CertBros Lecture: Introduction to Computer Networks

Definition of a Computer Network

• Network: A group/system of interconnected people or things.
• Computer Network: A system where more than one computer is interconnected.
  • Traditionally includes desktop computers, servers, printers.
  • Modern networks also include smart devices (mobile phones, tablets, security cameras, smart lights).

Basic Network Components

• Switch: Connects devices within the same network.
• Router: Connects networks to each other.
• Wireless Access Point: Allows wireless devices to connect to the network.
• Devices: Desktop computers, mobile phones, etc.

Types of Networks

Local Area Network (LAN)

• Network in a single area.
• Connects to the outside world via a wall socket installed by an Internet Service Provider (ISP).

Wide Area Network (WAN)

• Connects separate LANs together.
• Example: The Internet.
• Businesses may have private WANs for connecting multiple sites.

Business Network Example

• Office Computers: Plug into wall/floor sockets.
• Wiring Closet: Centralized room for network connections, also known as patch or server room.
• Switches: Devices in the wiring closet mounted onto racks.
• Multiple Wiring Closets: May exist in larger buildings and connect via floor or ceiling cables.

Mobile Networks

• Smartphones: Connect to the internet via 3G, 4G, 5G.
• Cell Towers: Provide wireless network access; proximity affects connection quality.

Importance of Networks

• Resource Sharing: Share resources like printers and files.
• Communication: Enables email, messaging, and internet searches.
• Internet: Global network offering a wealth of information and services (e.g., email, VoIP, YouTube).

Conclusion

• Networking has revolutionized global connectivity and resource sharing.
• Continuous learning in networking is essential, as it evolves.
• Further detailed exploration in the full CCNA course.

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