Introduction-Data Communication-Lecture Slides, Slides of Data Communication Systems and Computer Networks

Download Introduction-Data Communication-Lecture Slides and more Slides Data Communication Systems and Computer Networks in PDF only on Docsity!

Data Communication

Lecture- BS(CIS) Semester-IV

About Course

• About Course contents and detailed lecture plan
• Course book  “Data and Computer Communications” by William Stallings (7th Edition)
• Reference Books  “Computer Networks” by Andrew S.Tanenbaum  “Data Communication and Networking” by Behrouz A Forouzan
• Laboratory work  Mathematical implementation and solution of problems using Matlab  Implementation of simple protocols using C/C++ or higher languages  During semester Projects may be offered

Data Communication

• Why study data communication

 Understanding of basic communication principles, devices, data encoding techniques, communication models  Data communication focuses on reliable transmission of data between two devices

• Data communication and Networking

 Networking focuses on the interaction way different communication networks are joined together and to make a broader set of services

A simple communication model

Communication Tasks for Simple Communication Model

 Transmission System Utilization  Interfacing  Signal Generation  Synchronization  Exchange Management  Error detection and correction

 Addressing and routing  Recovery  Message formatting  Security  Network Management

• Other than connecting the devices physically what other task should necessarily be performed?

Data communication perspective for Simple

Communication Model

Communication Networks

• Major categories of communication network

 Wide Area Network (WAN)  Local Area Network (LAN)

• Wide Area Network

 Covers large geographical area  Consists of interconnected switching nodes  Data travels from node to node  Internet is wide area network  Major technologies are Circuit switching and Packet Switching

WAN Technologies

• Circuit Switching

 A dedicated physical connection is established for the duration of communication  All the data is transferred through this path  Connection discarded after communication  A new connection is established for next transmission  Reliable and high speed technology  Also called connection oriented technology

• Example

 Public telephone system.

WAN Technologies

• Packet Switching

 Message is divided into small chunks of data called packets  Packet are transmitted individually  Packets may have different paths and arrival time  Accompanied by loss of data and time delay  Also called connection less technology  Can be made connection oriented using high level protocol

• Example

 Internet

Local Area Networks

• LAN Characteristics

 Covers small area

• Building or small campus  Usually owned by same organization as attached devices  Data rates much higher  Usually broadcast systems  Used for sharing resources

Example

 Network in the Computer Center

• LANs broadly falls in two categories

 Switched LANs  Wireless LANs

LANs

• Switched LANs

 Built around a central device termed as “switch”, the nodes are connected to the switch  The switch in one LANs can be connected to another switch to form a larger LANs

• Wireless LANs

 A local area network based on wireless technology  An emerging branch of network  Provides mobility and ease of deployment

Metropolitan Area Networks

• A metropolitan wide network

• What is the difference between LAN MAN and

WAN?

 Geographical are occupied  Wan offers low data rates as compared to LAN  MAN provides higher data rates in a large area but only for metropolitan areas  A MAN can be said as an extension of LAN

References for lecture-

• Course book chapter-

• Lecture slides at

dataserver\learningmaterials\nauman

shamim\datacommunication