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.)

Documents

01 Introduction With Revision