CHAPTER -1. Introduction to Computer Networks

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "CHAPTER -1. Introduction to Computer Networks"

Transcription

1 CHAPTER -1 Introduction to Computer Networks

2 PRELIMINARY DEFINITIONS computer network :: [Tanenbaum] a collection of autonomous computers interconnected by a single technology. communications network ::a set of equipment and facilities that provide a service. General definition : A network can consist of two or more computers directly connected by some medium such as physical or wireless medium.

3 USE OF COMPUTER NETWORKS (i) Business Applications : In business there is resource sharing of inventories, payroll etc. This can be done by computer networks, its main goal is to make all the programs, equipment and especially data available to all trough network.

4 A) USING CLIENT-SERVER APPLICATIONS

5 CLIENT-SERVER ARCHICTECTURE server: always-on host permanent IP address server farms for scaling clients: communicate with server may be periodically connected may have dynamic IP addresses do not communicate directly with each other 5

6 CLIENT SERVER MODEL :--

7 B) USING E-COMMERCE - Includes: Online business to business transactions Online business to consumer transactions Digital delivery of products and services Online merchandising(trading). Automated telephone transactions example phone banking etc.

8

9 (II) HOME APPLICATIONS : These applications are used by the people for their personal use. a) Access to remote information :- This application can be obtained by surfing WWW(World Wide Web), here the information is available at a particular location the user can connect through a network and access these information. For example : online information.

10 B) PERSON-TO-PERSON APPLICATIONS Figure :- In a peer-to-peer system there are no fixed clients and servers.

11 PEER-TO-PEER APPLICATIONS In Peer-to-Peer Applications all the end system of the computer network is known as peer, these peer communicate directly with each other to form a peer communication.

12 C) INTERACTIVE ENTERTAINMENT :- There are many applications which are used for entertainment, for example :- Video on Demand VoIP (Voice over Internet Protocol) Messages services etc.

13 (III) MOBILE NETWORK USERS :- Communication through wireless systems. Many mobile computers and personal digital assistant(pda) are very popular these days. These system uses WAP 1.0 (Wireless Application Protocol). This is known as m-commerce.(mobile commerce)

14 Figure :- Combinations of wireless networks and mobile computing.

15 NETWORK CLASSIFICATION BY SIZE Figure :- Classification of interconnected processors by scale.

16 NETWORK HARDWARE There are two types of transmission technology : Broadcast links Point to Point

17 BROADCAST LINKS In broadcast network there is a single communication channel which is shared by many system onto the network. The information in the network travel in the form of packets. A packet is short message, chunk of packets combine to form a information. When a packet is transmitted or received to all the machine on the network this mode of operation is called Broadcasting.

18 P2P ARCHITECTURE no always on server arbitrary end systems directly communicate peers are intermittently connected and change IP addresses example: Gnutella large peer-to-peer network which, at the time of its creation, was the first decentralized peer-to-peer network of its kind, leading to other, later networks adopting the model. Highly scalable But difficult to manage 18

19 CLASSIFICATION OF NETWORK : LANs {Local Area Networks} Wired LANs: typically physically broadcast at the MAC layer (e.g., Ethernet, Token Ring) Wireless LANs MANs {Metropolitan Area Networks} campus networks connecting LANs logically or physically. often have a backbone (e.g., FDDI fiber distribution data transfer and ATM asynchronous transfer mode)

20 WIRED LANS transceivers Ethernet bus Ethernet hub

21 WIRELESS LANS Figure : (a) Wireless networking with a base station. (b) Ad hoc networking.

22 METROPOLITAN AREA NETWORKS Figure : A metropolitan area network based on cable TV.

23 MAN 2 a 3 c 1* 4 A b d Metropolitan network A consists of access subnetworks a, b, c, d. Subnet : is a logically visible subdivision of an IP network. Hierarchical Network Topology A a National network consists of regional subnetworks a, b, g. b g Metropolitan network A is part of regional subnetwork a. Leon-Garcia & Widjaja: Communication Networks

24 WANS {WIDE AREA NETWORKS}ALSO to as point-to-point networks. ARPANET (Advanced Research Projects Agency Network (early internet) usually hierarchical with a backbone. Enterprise Networks, Autonomous Systems (ASs) VPNs (Virtual Private Networks).

25 WIDE AREA NETWORKS (WANS) Figure : A stream of packets from sender to receiver.

26 WIRELESS NETWORKS System Interconnection Wireless LAN Wireless WAN a)system Interconnection :- means interconnection of components of computer within short range, via infra-red, bluetooth etc

27 B) WIRELESS LAN Here every system of the network contains radio modem and antenna by which it communicate with each other. (Peripheral Component Interconnect) The standard for WLAN is IEEE , due to less distance between end system & base system, the speed is very high upto 50Mbps.

