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Abstract classes: Contain at most one pure virtual function. Cannot have abstract derived classes. Can have objects instantiated from them if the proper permissions are set. Are defined, but the programmer never intends to instantiate any objects from them.

Ask by Colon Li. in the United States
Mar 14,2025

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Abstract classes are blueprints for other classes and cannot be instantiated directly. They can have multiple pure virtual functions and can have derived classes that are also abstract.

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Abstract classes are a fundamental part of object-oriented programming, allowing developers to define a blueprint for other classes. They can contain both abstract methods (pure virtual functions) and concrete methods. While they cannot be instantiated directly, we can create derived classes that implement the pure virtual functions, allowing us to create specific objects that leverage the shared interface and functionality. In real-world software development, abstract classes are invaluable for designing frameworks or libraries. For instance, if you're creating a graphics library, you might have an abstract class named `Shape` with methods like `draw()` and `resize()`. Specific shapes like `Circle` or `Rectangle` would derive from `Shape`, providing their implementations. This approach enhances code organization and promotes reuse while ensuring that all shapes adhere to a common contract.

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To answer this question, complete the lab using the information below. You have been asked to add a VPN connection on a laptop computer in your organization. The sales team uses this computer to deliver sales presentations. They need to establish a secure connection to the company network while working on the road. You need to choose a VPN type that operates using firewall ports that are commonly left open. You also need to use the most secure password-based authentication possible without using a smart card. In this lab, your task is to configure and establish a VPN connection on the Office2-Lap using the following information: - Add a VPN Connection as follows: - VPN provider: Windows (built-in) - Connection name: SalesVPN - Server name or address: 198.10.20.12 - VPN type: Secure Socket Tunneling Protocol (SSTP) (SSTP works by encapsulating PPP traffic over the SSL channel of the HTTPS protocol. This type of VPN runs on port 443, which is typically left open-in most network firewalls.) - Type of sign-in info: User name and password - Don't allow Windows to remember authentication credentials - Set VPN security properties to meet the following requirements: - VPN type: Secure Socket Tunneling Protocol (SSTP) - Authentication: Microsoft: Secured password (EAP-MSCHAP V2) (encryption enabled) (This is the most secure password-based authentication protocol.) - Connect to the VPN as follows: - Username: MaryS49 - Password: Sm@rt72\# (i) It isn't necessary to specify a domain when configurring this connection.
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