TOPIC 4 - Telecommunication, Internet, Intranet and Extranet

A telecommunications system consists of fundamental components including:
- Transmitting and receiving devices
- Pathways for communication (medium)
- Signals being communicated
Enables organizations to meet personal and organizational objectives effectively.

Several types of networks exist, each with distinct uses and limitations:
- Personal Area Networks (PAN): Connect devices within 33 feet; ideal for personal devices.
- Local Area Networks (LAN): Connect devices in a small area (e.g., offices); allows high-speed communications.
- Metropolitan Area Networks (MAN): Span a city or campus; connect multiple LANs in a specific area.
- Wide Area Networks (WAN): Cover large geographic areas; suitable for connecting multiple LANs.

Organizations often require processing alternatives between multiple computer systems:
- Centralized Processing: All computing occurs in a single location.
- Decentralized Processing: Processing occurs at several remote locations.
- Distributed Processing: Remote devices are interconnected and collaborate through a network.

The Internet is a vast infrastructure for distributing and accessing information and services.
Key aspects include:
- Internet Protocol (IP): Enables routing of communication traffic.
- IP Addresses: Unique identifiers assigned to each device on the network.
- Uniform Resource Locator (URL): The address that specifies the location of resources on the Internet.

ISPs serve as intermediaries for organizations and individuals trying to access the Internet.
Typical access methods include:
- Via LAN servers connected to high-speed lines.
- Through subscription services provided by ISPs.

Originally developed as a document-management system, now serves:
- A primary source of news and information.
- A critical platform for commerce and online communication.
- A hub for social interaction and entertainment.

Web Browsers: Software for viewing and interacting with web content (e.g., Chrome, Firefox).
Search Engines: Tools like Google that help users locate information by keyword.
Web Development: Involves creating websites using technologies such as HTML, CSS, and XML.

Popular applications include:
- Communication: E-mail, instant messaging, and teleconferencing.
- Social Media: Platforms for sharing content and community engagement.
- E-Commerce: Online shopping and payment processing systems.

The Internet serves various sectors:
- News and Opinion: Provides updates and information on global events.
- Education and Training: Offers resources for both formal education and self-directed learning.
- Health Advice: Websites provide guidance and diagnostic information for users.

Intranet: A private network that uses Internet protocols to securely share information within an organization.
Extranet: A controlled private network that allows external partners to access specific resources of an organization's intranet.
Differences in access requirements:
- Intranet: Users need a valid ID and password.
- Extranet: Access is typically granted to business partners and requires authentication.

Telecommunications: Involves electronic transmission of data across various media (telephone, radio, TV).
Internet: A global network facilitating information access; contains millions of interconnected servers.
Cloud Computing: Provides internet-based services including software and data storage, accessible from anywhere.
Web 2.0: Refers to a platform for user interaction, content sharing, and collaborative applications on the web.