28 WIRELESS LANS: IEEE IS A SET OF STANDARDS FOR IMPLEMENTING WIRELESS LOCAL AREA NETWORK (WLAN) COMPUTER COMMUNICATION IN THE 2.4, 3.6 AND 5 GHZ FREQUENCY BANDS. THEY ARE CREATED AND MAINTAINED BY THE IEEE LAN/MAN STANDARDS NETWORKS. INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS WI-FI : Wireless Fidelity Multipath fading

29 C) WIRELESS WAN

30 NETWORK SOFTWARE PROTOCOL HIERARCHIES

31 PROTOCOL HIERARCHIES Example information flow supporting virtual communication in layer 5.

32 Connection oriented : Direct path establishment between source and destination. Example : Telephone system Connection less : Indirect path establishment between source and destination. Example : Mailing service

33 CONNECTION-ORIENTED VERSUS CONNECTIONLESS SERVICE

34 SERVICE PRIMITIVES

35 THE OSI (OPEN SYSTEM INTERCONNECTION)REFERENCE MODEL Principles for the seven layers Layers created for different abstractions Each layer performs well-defined function Function of layer chosen with definition of international standard protocols in mind Minimize information flow across interfaces between boundaries Number of layers optimum

36

37 TASKS INVOLVED IN SENDING LETTER

38 LAYER 7 THE APPLICATION LAYER The top layer of the OSI model Provides a set of interfaces for sending and receiving applications to gain access to and use network services, such as: network file transfer, message handling and database query processing

39 LAYER 6 THE PRESENTATION LAYER Manages data-format information for network communications (the network s translator) For outgoing messages, it converts data into a generic format for network transmission; for incoming messages, it converts data from the generic network format to a format that the receiving application can understand This layer is also responsible for certain protocol conversions, data encryption/decryption, or data compression/decompression A special software facility called a redirector operates at this layer to determine if a request is network related on not and forward network-related requests to an appropriate network resource

40 LAYER 5 THE SESSION LAYER Enables two network resources to hold ongoing communications (called a session) across a network Applications on either end of the session are able to exhange data for the duration of the session This layer is:responsible for initiating, maintaining and terminating sessions Responsible for security and access control to session information (via session participant identification) Responsible for synchronization services, and for checkpoint services

41 LAYER 4 THE TRANSPORT LAYER Manages the transmission of data across a network Manages the flow of data between parties by segmenting long data streams into smaller data chunks (based on allowed packet size for a given transmission medium) Reassembles chunks into their original sequence at the receiving end Provides acknowledgements of successful transmissions and requests resends for packets which arrive with errors

42 LAYER 3 THE NETWORK LAYER Handles addressing messages for delivery, as well as translating logical network addresses and names into their physical counterparts Responsible for deciding how to route transmissions between computers This layer also handles the decisions needed to get data from one point to the next point along a network path This layer also handles packet switching and network congestion control

43 LAYER 2 THE DATA LINK LAYER Handles special data frames (packets) between the Network layer and the Physical layer At the receiving end, this layer packages raw data from the physical layer into data frames for delivery to the Network layer At the sending end this layer handles conversion of data into raw formats that can be handled by the Physical Layer

44 LAYER 1 THE PHYSICAL LAYER Converts bits into electronic signals for outgoing messages Converts electronic signals into bits for incoming messages This layer manages the interface between the the computer and the network medium (coaxial, twisted pair,etc.) This layer tells the driver software for the MAU (media attachment unit, ex. network interface cards (NICs, modems, etc.)) what needs to be sent across the medium The bottom layer of the OSI model

45 THE TCP/IP REFERENCE MODEL Simple Mail Transfer Protocol (SMTP) Real Time Transport Protocol(RTP) Internet Controlled Message Protocol(ICMP) Sychronous Optical Network (SONET) Digital Subscriber Link (DSL)

46 FRAME RELAY Frame Relay is a standardized wide area network technology that specifies the physical and logical link layers of digital telecommunications channels using a packet switching methodology. Originally designed for transport across Integrated Services Digital Network (ISDN) infrastructure, it may be used today in the context of many other network interfaces. Offers speeds of 64 kbps to about 40 Mbps; This covers the range of greatest corporate demand Most demand is at the low end of the range Priced aggressively Both reasons are critical

47 FRAME RELAY Low-Cost Service Packet-Switched Uses virtual circuits to cut costs Unreliable Relatively low speeds Dedicated Connections Always ready to send and receive

48 X.25 X.25 is an ITU-T (International Telecommunication Union)standard protocol suite for packet switched wide area network (WAN) communication. An X.25 WAN consists of packet-switching exchange (PSE) nodes as the networking hardware, and leased lines, Plain old telephone service connections or ISDN(Integrated Service Digital Network) connections as physical links.

49 THE X.25 PROTOCOL The Model Network Has Multiple Nodes (DCEs-data communication equipments) Host Computers (DTEs-data terminal equipments) Outside Hosts Have Addresses Like Phone Numbers Virtual Call Setup Virtual Call Clear Data Transfer DCE X.25 DTE DTE X.25 DCE Intra-Network Protocol DCE DCE X.25 DCE DTE 49

50 THE X.25 PROTOCOL The X.25 Protocol Layers Layer Name Network Link Physical Description X.25 Packet Level X.25 Frame Level (LAPB) RS232, etc LAPB- Link Access Procedure, Balanced is a data link protocol that manages a communication session and controls the packet framing. 50

51 RS-232 CABLE AND CONNECTOR

52 Asynchronous Transfer Mode (ATM) "A transfer mode in which information is organized into cells; it is asynchronous in the sense that the recurrence of cells containing information from an individual user is not necessarily periodic".

