Computer Network

Computer Tutorial

Introduction to Networking Elementary Terminology of Networks History (Development) of Computer Networks Advantages of Computer Networks Disadvantages of Computer Networks Applications & Uses of Networks ARPANET Internet

» Data Communication » Data Communication Component » Data Transmission Modes » Types of Connections » Analog Transmission » Digital Transmission

Transmission Media Twisted Pair Cable Coaxial Cable Optical Fiber Wireless Communication Radio waves Microwave Infrared

Types of Computer Networks Personal Area Network Local area networks Metropolitan Area Network Wide Area Network Type of Network on the term purpose

Computer Network topologies Bus Topology Ring Topology Star Topology Mesh Topology Tree Topology Hybrid Topology

Networking Devices Hubs Switches Bridges Routers Gateways Wireless Access Point Modems Media Converters Firewalls

Wireless or Mobile Computing Evolution of mobile communication systems Second Generation Networks Third Generation Networks Fourth & Fifth Generation Networks Wireless Transmission Protocols Multiple Access Techniques Frequency Division Multiple Access Time Division Multiple Access Code Division Multiple Access Space Division Multiple Access

Computer Network Model Layered Tasks The OSI Model Physical Layer Data Link Layer Network Layer Transport Layer Session Layer Presentation Layer Application Layer TCP/IP Reference Model

Medium Access Methods ALOHA Slotted ALOHA CSMA CSMA / CD Collision-Free Protocols

Error Detection and Correction Types of errors Error Detecting Codes Simple Parity check Two-dimension Parity Check Checksum Cyclic redundancy check Error Correcting Codes

Network Security Network Security Threats Network Security Threats Prevention Why Three Encryption Techniques? Firewall

Computer Networ MCQ

Data Communication Component

The transmitter sends the message and the receiver receives the message. The medium is the channel over which the message is sent and the protocol is the set of rules that guides how the data is transmitted from encoding to decoding. The message of course is central to all the components. The message is the data that is being communicated.
The following are the basic components for working of a communication system :
1. Transmitter
2. Receiver
3. Medium
4. Message
5. Protocol

Transmitter

The transmitter is the device that sends the message. It can be a computer, workstation, telephone handset, video camera, and so on.

Receiver

The receiver is the device that receives the message. It can be a computer, workstation, telephone handset, television, and so on.

Medium

The transmission medium is the physical path by which a message travels from sender to receiver. It can consist of twisted pair wire, coaxial cable, fiber-optic cable, laser or radio waves (terrestrial or satellite microwave).

Message

The message is the transmission (data) to be communicated. It can consist of text, number, pictures, sound, or video or any combination of these.

Protocol

A protocol is a set of rules that governs data communication. It represents an agreement between the communicating devices. Without a protocol, two devices may be connected but not communicating, just as a person speaking German cannot be understood by a person who speaks only Japanese.

Computer Network

Data Communication Component