Introduction to Computer Networks and topologies.pptx
- 2. What is a Network? A collection of computers, servers, and devices connected to share data and resources. - Example: The Internet connects millions worldwide. - Connection Methods: • Cables • Telephone lines • Radio waves • Satellites
- 3. Uses of Computer Networks - Facilitate communication (e.g., email, video conferencing). - Share hardware (e.g., printers, scanners). - Share files and software. - Maintain and access information efficiently.
- 4. Types of Networks 1. Local Area Network (LAN): - Covers a small area (e.g., home, school). - Devices connected by cables or wirelessly. 2. Wide Area Network (WAN): - Covers large geographic areas. - Connected via the Internet or telecom services. - Example: The Internet.
- 5. Transmission Media - Wired Transmission: • Fiber optic cables, telephone lines. - Wireless Transmission: • Infrared, radio waves, microwaves.
- 6. Network Devices - Router: Directs data between networks. - Hub: Connects devices, broadcasts data to all ports. - Switch: Manages traffic efficiently, smarter than a hub. - NIC: Enables wired or wireless network connections. - Modem: Converts analog to digital signals for Internet access.
- 7. Key Networking Terminologies - Bandwidth: Maximum data transfer rate (e.g., 1,000 Mbps). - Ethernet: Standard for connecting devices in a LAN. - Client: A device that accesses services or data from a server. - Server: Provides resources and services to clients.
- 8. Workstations vs. Servers - Workstations: • Used directly by users. • Can be part of a network or standalone. - Servers: • Provide continuous services. • Examples: Web servers, file servers, mail servers.
- 9. Recap and Questions - Recap: • Definition and uses of networks. • Types of networks (LAN and WAN). • Transmission media and network devices. • Key terminologies and their roles. - Questions: • What is the difference between LAN and WAN? • Why is a switch preferred over a hub?