53

54 BENEFITS OF ATM high performance via hardware switching dynamic bandwidth for bursty traffic class-of-service support for multimedia scalability in speed and network size common LAN/WAN architecture opportunities for simplification via VC(virtual circuits) architecture international standards compliance

55 Voice ATM Adaptation Layers A/D s 1, s 2 Digital voice samples AAL cells Video A/D picture frames Compression compressed frames AAL cells Data Bursty variable-length packets AAL cells Copyright 2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication Networks Networks: ATM Figure 9.3

56 Asynchronous Transfer Mode(ATM) Voice Data packets Images MUX Wasted bandwidth TDM ATM `

Introduction. Computer Networks: Introduction 1

Introduction. Computer Networks: Introduction 1 Introduction Computer Networks: Introduction 1 Network Definitions and Classification Preliminary definitions and network terminology Sample application paradigms Classifying networks by transmission technology

More information

CS4514 Computer Networks

CS4514 Computer Networks CS4514 Computer Networks Term B07 Professor Bob Kinicki Networks: Introduction 1 Course Objectives Networks: Introduction 2 Course Objectives 1. To develop an understanding of modern network architectures

More information

Introduction. Computer Networks Term B10

Introduction. Computer Networks Term B10 Introduction Computer Networks Term B10 Introduction Outline Preliminary Definitions Internet Components Network Application Paradigms Classifying networks by transmission technology by size/scale by topology

More information

COMPONENTS OF DATA COMMUNICATION

COMPONENTS OF DATA COMMUNICATION COMPONENTS OF DATA COMMUNICATION ANALOG AND DIGITAL TRANSMISSION An analog signal is one that is continuous with respect to time and may take on any value within a given range of values. Eg Human voice.

More information

Introduction to Information Technology Turban, Rainer and Potter John Wiley & Sons, Inc. Copyright 2005

Introduction to Information Technology Turban, Rainer and Potter John Wiley & Sons, Inc. Copyright 2005 Introduction to Information Technology Turban, Rainer and Potter John Wiley & Sons, Inc. Copyright 2005 Network and Telecommunications Basics Chapter Outline The telecommunications system Network services

More information

ITP 140 Mobile Applications Technologies. Networks

ITP 140 Mobile Applications Technologies. Networks ITP 140 Mobile Applications Technologies Networks A First Look Under the Hood 2 3 Communication Channels Mediums for transporting data from one system to another Physical Twisted Pair (CAT-3, CAT-5/6)

More information

Lecture 1 Overview - Data Communications, Data Networks, and the Internet

Lecture 1 Overview - Data Communications, Data Networks, and the Internet DATA AND COMPUTER COMMUNICATIONS Lecture 1 Overview - Data Communications, Data Networks, and the Internet Mei Yang Based on Lecture slides by William Stallings 1 OUTLINE Data Communications and Networking

More information

16/06/56. Communications and Networks. Communications and Networks. Communications and Networks

16/06/56. Communications and Networks. Communications and Networks. Communications and Networks Discuss connectivity, the wireless revolution, and communication systems. Describe physical and wireless communications channels. Discuss connection devices and services, including dial-up, DSL, cable,

More information

ITP 140 Mobile Applications Technologies. Networks

ITP 140 Mobile Applications Technologies. Networks ITP 140 Mobile Applications Technologies Networks A First Look Under the Hood 2 3 Communication Channels Mediums for transporting data from one system to another Physical Twisted Pair (CAT-3, CAT-5/6)

More information

NZQA unit standard version 2 Page 1 of 6. Demonstrate basic knowledge of telecommunications concepts

NZQA unit standard version 2 Page 1 of 6. Demonstrate basic knowledge of telecommunications concepts Page 1 of 6 Title Demonstrate basic knowledge of telecommunications concepts Level 2 Credits 10 Purpose This unit standard covers basic telecommunications principles and is intended for telecommunications

More information

Chapter 1. Uses of Computer Networks Network Hardware Network Software Reference Models Example Networks Network Standardization. Revised: August 2011

Chapter 1. Uses of Computer Networks Network Hardware Network Software Reference Models Example Networks Network Standardization. Revised: August 2011 Introduction ti Chapter 1 Uses of Computer Networks Network Hardware Network Software Reference Models Example Networks Network Standardization Metric Units Revised: August 2011 Uses of Computer Networks

More information

Chapter 1. Introduction

Chapter 1. Introduction Chapter 1 Introduction Computer Networks The old model of a single computer serving all of the organization s computational needs has been replace by one in which a large number of separate but interconnected

More information

Guide to Networking Essentials, 6 th Edition. Chapter 6: Network Reference Models and Standards

Guide to Networking Essentials, 6 th Edition. Chapter 6: Network Reference Models and Standards Guide to Networking Essentials, 6 th Edition Chapter 6: Network Reference Models and Standards Objectives Explain the OSI reference model layers and their relationship to hardware and software Explain

More information

It is the process of sharing data, programs, and information between two or more computers.

It is the process of sharing data, programs, and information between two or more computers. 1 Communications It is the process of sharing data, programs, and information between two or more computers. Numerous applications depend on communication systems: E-mail Instant messaging (IM) Internet

More information

Communications and Networks The McGraw-Hill Companies, Inc. All rights reserved.

Communications and Networks The McGraw-Hill Companies, Inc. All rights reserved. Discuss connectivity, the wireless revolution, and communication systems. Describe physical and wireless communications channels. Discuss connection devices and services, including dial-up, DSL, cable,

More information

Networks 15.2 Multiplexing Technologies Access Networks 15.5 Common Peripheral Interfaces

Networks 15.2 Multiplexing Technologies Access Networks 15.5 Common Peripheral Interfaces Chapter 15 Computer and Multimedia Networks 15.11 Basics of Computer and Multimedia Networks 15.2 Multiplexing Technologies 15.3 LAN and WAN 15.4 Access Networks 15.5 Common Peripheral Interfaces 15.6

More information

TCOM 370 NOTES 99-1 NETWORKING AND COMMUNICATIONS

TCOM 370 NOTES 99-1 NETWORKING AND COMMUNICATIONS TCOM 370 NOTES 99-1 NETWORKING AND COMMUNICATIONS Communication Networks Allow Exchange of Information between Users telephone network for voice communication interconnected computers and peripherals,

