✅ Definition and Types of Networks (LAN, WAN, Wi-Fi)

A network is a system that connects multiple devices to share resources, communicate, and exchange data.

📌 Types of Networks:

🔹 Local Area Network (LAN):

• Covers a small geographical area (e.g., homes, offices, schools).

• Uses Ethernet cables or Wi-Fi for connectivity.

• Example: Office network connecting multiple computers and printers.

🔹 Wide Area Network (WAN):

• Spans large areas, such as cities or countries.

• Uses fiber optics, satellite links, or leased telephone lines.

• Example: The Internet is the largest WAN.

🔹 Wireless Networks (Wi-Fi):

• Allows devices to connect without physical cables.

• Uses radio waves to transmit data.

• Common in homes, cafes, and public spaces.

Each type of network serves different purposes, from local connections to global communication! 🌍

✅ Basic Internet Protocols (TCP/IP, HTTP, DNS)

Internet protocols define how data is transmitted and received across networks.

🔹 Transmission Control Protocol/Internet Protocol (TCP/IP):

• The foundation of internet communication.

• TCP: Ensures reliable data transmission.

• IP: Routes data packets to the correct destination.

🔹 Hypertext Transfer Protocol (HTTP/HTTPS):

• HTTP: Transfers web pages between browsers and servers.

• HTTPS: A secure version of HTTP using encryption (SSL/TLS).

🔹 Domain Name System (DNS):

• Translates domain names (e.g., google.com) into IP addresses.

• Ensures users can access websites without remembering numerical IPs.

These protocols enable seamless browsing, secure transactions, and efficient communication! 🌐

✅ Cybersecurity and Data Protection (Encryption, Firewalls)

Cybersecurity safeguards networks, devices, and data from cyber threats.

🔹 Common Cyber Threats:
✔️ Malware: Viruses, ransomware, and spyware that harm devices.
✔️ Phishing: Fraudulent emails or messages tricking users into revealing sensitive information.
✔️ DDoS Attacks: Overloading a network to make services unavailable.

🔹 Key Security Measures:
✅ Encryption: Converts data into unreadable code to protect it during transmission.
✅ Firewalls: Monitor and control incoming/outgoing traffic to block unauthorized access.
✅ Strong Passwords: Use complex, unique passwords and multi-factor authentication (MFA).

Understanding and applying cybersecurity principles ensures data privacy and system integrity! 🔒🚀