Computer_Networks_Lecture.pdf

Lecture on Computer Networks Introduction to Computer Networks A computer network is a collection of interconnected devices (computers, servers, printers, etc.) that communicate with each other to share resources, such as data, applications, or hardware like printers. The primary goal is to enabl...

Lecture on Computer Networks Introduction to Computer Networks A computer network is a collection of interconnected devices (computers, servers, printers, etc.) that communicate with each other to share resources, such as data, applications, or hardware like printers. The primary goal is to enable resource sharing and ensure communication among devices. Meaning of Computer Networks A computer network is a system of interconnected devices that communicate over a communication medium (e.g., wired cables, wireless signals) to exchange data and share resources. Components: - Devices (Nodes): Computers, smartphones, servers, etc. - Communication Medium: Ethernet cables, Wi-Fi, fiber optics, etc. - Protocols: Set of rules for communication (e.g., TCP/IP). Scope of Computer Networks 1. Resource Sharing 2. Data Communication 3. Collaboration 4. Internet Access 5. Security 6. Scalability Benefits of Computer Networks 1. Resource Sharing 2. Communication 3. Data Backup and Recovery 4. Cost-Effective 5. Scalability Types of Networks Networks can be classified based on their size, purpose, and geographical area they cover. 1. Local Area Network (LAN) Definition: A LAN is a network that connects devices within a limited area, such as a home, school, or office building. 2. Wide Area Network (WAN) Definition: A WAN connects devices over a large geographical area, often across cities, countries, or even continents. 3. Metropolitan Area Network (MAN) Definition: A MAN spans a city or a large campus and connects multiple LANs within that area. Conclusion Computer networks are fundamental to modern communication and resource sharing, enabling individuals, organizations, and governments to function more efficiently. By understanding the types and benefits of networks, students will gain valuable insights into how the digital world operates. Key Takeaways 1. Networks enable resource sharing, communication, and collaboration. 2. LANs operate within small areas, while WANs cover larger geographical regions. 3. MANs connect networks across cities, providing a middle ground between LANs and WANs. 4. Network benefits include cost efficiency, improved communication, and scalability.