More information

Router Router Microprocessor controlled traffic direction home router DSL modem Computer Enterprise routers Core routers

Router Router Microprocessor controlled traffic direction home router DSL modem Computer Enterprise routers Core routers Router Router is a Microprocessor controlled device that forwards data packets across the computer network. It is used to connect two or more data lines from different net works. The function of the router

More information

IT114 NETWORK+ Learning Unit 1 Objectives: 1, 2 Time In-Class Time Out-Of-Class Hours 2-3. Lectures: Course Introduction and Overview

IT114 NETWORK+ Learning Unit 1 Objectives: 1, 2 Time In-Class Time Out-Of-Class Hours 2-3. Lectures: Course Introduction and Overview IT114 NETWORK+ Course Objectives Upon successful completion of this course, the student will be able to: 1. Identify the devices and elements of computer networks; 2. Diagram network models using the appropriate

More information

Local Area Network Overview

Local Area Network Overview Local Area Network Overview Chapter 15 CS420/520 Axel Krings Page 1 LAN Applications (1) Personal computer LANs Low cost Limited data rate Back end networks Interconnecting large systems (mainframes and

More information

SYSTEMS ADMINISTRATION USING CISCO (315)

SYSTEMS ADMINISTRATION USING CISCO (315) Page 1 of 11 Contestant Number: Time: Rank: SYSTEMS ADMINISTRATION USING CISCO (315) REGIONAL 2016 Multiple Choice: Multiple Choice (50 @ 10 points each) TOTAL POINTS (500 points) (500 points) Failure

More information

Data Communication. Introduction of Communication. Data Communication. Elements of Data Communication (Communication Model)

Data Communication. Introduction of Communication. Data Communication. Elements of Data Communication (Communication Model) Data Communication Introduction of Communication The need to communicate is part of man s inherent being. Since the beginning of time the human race has communicated using different techniques and methods.

More information

Bridging and Switching Basics

Bridging and Switching Basics CHAPTER 4 Bridging and Switching Basics This chapter introduces the technologies employed in devices loosely referred to as bridges and switches. Topics summarized here include general link-layer device

More information

Network Protocols. Terms you ll need to understand: Techniques you ll need to master:

Network Protocols. Terms you ll need to understand: Techniques you ll need to master: 3 Network Protocols Terms you ll need to understand: OSI Reference Model Application layer Presentation layer Session layer Transport layer Network layer Data Link layer Physical layer IEEE 802 specifications

More information

Typical Network Uses

Typical Network Uses Computer Networks Introduction The next Great Revolution - Computer Networks- computers connected together for exchanging information Our information-oriented society - applications in education, commerce,

More information

PPP. Point-to-Point Protocol

PPP. Point-to-Point Protocol PPP Point-to-Point Protocol 1 Introduction One of the most common types of WAN connection is the point-to-point connection. Point-to-point connections are used to connect LANs to service provider WANs,

More information

CS-461 Internetworking. Dr. Mohamed Aboutabl

CS-461 Internetworking. Dr. Mohamed Aboutabl CS-461 Internetworking Dr. Mohamed Aboutabl http://www.cs.jmu.edu/users/aboutams The McGraw-Hill Companies, Inc., 2000 1 Chapter 1 Introduction The McGraw-Hill Companies, Inc., 2000 2 Internet today Network

More information

Review of Network Technologies

Review of Network Technologies Indian Institute of Technology Kharagpur Review of Network Technologies Prof. Indranil Sen Gupta Dept. of Computer Science & Engg. I.I.T. Kharagpur, INDIA Lecture 2: Review of network technologies On completion,

More information

Layer 2 functionality bridging and switching

Layer 2 functionality bridging and switching Layer 2 functionality bridging and switching BSAD 141 Dave Novak Sources: Network+ Guide to Networks, Dean 2013 Overview Layer 2 functionality Error detection Bridges Broadcast and collision domains How

More information

Internetworking Concepts Overview. 2000, Cisco Systems, Inc. 2-1

Internetworking Concepts Overview. 2000, Cisco Systems, Inc. 2-1 Internetworking Concepts Overview 2000, Cisco Systems, Inc. 2-1 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a 2-2 Objectives On completion of this chapter, you will be able to perform the following

More information

Data Communication and Network. Introducing Networks

Data Communication and Network. Introducing Networks Data Communication and Network Introducing Networks Introduction to Networking Computer network, or simply network Refers to the connection of two or more computers by some type of medium You can connect

More information

A LAN is a high-speed data network that covers a relatively small geographic area. It typically connects workstations, personal computers, printers,

A LAN is a high-speed data network that covers a relatively small geographic area. It typically connects workstations, personal computers, printers, CBCN4103 A LAN is a high-speed data network that covers a relatively small geographic area. It typically connects workstations, personal computers, printers, servers, and other devices. LANs offer computer

More information

Computer Networks. Andrew S. Tanenbaum

Computer Networks. Andrew S. Tanenbaum Computer Networks Third Edition Andrew S. Tanenbaum 1 ; l Vrije Universiteit Amsterdam, The Netherlands For book and bookstore information Prentice Hall PTR Upper Saddle River, New Jersey 07458 CONTENTS

More information

Session 3 Networks I

Session 3 Networks I 15.561 Information Technology Essentials Session 3 Networks I Copyright 2005 Thomas Malone, Chris Dellarocas, Stuart Madnick Acknowledgments: Slides marked SM are adapted from Stuart Madnick, MIT. Slides

