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📘 Information Technology (IT) – Exam/Training Notes
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✅ 1. Computer Basics
Hardware: Physical components (CPU, RAM, HDD, Monitor, Keyboard, Mouse).
Software: Programs and operating systems (Windows, Linux, macOS).
Input Devices: Keyboard, mouse, scanner.
Output Devices: Monitor, printer, speakers.
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✅ 2. Operating Systems (OS)
Functions:
Manage hardware resources
Provide user interface
File management
Security control
Types:
GUI (e.g., Windows)
CLI (e.g., Linux terminal)
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✅ 3. Networking Fundamentals
, LAN – Local Area Network (small area)
WAN – Wide Area Network (global, e.g., Internet)
IP Addressing – IPv4 and IPv6
Network Devices:
Router – Connects networks
Switch – Connects devices in a LAN
Modem – Connects to ISP
Protocols:
TCP/IP – Core protocol suite
HTTP/HTTPS – Web browsing
FTP – File transfer
DNS – Resolves domain names
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✅ 4. Cybersecurity Basics
Threats:
Malware (viruses, worms, ransomware)
Phishing
DoS attacks
Protection:
Firewalls
Antivirus software
Strong passwords