NETWORK (Computer Network)

NETWORK (Computer Network)

A computer network is a group of devices (computers, servers, routers, switches, printers, IoT devices) that are connected together to share data and resources.

🔹 Why Networks Are Important

• Communication (email, messaging, video calls)
• Resource sharing (files, printers, internet)
• Centralized management
• Security and access control
• Cloud & internet access

🔹 Types of Networks

1️⃣ PAN – Personal Area Network

• Very small range (Bluetooth, hotspot)

2️⃣ LAN – Local Area Network

• Home, school, office
• High speed, low latency

3️⃣ MAN – Metropolitan Area Network

• City-wide networks

4️⃣ WAN – Wide Area Network

• Large geographic areas
• Example: The Internet

🔹 Network Devices (Must-Know)

• Router – Connects different networks
• Switch – Connects devices in a LAN
• Hub – Basic device (rarely used now)
• Firewall – Network security
• Access Point – Wireless connectivity