More information

Computer Communication Networks Lecture No. 1

Computer Communication Networks Lecture No. 1 Computer Communication Networks Lecture No. 1 Reference books used in lectures 1- Computer Networks, Tanenbaum 2- Communication networks, Sharam Hekmat 3- Computer Networks, a system approach, L. Peterson

More information

Outline: Connecting Many Computers

Outline: Connecting Many Computers Outline: Connecting Many Computers Last lecture: sending data between two computers This lecture: link-level network protocols (from last lecture) sending data among many computers 1 Review: A simple point-to-point

More information

Operating Systems. 16. Networking. Paul Krzyzanowski. Rutgers University. Spring /6/ Paul Krzyzanowski

Operating Systems. 16. Networking. Paul Krzyzanowski. Rutgers University. Spring /6/ Paul Krzyzanowski Operating Systems 16. Networking Paul Krzyzanowski Rutgers University Spring 2015 1 Local Area Network (LAN) LAN = communications network Small area (building, set of buildings) Same, sometimes shared,

More information

Chapter 14: Introduction to Networking

Chapter 14: Introduction to Networking Chapter 14: Introduction to Networking Complete CompTIA A+ Guide to PCs, 6e How different networks are wired (or wireless) How to identify common network cables How Ethernet works About the OSI and TCP/IP

More information

Introduction. The fundamental purpose of data communications is to exchange information between user's computers, terminals and applications programs.

Introduction. The fundamental purpose of data communications is to exchange information between user's computers, terminals and applications programs. Introduction The fundamental purpose of data communications is to exchange information between user's computers, terminals and applications programs. Simplified Communications System Block Diagram Intro-1

More information

Electrical and Telecommunications Engineering Technology_TCET3142/TC570 NEW YORK CITY COLLEGE OF TECHNOLOGY THE CITY UNIVERSITY OF NEW YORK

Electrical and Telecommunications Engineering Technology_TCET3142/TC570 NEW YORK CITY COLLEGE OF TECHNOLOGY THE CITY UNIVERSITY OF NEW YORK NEW YORK CITY COLLEGE OF TECHNOLOGY THE CITY UNIVERSITY OF NEW YORK DEPARTMENT: COURSE CODE: COURSE TITLE: Electrical and Telecommunications Engineering Technology TCET 3142/TC570 Computer Systems and

More information

Computers Are Your Future

Computers Are Your Future Computers Are Your Future Networks: Communicating and Sharing Resources. Network Fundamentals What You Will Learn About Basic networking concepts Advantages and disadvantages of networks Peer-to-peer and

More information

Computer Networks 2012/2013. Introduction part 1 (01) Dr. Tanir Ozcelebi. Thanks to A. Leon-Garcia & I. Widjaja, & I. Radovanovic & A. S.

Computer Networks 2012/2013. Introduction part 1 (01) Dr. Tanir Ozcelebi. Thanks to A. Leon-Garcia & I. Widjaja, & I. Radovanovic & A. S. Computer Networks 2012/20 Introduction part 1 (01) Dr. Thanks to A. Leon-Garcia & I. Widjaja, & I. Radovanovic & A. S. Tanenbaum System Architecture and Networking Group Outline What is the Internet? Why

More information

ก ก Information Technology II

ก ก Information Technology II ก ก 202103 Information Technology II ก ก ก ก ก (LAN), ก LAN, ก ก (LAN) ก ก ก LAN ก LAN ก LAN Topology Bus LAN Star LAN Ring LAN Wireless LAN Wireless LAN Wireless ก (LAN) ก ก ก LAN ก LAN WAN ก Random Access

More information

A+ Guide to Hardware: Managing, Maintaining, and Troubleshooting, 5e. Chapter 10 Networking Essentials

A+ Guide to Hardware: Managing, Maintaining, and Troubleshooting, 5e. Chapter 10 Networking Essentials A+ Guide to Hardware: Managing, Maintaining, and Troubleshooting, 5e Chapter 10 Networking Essentials Objectives Learn about hardware devices used for networking Learn about the different types of networks

More information

CCM 4300 Lecture 5 Computer Networks, Wireless and Mobile Communications. Dr Shahedur Rahman. Room: T115

CCM 4300 Lecture 5 Computer Networks, Wireless and Mobile Communications. Dr Shahedur Rahman. Room: T115 CCM 4300 Lecture 5 Computer Networks, Wireless and Mobile Communications Dr Shahedur Rahman s.rahman@mdx.ac.uk Room: T115 1 Recap of Last Session Described the physical layer Analogue and Digital signal

More information

More on LANS. LAN Wiring, Interface

More on LANS. LAN Wiring, Interface More on LANS Chapters 10-11 LAN Wiring, Interface Mostly covered this material already NIC = Network Interface Card Separate processor, buffers incoming/outgoing data CPU might not be able to keep up network

More information

Network Architecture. TOC Architecture

Network Architecture. TOC Architecture Network Architecture Introduction Layering Example Internet Layers First Look Layering Step by Step Downside of Layering Interconnecting Networks The Internet TOC Architecture Introduction Issues: Inter-operability

More information

CCNA Exploration1 Chapter 7: OSI Data Link Layer

CCNA Exploration1 Chapter 7: OSI Data Link Layer CCNA Exploration1 Chapter 7: OSI Data Link Layer LOCAL CISCO ACADEMY ELSYS TU INSTRUCTOR: STELA STEFANOVA 1 Explain the role of Data Link layer protocols in data transmission; Objectives Describe how the

