Networking and Internet

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 Networking and Internet

1. Introduction to Computer Network
2.Transmission Media
3. Network Devices
4. Network Protocols
5. Internet Concepts
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What is Computer Network
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When two or more computer are connected logically with the help of data communication devices and transmission media. it is called computer Network. 

Computer network is a collection of interconnected devices that communicate with each other to exchange data and resources

Need of networking :

  1. Resource Sharing: Networks allow multiple users to share hardware (printers, scanners) and software, reducing costs and improving efficiency.
  2. Data Sharing and Management: Users can share files and access centralized data, which simplifies backups and ensures data consistency.
  3. Improved Communication: Networking provides tools for fast, real-time communication, including instant messaging, email, and video conferencing.
  4. Remote Access: It enables users to connect to systems and access files from anywhere, facilitating remote work.
  5. Increased Storage Capacity: Networks allow users to access shared storage capacity, overcoming the limits of a single machine's storage.
  6. High Reliability: Data can be backed up on multiple machines, ensuring that if one fails, the data remains accessible.
  7. Lower Costs: By sharing resources and using centralized systems, organizations save money on hardware and software procurement
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What are the types of Computer Networks
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1. Personal Area Network (PAN)
This connects personal devices within a very short range around a single user.


Coverage Range: 1–10 meters
Key Technologies: Bluetooth, NFC, Infrared
Real-World Example: Smartphone connected to wireless earbuds
When It Is Used: For short-range communication between personal devices

2. Local Area Network (LAN)
This connects computers and devices within a limited area such as a home, office, or building.


Coverage Range: One room, building, or small campus
Key Technologies: Ethernet, Wi-Fi
Real-World Example: Home or office Wi-Fi network
When It Is Used: For fast and secure communication within a local location

3. Campus Area Network (CAN)
A CAN connects multiple LANs within a campus or a group of nearby buildings.
Campus area networks operate by interconnecting multiple buildings or departments through a high-speed backbone network that carries traffic between distributed LANs.


Coverage Range: University or corporate campus
Key Technologies: Ethernet, Fiber Optics
Real-World Example: College or corporate campus network
Use Cases: Ideal for university campuses, corporate offices, or hospitals, allowing efficient sharing of resources, applications, and internet access across departments.
Key Benefits: It is cost-effective, easily scalable to add new buildings or devices, and offers enhanced security by filtering traffic through a central point.

Examples of Campus Area Networks in Use

  • University and Educational Campuses
  • Corporate Campuses and Office Parks
  • Industrial Complexes
  • Healthcare Campuses
  • Government or Military Bases
  • Large Venues and Distributed Sites

4. Metropolitan Area Network (MAN) 
A MAN connects multiple networks within a city or metropolitan region.
It is commonly used in computer networks to provide high-speed data communication across institutions, offices, and campuses, making it essential for students, IT professionals, and anyone interested in networking fundamentals. In this article, we will explore the meaning, significance, and practical applications of MAN in the context of modern digital communication.



Coverage Range: City or large town(5–50 km).
Key Technologies: Fiber Optics, Microwave, Metro Ethernet
Real-World Example: City-wide ISP network
When It Is Used: To provide high-speed connectivity across a city
Speed: Provides high-speed connectivity (typically in Mbps/Gbps), faster than typical WAN speeds.
Ownership: Usually maintained by a single entity, such as a consortium of users or a large network provider.
Examples: Cable television networks, city-wide internet service providers (ISPs), and campus-area networks (CAN). 
Advantages:
  • High data transmission rates.
  • Ideal for connecting multiple branches within a city.
  • Centralized management and high security. 

Disadvantages:
  • Expensive to install and maintain.
  • Difficult to maintain or troubleshoot compared to LANs.
  • Can experience congestion with high traffic.

5. Wide Area Network (WAN)
A WAN connects networks over large geographical areas such as countries or continents.


It is called a wide-area network because it spans beyond a single building or large campus to include multiple locations spread across a specific geographic area, or even the world. For example, businesses with many international branch offices use a WAN to connect office networks together. The world’s largest WAN is the internet because it is a collection of many international networks that connect to each other. This article focuses on enterprise WANs and their uses and benefits.



Coverage Range: Country, continent, or global
Key Technologies: Leased lines, Satellite links, Internet, VPN
Real-World Example: The Internet
When It Is Used: To enable long-distance and global communication
Advantages: Enables centralized management, high-speed communication between distant locations, and shared resources.
Disadvantages: Often entails high setup/maintenance costs, slower speeds than LANs, and increased security risks due to dispersed infrastructure. 
Example: A corporation with a head office in London and branch offices in New York and Tokyo, all connected via a secure, private network to share data seamlessly.

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Network toplogy: BUS Ring, Star Mesh Tree


Transmission Media: GUIDED mEDIA, unguide media, Twisted Pair Cable, Coaxial Cable Optical Fiber

Unguided Media: Infrared, micro wave Transmission Radio Wave Bkutooth SIFI

Netwotk Devices   Modem (Internal  External: DSL, Cable Modem, Satellite Modem )
HUB, Switch , NIC, Bridge, Repeaters, Routers, Gateways RJ45


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