COMPUTER NETWORS
HAIDER ABBAS AFRIDI
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An overview of computer networks, covering their importance, types, and network topologies. It explains the fundamental concepts of computer networks, including resource sharing, communication, and data management. The document details various network types such as lan, wan, man, and pan, along with different network topologies like bus, star, ring, mesh, and tree topologies. Each topology's advantages and disadvantages are discussed, offering insights into choosing the right topology based on cost, scalability, fault tolerance, and complexity. Useful for students and professionals seeking to understand the basics of computer networking and network design, providing a solid foundation for further study in network technologies and communication systems.
Typology: Cheat Sheet
2024/2025
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COMPUTER NETWORS
HAIDER ABBAS AFRIDI
CONTENTS
WHAT IS COMPUTER NETWORKS
IMPORTANCE OF COMPUTER NETWORKS
TYPES OF COMPUTER NETWORKS
WHAT IS NETWOR TOPOLOGY
TYPES OF NETWORK TOPOLOGY
IMPORTANCE OF NETWORK
- (^) Resource Sharing : Networks allow sharing of files, printers, and software across systems.
- (^) Communication : Email, video conferencing, and instant messaging rely on networks.
- (^) Data Management : Centralized data storage and access improves efficiency.
- (^) Scalability : Networks can be scaled to include more devices as needs grow.
- (^) Cost Efficiency : Shared resources reduce the need for individual hardware and software.
TYPES OF NETWORK
- (^) LAN (Local Area Network) : Covers a small area such as a home, office, or campus. Example: Office network.
- (^) WAN (Wide Area Network) : Spans large geographic areas. Example: The Internet.
- (^) MAN (Metropolitan Area Network) : Covers a city or large campus. Example: Citywide Wi-Fi.
- (^) PAN (Personal Area Network) : Very short range, typically used for personal devices. Example: Bluetooth network.
TYPES OF NETWORK TOPOLOGY
Bus Topology
- (^) All devices are connected to a single central cable (the bus).
- (^) Data travels in both directions. Advantages : Easy to implement, cost-effective. Disadvantages : Difficult to troubleshoot, limited cable length, single point of failure.
TYPES OF NETWORK TOPOLOGY
Star Topology
- (^) All devices are connected to a central hub or switch.
- (^) Data passes through the central device. Advantages : Easy to manage and expand, failure in one cable doesn’t affect others. Disadvantages : If the hub fails, the entire network goes down.
TYPES OF NETWORK TOPOLOGY
Mesh Topology
- (^) Every device is connected to every other device. Advantages : High fault tolerance, reliable communication. Disadvantages : High cost, complex installation
TYPES OF NETWORK TOPOLOGY
Tree Topology
- (^) A hybrid of star and bus topologies.
- (^) Devices are arranged in a hierarchical manner. Advantages : Scalable and easy to manage. Disadvantages : Complex structure, if backbone fails, entire segment fails.