More information

Chapter 11: Wide-Area Networks and the Internet

Chapter 11: Wide-Area Networks and the Internet Chapter 11: Wide-Area Networks and the Internet MULTIPLE CHOICE 1. MAN stands for: a. Manchester Access Network c. Metropolitan-Area Network b. Multiple-Area Network d. Multiple Access Network 2. Packet

More information

06/02/2006. Local & Metropolitan Area Networks 1. INTRODUCTION. Why Study Local and Metropolitan Area Networks? ACOE322. Lecture 1 Introduction

06/02/2006. Local & Metropolitan Area Networks 1. INTRODUCTION. Why Study Local and Metropolitan Area Networks? ACOE322. Lecture 1 Introduction Local & Metropolitan Area Networks ACOE322 Lecture 1 Introduction 1 1. INTRODUCTION In this section we will cover : 1. Overview of data communications and networking 2. Definition and overview of LANs,

More information

Fundamental Issues. System Models and Networking Chapter 2,3. System Models. Architectural Model. Middleware. Bina Ramamurthy

Fundamental Issues. System Models and Networking Chapter 2,3. System Models. Architectural Model. Middleware. Bina Ramamurthy System Models and Networking Chapter 2,3 Bina Ramamurthy Fundamental Issues There is no global time. All communications are by means of messages. Message communication may be affected by network delays

More information

Technology in Action. Chapter 12 Behind the Scenes: Networking and Security. Copyright 2010 Pearson Education, Inc. Publishing as Prentice Hall

Technology in Action. Chapter 12 Behind the Scenes: Networking and Security. Copyright 2010 Pearson Education, Inc. Publishing as Prentice Hall Technology in Action Chapter 12 Behind the Scenes: Networking and Security 1 Networking Advantages Networks Increase productivity Enable the sharing of hardware resources Facilitate knowledge sharing Enable

More information

Internetworking is connecting two or more computer networks with some sort of routing device to exchange traffic back and forth, and guide traffic on

Internetworking is connecting two or more computer networks with some sort of routing device to exchange traffic back and forth, and guide traffic on CBCN4103 Internetworking is connecting two or more computer networks with some sort of routing device to exchange traffic back and forth, and guide traffic on the correct path across the complete network

More information

Pengantar Teknologi Informasi dan Teknologi Hijau. Suryo Widiantoro, ST, MMSI, M.Com(IS)

Pengantar Teknologi Informasi dan Teknologi Hijau. Suryo Widiantoro, ST, MMSI, M.Com(IS) Pengantar Teknologi Informasi dan Teknologi Hijau Suryo Widiantoro, ST, MMSI, M.Com(IS) 1 Topics covered 1. From analog to digital age 2. Networks 3. Wired-communication data 4. Wireless-communication

More information

Data Networks. Lecture 1: Introduction. September 4, 2008

Data Networks. Lecture 1: Introduction. September 4, 2008 Data Networks Lecture 1: Introduction September 4, 2008 Slide 1 Learning Objectives Fundamental aspects of network Design and Analysis: Architecture: layering, topology design, switching mechanisms Protocols:

More information

Network Media and Layer 1 Functionality

Network Media and Layer 1 Functionality Network Media and Layer 1 Functionality BSAD 146 Dave Novak Dean, Chapter 3, pp 93-124 Objectives Introduction to transmission media Basic cabling Coaxial Twisted pair Optical fiber Basic wireless (NIC)

More information

GAYATRI COMPUTERS Prepared by : VENKAT.G 1. Module 1: NETWORK BASICS

GAYATRI COMPUTERS Prepared by : VENKAT.G 1. Module 1: NETWORK BASICS GAYATRI COMPUTERS Prepared by : VENKAT.G 1 What is Networking? Module 1: NETWORK BASICS Networking: Connecting two or more computers or network devices(routers/print Servers / Firewall Devices..etc) for

More information

Introduction to computer networking

Introduction to computer networking edge core Introduction to computer networking Comp Sci 3600 Security Outline edge core 1 2 edge 3 core 4 5 6 The edge core Outline edge core 1 2 edge 3 core 4 5 6 edge core Billions of connected computing

More information

WAN Technologies (to interconnect IP routers) Mario Baldi

WAN Technologies (to interconnect IP routers) Mario Baldi WAN Technologies (to interconnect IP routers) Mario Baldi www.baldi.info WAN_Technologies - 1 Copyright: see page 2 Copyright Notice This set of transparencies, hereinafter referred to as slides, is protected

More information

06/02/ Local & Metropolitan Area Networks 0. INTRODUCTION. 1. History and Future of TCP/IP ACOE322

06/02/ Local & Metropolitan Area Networks 0. INTRODUCTION. 1. History and Future of TCP/IP ACOE322 1 Local & Metropolitan Area Networks ACOE322 Lecture 5 TCP/IP Protocol suite and IP addressing 1 0. INTRODUCTION We shall cover in this topic: 1. The relation of TCP/IP with internet and OSI model 2. Internet

More information

# DEFINITIONS TERMS. 5) A set of devices interconnected by media links. Network

# DEFINITIONS TERMS. 5) A set of devices interconnected by media links. Network CHAPTER 21 INTRODUCTION TO DATA COMMUNICATIONS AND NETWORKING # DEFINITIONS TERMS 1) Information that is stored in digital form. Information that has been processed, organized and stored. Data 2) Knowledge

More information

COS 140: Foundations of Computer Science

COS 140: Foundations of Computer Science COS 140: Foundations of C Networks Fall 2017 Copyright c 2002 2017 UMaine School of Computing and Information S 1 / 21 Homework, announcements New chapter (23) online No homework assigned today, sorry!

