NT&EC Session 1 d.punia
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Transcript of NT&EC Session 1 d.punia
8/8/2019 NT&EC Session 1 d.punia
http://slidepdf.com/reader/full/ntec-session-1-dpunia 1/22
Networking Technologiesand E-Commerce
Dr. Devendra Kumar Punia
[email protected]://www.linkedin.com/in/devendrakpunia/
8/8/2019 NT&EC Session 1 d.punia
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Course outline
Objectives
Introduce ma jor concepts of data communication,networking, LAN, WAN, Wireless LAN, Mobilecomputing, Internet, Intranet
Explain functioning of WWW, underlying
infrastructure and technology Introduce Electronic Commerce with enabling
infrastructure, payment systems, security, socialand legal issues
Text Book E-commerce business, Technology, Society,
Kenneth C Laudon & Carol Guercio Traver, Pearsoneducation, India Reprint 2003
8/8/2019 NT&EC Session 1 d.punia
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Assessment
Total marks 100
Quiz and Assignments 5
Case studies, class participation, 15
presentation
Mid Term Exam 20
Pro ject Presentation 20
End Term Exam 40
8/8/2019 NT&EC Session 1 d.punia
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Telecommunication
Transfer of meaningful information from sender to receiverover cable or wireless media
Includes all of the hardware and software necessary for itstransmission and reception
Telephony
Limited to transmission of sound over wire or wireless Assumes temporarily dedicated point-to-point connection
rather than broadcast connection
Telegraphy Limited to transmission of dash (long beep) and dot (short
beep) over wire or wireless
Distinction between Telecom and Telephony Difficult to distinguish because of the use of digital
techniques (binary bits) for transmitting any form of information (audio, video or data)
W hat is telecommunication?
8/8/2019 NT&EC Session 1 d.punia
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History of telecom: an overview 1837: Samuel Morse invents the telegraph
1858: Transoceanic telegraph cable is laid 1876: Alexander Graham Bell invents the telephone
1885: Incorporation of AT&T
1888: Hertz discovers the electromagnetic wave
1895: Marconi begins experimenting with wireless telegraph
1906: First radio built
1920: First commercial radio broadcast
1969: ARPANET was funded by the DARPA
1978: Unix-to-Unix copy program
1981: Development of CSNET and BITNET 1982: Term Internet is coined
1986: Establishment of NSFNET
1989: CSNET and BITNET merge to form CREN
1990: WWW becomes part of the Internet
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Communication System Model«
8/8/2019 NT&EC Session 1 d.punia
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Communication System Model
8/8/2019 NT&EC Session 1 d.punia
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Classification by Spatial Distance
LAN (Local Area Network) Less than 5 km, private, Mbps to Gbps
MAN (Metropolitan Area Network)
5 to 50 km, private/public, kbps to Mbps
WAN (Wide Area Network)
More than 50 km, private/public, kbps to Mbps
Classification of data networks«
8/8/2019 NT&EC Session 1 d.punia
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Classification by Topology
Ring
Bus
Star
Tree
Mesh
Hybrid
Classification of data networks«
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By Switching Technology
Circuit Switching Connection-oriented networks, ideal for real-time applications,
guaranteed quality of service
Message Switching Store-and-forward system
Packet Switching Shared facilities, Used for data communications
Cell Switching Fast processing of fixed length cells
Classification of data networks«
8/8/2019 NT&EC Session 1 d.punia
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Type of Inf ormation
Data Communications Digital transmission of information
Voice Communications
Telephone communications
Video Communications
Cable TV or video conferencing
Classification of data networks«
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By Computing Model
Distributed Computing Client/Server set-up
Centralized Computing
Thin-client architecture
Classification of data networks«
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By Ownership
Public Network Owned by a common carrier
Private Network
Built for exclusive use by a single organization
Virtual Private Network
Encrypted tunnels through a shared private or publicnetwork
Classification of data networks«
8/8/2019 NT&EC Session 1 d.punia
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Standards
Importance
Provide a ³fixed´ way for hardware and/or software systems(different companies) to communicate
Help promote competition and decrease the price
Types of Standards Formal standards
Developed by an industry or government standards-makingbody
De-facto standards
Emerge in the marketplace and widely used Lack official backing by a standards-making body
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Standardization process
Specification
Developing the nomenclature and identifying the problems tobe addressed
Identification of choices
Identifying solutions to the problems and choose the ³optimum´ solution
Acceptance
Defining the solution, getting it recognized by industry so
that a uniform solution is accepted
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Major standards bodies ISO (International Organization for Standardization)
Technical recommendations for data communication interfaces Composed of each country¶s national standards orgs.
Based in Geneva, Switzerland (www.iso.ch)
ITU-T (International Telecommunications Union ±Telecom Group Technical recommendations about telephone, telegraph and data
communications interfaces
Composed of representatives from each country in UN Based in Geneva, Switzerland (www.itu.int)
ANSI (American National Standards Institute) Coordinating organization for US (not a standards- making body)
(www.ansi.org)
IEEE (Institute of Electrical and Electronic Engineers) Professional society; also develops mostly LAN standards,
http://standards.ieee.org
IETF (Internet Engineering Task Force) Develops Internet standards
No official membership (anyone welcome) (www.ietf.org)
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Emerging trends in networking
Pervasive Networking
Integration of Voice, Video and Data
New Information Services
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Pervasive networking
Means ³Networks will be everywhere´
Exponential growth of network use
Many new types of devices will have networkcapability
Exponential growth of data rates for all kinds of
networking Broadband communications
Use circuits with 256 Kbps or higher (e.g., DSL)
8/8/2019 NT&EC Session 1 d.punia
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Also called ³Convergence´
Networks that were previously transmitted using separatenetworks will merge into a single, high speed, multimedianetwork in the near future
First step largely complete
Integration of voice and data
Next step Video merging with voice and data
Will take longer partly due to the high data rates required for
video
Integration of voice, video & data
8/8/2019 NT&EC Session 1 d.punia
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New information services
World Wide Web based
Many new types of information services becoming available Services that help ensure quality of information received over
www
Application Service Providers (ASPs)
Develop specific systems for companies such as providing
and operating a payroll system for a company that does nothave one of its own
Information Utilities (Future of ASPs)
Providing a wide range of info services (email, web, payroll,etc.) (similar to electric or water utilities)
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Implications for management
Embrace change and actively seek to use new
aspects of networks toward improving yourorganization Information moved quickly and easily anywhere and anytime
Information accessed by customers and competitors globally
Use a set of industry standard technologies Can easily mix and match equipment from different vendors
Easier to migrate from older technologies to newertechnologies
Smaller cost by using a few well known standards
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Thanks