Virtual Machines and Operating Systems: Structures

Posted by on Feb 9, 2025 in Computers | 0 comments

Virtual Machines

A virtual machine (VM) is software that emulates a computer system, capable of running programs like a physical computer. Initially, VMs were defined as “an efficient, isolated duplicate of a physical machine.” The definition has expanded to include virtual machines without direct correspondence to any real hardware.

Operating Systems

An operating system (OS) is a set of programs that integrate with hardware to facilitate user interaction and resource utilization. Key objectives include:

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Android Features, Architecture, and Components

Posted by on Feb 8, 2025 in Computers | 0 comments

Unit 1

Q.1. What are the Different Features of Android?

Android, a popular mobile operating system, offers a wide range of features. Firstly, it provides a customizable home screen, allowing users to personalize their devices with widgets, app shortcuts, and wallpapers. Android supports multitasking, enabling users to switch between applications effortlessly. It also includes a diverse app ecosystem through Google Play, providing access to millions of apps, games, and utilities. Android emphasizes

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Distributed Object Computing Technologies: DCOM, CORBA, Java EE, and .NET

Posted by on Feb 7, 2025 in Computers | 0 comments

DCOM

Runs on Object Remote Procedure Call (ORPC) protocol.

The Service Control Manager (SCM) locates object implementations based on Universally Unique Identifier (UUID) and Class ID (CLSID).

Client-side stub: Proxy.

Server-side stub: Stub.

CORBA

Relies on Internet Inter-ORB Protocol (IIOP).

Object Request Broker (ORB) and Dynamic Skeleton Interface (DSI) handle object location and client invocation.

Client-side stub: Proxy or stub.

Server-side stub: Skeleton.

Java EE

Developed by Oracle (formerly Sun Microsystems)

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Conceptual Database Design: Structure & Advantages

Posted by on Feb 7, 2025 in Computers | 0 comments

Conceptual Design of Databases

Software

It is the database management system, in charge of managing the databases.

Data

It includes the need to store data and metadata, which describe what is stored in the database.

Users

People who manipulate system data. There are three categories:

  • End Users: Those who use data from the database for daily work that need not have to do with computers. Normally, they do not use the database directly, but use applications built for them to facilitate handling of the data.
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Understanding Internet and Web Services

Posted by on Feb 7, 2025 in Computers | 0 comments

Internet Services

The Internet offers numerous services, although in practice, we often use only one or two. Different types of Internet services arise depending on how information is accessed.

Key Internet Services

  • World Wide Web (WWW): A primary service for accessing information.
  • Email: Electronic mail for communication.
  • Telnet: Remote connection to other computers.
  • File Transfer Protocol (FTP): For transferring files.
  • News: News servers for disseminating information.
  • Forums and Chats: Enable conversations
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Computer Networking Fundamentals and History

Posted by on Feb 7, 2025 in Computers | 0 comments

Key Networking Concepts: Q&A

Q1. The presentation layer is responsible for translation, compression, and encryption of data.

Q2. The physical layer converts bits into electronic signals for outgoing messages.

Q3. The difference between the maximum and minimum signal heights is called amplitude.

Q4. The difference between the highest and lowest frequencies of the constituent parts of an analog signal is called bandwidth.

Q5. If a system that operates at 1000 baud has four signal levels, then the system

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