01 Introduction With Revision
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Amity School of Engineering
B.Tech., CS(6th Sem.)
Advanced Networking
Topic: INTRODUCTION WITH REVISION
ANIL SAROLIYA
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What is Data Communication?
Data communication is defined as a subset of telecommunication involvingthe transmission of data to and from computers and components of
computer systems.
Data communication is transmitted via mediums such as wires, coaxial
cables, fiber optics, or radiated electromagnetic waves such as broadcast
radio, infrared light, microwaves, and satellites.
Following figure shows the basic elements of communication system:
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Data Transmission Modes
Unidirectional (only from one side)
Bidirectional (at a time from one side)
Bidirectional (at a time from both side)
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Computer Networks: Definition
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Network means, by any waywhen the devices are justphysically connected to each
other.
Computer network connectstwo or more autonomouscomputers.
The computers can begeographically locatedanywhere.
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Types of Networks: LAN, MAN & WAN
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Network in small geographical Area (Room, Building or aCampus) is called LAN (Local Area Network)
Network in a City is call MAN (Metropolitan Area Network)
Network spread geographically (Country or across Globe) iscalled WAN (Wide Area Network)
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Use of Networks
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Resource Sharing
Hardware (computing resources, disks, printers)
Software (application software)
Information SharingEasy accessibility from anywhere (files, databases)
Search Capability (WWW)
Communication
EmailMessage broadcast
Remote computing
Distributed processing (GRID Computing)
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The network topology defines the way in which computers, printers, and
other devices are connected.
A network topology describes the layout of the wire and devices as wellas the paths used by data transmissions.
Network Topology
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A frame travels around the ring, stopping at each node. If a node wants to
transmit data, it adds the data as well as the destination address to theframe.
The frame then continues around the ring until it finds the destination node,which takes the data out of the frame.
Single ring All the devices on the network share a single cable
Dual ring
The dual ring topology allows data to be sent in both directions.
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Ring Topology
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Network Components
Physical Media
Interconnecting Devices
ComputersNetworking Software
Applications
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Networking Media
Networking media can bedefined simply as themeans by which signals(data) are sent from onecomputer to another(either by cable or wirelessmeans).
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Networking Devices
HUB, Switches, Routers, WirelessAccess Points, Modems etc.
Such devices are also termed asintermediate devices.
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Computers: Clients and Servers
In a client/server networkarrangement, networkservices are located in adedicated computer whose
only function is to respondto the requests of clients.
The server contains thefile, print, application,
security, and other servicesin a central computer thatis continuously available torespond to client requests.
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Networking Protocol in layer structure of TCP/IP
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Applications
E-mail
Searchable Data (Web Sites)
E-Commerce
News GroupsInternet Telephony (VoIP)
Video Conferencing
Chat Groups
Instant Messengers
Internet Radio
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Networking related Important Terms (Student Exercise)
Internet, Intranet & Extranet Encryption/Decryption
ISP Connection Oriented v/s Connection Less
Protocol IP Address
Network Services Routing
Port & Socket Buffering in Intermediate Devices
Gateway MAC Address
Bandwidth Switching: Circuit & Packet
Traffic Control: Flow & CongestionMultiplexing PDU: Segment, Packet, Frame
Layers of OSI Reff. & TCP/IP Model Hub v/s Switch
Encapsulation/De-capsulation Switch v/s Router
Encoding/Decoding Bridge v/s Router
Compression/Decompression Unicast, Multicast, Broadcast
Note: Above terms (covered in previous semester DCCN subject) are prerequisite to cover the
syllabus of Advanced Networking.
Student are advised to prepare 2-3 line note on each term and submit it to concernfaculty member.
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Thanks
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Amity School of Engineering
B.Tech., CS(6th Sem.)