More information

Computer Networks Question Bank

Computer Networks Question Bank Computer Networks Question Bank 1. Describe in detail OSI Model ANS: OSI (Open Systems Interconnection) is reference model for how applications can communicate over a network. A reference model is a conceptual

More information

Goals. Fundamentals of Network Media. More topics. Topics. Multiple access communication. Multiple access solutions

Goals. Fundamentals of Network Media. More topics. Topics. Multiple access communication. Multiple access solutions Fundamentals of Network Media Local Area Networks Ursula Holmström Goals Learn the basic concepts related to LAN technologies, for example use of shared media medium access control topologies Know the

More information

1. The MAC controller works at the LLC sublayer by initiating the communications link between nodes, among other functions.

1. The MAC controller works at the LLC sublayer by initiating the communications link between nodes, among other functions. CS216 Midterm Chapters 1, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12 True/False Indicate whether the statement is true or false. 1. The MAC controller works at the LLC sublayer by initiating the communications link

More information

Goals and topics. Verkkomedian perusteet Fundamentals of Network Media T Circuit switching networks. Topics. Packet-switching networks

Goals and topics. Verkkomedian perusteet Fundamentals of Network Media T Circuit switching networks. Topics. Packet-switching networks Verkkomedian perusteet Fundamentals of Media T-110.250 19.2.2002 Antti Ylä-Jääski 19.2.2002 / AYJ lide 1 Goals and topics protocols Discuss how packet-switching networks differ from circuit switching networks.

More information

Networking and Health Information Exchange Unit 1a ISO Open Systems Interconnection (OSI) Slide 1. Slide 2. Slide 3

Networking and Health Information Exchange Unit 1a ISO Open Systems Interconnection (OSI) Slide 1. Slide 2. Slide 3 Slide 1 Networking and Health Information Exchange Unit 1a ISO Open Systems Interconnection (OSI) Networking and Health Information Exchange Unit 1a ISO Open Systems Interconnection (OSI) Slide 2 Unit

More information

Performance Evaluation of FDDI, ATM, and Gigabit Ethernet as Backbone Technologies Using Simulation

Performance Evaluation of FDDI, ATM, and Gigabit Ethernet as Backbone Technologies Using Simulation Performance Evaluation of FDDI, ATM, and Gigabit Ethernet as Backbone Technologies Using Simulation Sanjay P. Ahuja, Kyle Hegeman, Cheryl Daucher Department of Computer and Information Sciences University

More information

Automatic Repeat Request Data Link Layer Traffic Management

Automatic Repeat Request Data Link Layer Traffic Management Automatic Repeat Request Data Link Layer Traffic Management Reliable Communications with Retransmission How to transport data units over an unreliable data link in a reliable way? End to End E.g.. TCP

More information

CSC Introduction to Computers and Their Applications. Background

CSC Introduction to Computers and Their Applications. Background CSC 170 - Introduction to Computers and Their Applications Lecture 7 The Internet Background The history of the Internet begins in 1957. In a response to the Soviet Union launching Sputnik, the first man-made

More information

Distributed Queue Dual Bus

Distributed Queue Dual Bus Distributed Queue Dual Bus IEEE 802.3 to 802.5 protocols are only suited for small LANs. They cannot be used for very large but non-wide area networks. IEEE 802.6 DQDB is designed for MANs It can cover

More information

Part 5: Link Layer Technologies. CSE 3461: Introduction to Computer Networking Reading: Chapter 5, Kurose and Ross

Part 5: Link Layer Technologies. CSE 3461: Introduction to Computer Networking Reading: Chapter 5, Kurose and Ross Part 5: Link Layer Technologies CSE 3461: Introduction to Computer Networking Reading: Chapter 5, Kurose and Ross 1 Outline PPP ATM X.25 Frame Relay 2 Point to Point Data Link Control One sender, one receiver,

More information

CompTIA Network+ Course

CompTIA Network+ Course CompTIA Network+ Course Duration: 5 Days Course Delivery: Classroom Language: English Target Audience Comprehensive approach to both preparing a student for CompTIA's Network+ exam and developing proficiency

More information

Optical networking technology

Optical networking technology 1 Optical networking technology Technological advances in semiconductor products have essentially been the primary driver for the growth of networking that led to improvements and simplification in the

More information

Networking Devices. Punch_down panels

Networking Devices. Punch_down panels Networking Devices Punch_down panels Hubs Switches Bridges Routes Gateways Network Interface Cards (NICs) Wireless access points Modems 1 Punch_down panels Wiring closets Labeling schemes 2 1 Hubs The

More information

LANs do not normally operate in isolation. They are connected to one another or to the Internet. To connect LANs, connecting devices are needed.

