Questions
2 questions per paper
Difficulty
Easy
Importance
High yield for TGT/PGT Computer Science sections
Overview
Computer Networks & Internet covers the foundational architecture of data communication and the global infrastructure of the World Wide Web. For exams like KVS, NVS, and DSSSB, it is essential to distinguish between physical connectivity layouts and logical communication rules. Mastering this topic ensures you secure marks on technical terminologies that frequently appear in the Computer Literacy sections.
Network Topologies
Network topology defines the physical or logical arrangement of nodes and connections in a network. Examiners often test the pros and cons of these layouts in terms of reliability and data flow efficiency.
- Bus Topology: Uses a single central cable (backbone) to connect all nodes.
- Star Topology: All nodes connect to a central hub or switch; failure of one node does not affect others.
- Ring Topology: Each device is connected to exactly two others, forming a circular data path.
- Mesh Topology: Every device is connected to many or all other devices for high redundancy.
- Tree Topology: A hierarchical structure with a root node and multiple branch nodes.
Communication Protocols
Protocols are the formal rules that govern how data is transmitted between devices. Understanding the standard suite (OSI and TCP/IP) is critical for identifying the functions of various layers.
- HTTP/HTTPS: Used for transferring web pages over the internet.
- FTP: Protocol dedicated to transferring files between client and server.
- SMTP: Standard protocol for sending email.
- TCP: Connection-oriented, ensures reliable delivery of data packets.
- IP: Addresses packets and handles routing across different networks.
Internet & Web Technologies
This subtopic focuses on the infrastructure of the web, including how URLs work and the difference between intranets and the public internet. It tests your knowledge of common terminology used in browsing and security.
- URL structure: Protocol + Domain Name + Path (e.g., https://www.example.com).
- DNS: Maps domain names (alphabets) to IP addresses (numbers).
- Intranet: A private network accessible only to an organization's staff.
- HTML: The markup language used to structure content on the web.
- Browser: An application that renders web resources fetched by HTTP.
Exam Tip
Focus on memorizing the functions of specific layers in the OSI model, as questions usually ask which protocol or device (like a router or hub) operates at which layer.
Common Mistakes
- Confusing TCP (connection-oriented) with UDP (connectionless).
- Misidentifying the OSI model layer functions, specifically mixing up the Data Link and Network layers.
- Assuming all network topologies have equal fault tolerance; failing to distinguish between centralized and distributed control.
More Revision Notes
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