Computer Science · Class 12
Computer Networks
Learn Computer Networks with notes, examples, and practice questions.
3 sections15–25 min read6 MCQs · 2 examples
Chapter Overview
Computer Networks covers how computers connect and communicate — network types, devices, protocols, and security for Class 12.
Protocols & Layers
- TCP/IP protocol suite
- HTTP, HTTPS, FTP, SMTP
- OSI model layers (overview)
- IP address and DNS
Network Hardware
- Router, switch, modem
- LAN, WAN, MAN
- Wi-Fi and Ethernet
- Firewall protects network
Solved Examples
Step-by-step solutions — read each step before checking the final answer.
LAN vs WAN
Compare LAN and WAN with examples.
- 1LAN: school lab, home Wi-Fi
- 2WAN: internet across cities/countries
- 3LAN is smaller and faster locally
Answer
LAN local; WAN wide area
IP address
What is an IP address used for?
- 1Unique identifier on network
- 2Like a house address for data delivery
- 3IPv4 example: 192.168.1.1
Answer
Identifies device on network
Key Points to Remember
- ✓ Router connects LAN to internet
- ✓ Switch connects devices in LAN
- ✓ DNS converts domain to IP
Exam Tips
- • Draw network diagram
- • Name network devices
- • Know protocol full forms
Practice MCQs — Computer Networks
Test your understanding with topic-wise multiple choice questions. Explanations appear after each answer.
Question 1 of 6Score: 0/0
LAN stands for: