Computer Networks

Computer Networks

1. Server/Client

   • Server
   • Client

2. Types of Networks and Coverage

   • LAN
     • Local area networks cover a small physical area.
   • WLAN
     • Wireless local area networks enable users to move around within a larger coverage area, but still be wirelessly connected to a network.
   • WAN
     • Wide area networks cover a broad area.
   • MAN
     • Metropolitan area networks are very large networks that cover an entire city
   • PAN
     • Personal area networks are used for communication among various devices such as telephones.
   • DNS
     • The domain name system is a hierarchical decentralized naming system for computers, services, or any resource connected to the internet or a private network.

3. History

   • Tim Berners-Lee
     • Inventor of world wide web.
       • www
         • it is an information space where documents and other web resources are identified by uniform resource locators (URLs), linked by an hypertext links, and can be accessed via internet.
   • ARPANET
     • The advanced research projects agency network was an early packet switching network and the first network to implement the protocol suite.

4. Protocols

   • IP
     • Internet Protocol
   • NCP
     • Network Control Program
   • TCP
     • Transmission control protocol
   • FTP
     • File transfer program

5. Security

   • Firewall
     • Controls incoming and outcomig network
   • Performance
     • Well of performance
   • Security
     • Policies and practices
   • HTTP
     • Hypertext transfer protocol
   • Reliability
     • If it works as expected.

6. Types of computers

   • Micro computer
   • Mini Computer
   • MAcro Computer
   • Super Computer

7. Topology

   • BUS
     • Nodes directly connected to a common linear half-duplex link.
   • RING
     • Each node connects to exactly two other nodes, forming a single pathway for signals through each node.
   • STAR
     • A central device which is used to connect multiple PCs in a local area network.
   • MESH
     • Each node relays data for the network.

8. Transmission Media

   • Radio
   • Coaxial Cable
   • Microwave
   • Twisted cable
   • Satelite
   • Optical Fiber