and module loading, not component rendering optimization.

To add a new capability or library to your Angular application, such as Angular Material, you can use the "ng add" command. This command not only installs the library but also performs any necessary configuration, making it a convenient way to enhance your project.

In Angular, the CanDeactivate guard is used to decide if the current route can be deactivated. It's often used to prompt users for confirmation before leaving a page with unsaved changes.

To ensure that Angular's AOT compiler is used when building your application for production, you should use the ng build --aot command. AOT compilation improves runtime performance and reduces bundle size by pre-compiling Angular templates.

For managing a consistent state across multiple components and services in Angular, you would consider using NgRx Store. NgRx is a state management library that allows you to maintain a centralized, immutable state in your application, making it easier to manage and share state data among various parts of your app.