LANs do not normally operate in isolation. They are connected to one another or to the Internet. To connect LANs, connecting devices are needed. LAN interconnecting devices INTRODUCTION LANs do not normally operate in isolation. They are connected to one another or to the Internet. To connect LANs, connecting devices are needed. Connecting devices

More information

Networking and Health Information Exchange: ISO Open System Interconnection (OSI)

Networking and Health Information Exchange: ISO Open System Interconnection (OSI) Networking and Health Information Exchange: ISO Open System Interconnection (OSI) Lecture 4 Audio Transcript Slide 1 Welcome to Networking and Health Information Exchange, ISO Open System Interconnection

More information

Lecture Outline. Lecture 2. OSI model and networking. The OSI model and networking. The OSI model and networking. The OSI model and networking

Lecture Outline. Lecture 2. OSI model and networking. The OSI model and networking. The OSI model and networking. The OSI model and networking Lecture 2 The OSI model Chapter 2, specifically pages 42-58 Dave Novak School of Business Administration, University of Vermont Sources: 1) Network+ Guide to Networks, Dean 2013 2) Comer, Computer Networks

More information

Network Communications Standards. Applied Information Technology

Network Communications Standards. Applied Information Technology Network Communications Standards Applied Information Technology Network Standards Why do we need network standards? Defined guidelines for how computers or networked devices communicate Think of it as

More information

Tutorials and Practicals 31W6 ADMINISTRIVIA. A Communications Model. Communications and Networks. Simplified Communications

Tutorials and Practicals 31W6 ADMINISTRIVIA. A Communications Model. Communications and Networks. Simplified Communications 31W6 ADMINISTRIVIA Lectures Weeks 1-9: Mon 1100 B4 Tue 1400 B4 Fri 1000 A1 Weeks 10-12 Mon 1400 A3 Wed Fri 1200 V1 1100 A3 Tutorials and Practicals Tutorials Wed 0900 3B146 *** Wed 1000 3B146 Thur 1000

More information

Introduction to Networks Network Types. BTEC Nat IT Computer Networks

Introduction to Networks Network Types. BTEC Nat IT Computer Networks Introduction to Networks Network Types 1 BTEC Nat IT Computer Networks Different types of Networks Understand the purpose of a computer network Create network drawings Understand Packet Switching BTEC

More information

Chapter One: Networking Fundamentals Computer Networks

Chapter One: Networking Fundamentals Computer Networks 1.1 Bandwidth Bandwidth is defined as the amount of information that can flow through a network connection in a given period of time. It is important to understand the concept of bandwidth for the following

More information

COMPUTER NETWORKS MODEL QUESTION PAPER WITH SOLUTION. (c) Peer-to-peer processes are processes on two or more devices communicating at a

COMPUTER NETWORKS MODEL QUESTION PAPER WITH SOLUTION. (c) Peer-to-peer processes are processes on two or more devices communicating at a COMPUTER NETWORKS MODEL QUESTION PAPER WITH SOLUTION Q-1(a) In half-duplex transmission, only one entity can send at a time; in a full-duplex transmission, both entities can send at the same time. (b)

More information

Network Connectivity and Mobility Part 2

Network Connectivity and Mobility Part 2 Network Connectivity and Mobility Part 2 BSAD 141 Dave Novak Topics Covered Lecture is structured based on the five elements of creating a connected world from the text book (with additional content) 1.

More information

Internet. Class-In charge: S.Sasirekha

Internet. Class-In charge: S.Sasirekha Internet Class-In charge: S.Sasirekha COMPUTER NETWORK A computer network is a collection of two or more computers, which are connected together to share information and resources. Network Operating Systems

More information

CS 428/528 Computer Networks Lecture 01. Yan Wang

CS 428/528 Computer Networks Lecture 01. Yan Wang 1 CS 428/528 Computer Lecture 01 Yan Wang 2 Motivation: Why bother? Explosive growth of networks 1989, 100,000 hosts on the Internet Distributed Applications and Systems E-mail, WWW, multimedia, distributed

More information

Introduction to Networking

Introduction to Networking Introduction to Networking Chapters 1 and 2 Outline Computer Network Fundamentals Defining a Network Networks Defined by Geography Networks Defined by Topology Networks Defined by Resource Location OSI

More information

04/03/33. Dr.Gihan Naguib. Overview. Dr.Gihan Naguib Behrouz A. Forouzan Data communications and Networking

04/03/33. Dr.Gihan Naguib. Overview. Dr.Gihan Naguib Behrouz A. Forouzan Data communications and Networking PART I Overview of Data Communications and Networking Dr.Gihan Naguib Behrouz A. Forouzan Data communications and Networking 1 Overview 2 1 Chapters Chapter 1 Introduction Chapter 2 Network Models 3 Chapter

More information

2. LAN Topologies Gilbert Ndjatou Page 1

2. LAN Topologies Gilbert Ndjatou Page 1 2. LAN Topologies Two basic categories of network topologies exist, physical topologies and logical topologies. The physical topology of a network is the cabling layout used to link devices. This refers

More information

Cisco Cisco Certified Network Associate (CCNA)

Cisco Cisco Certified Network Associate (CCNA) Cisco 200-125 Cisco Certified Network Associate (CCNA) http://killexams.com/pass4sure/exam-detail/200-125 Question: 769 Refer to exhibit: Which destination addresses will be used by Host A to send data

More information

Synchronous Optical Networks SONET. Computer Networks: SONET

Synchronous Optical Networks SONET. Computer Networks: SONET Synchronous Optical Networks SONET 1 Telephone Networks {Brief History} Digital carrier systems The hierarchy of digital signals that the telephone network uses. Trunks and access links organized in DS

More information

Operating Systems CS 571

Operating Systems CS 571 Computer Networks: Overview Operating Systems CS 571 Network types Range Bandwidth (Mbps) Latency (ms) LAN 1-2 kms 10-1000 1-10 WAN worldwide 0.010-600 100-500 MAN 2-50 kms 1-150 10 Wireless LAN 0.15-1.5

More information

Chapter 3. Wired and Wireless Communication. What You Will Learn... Computers Are Your Future. What You Will Learn...

Chapter 3. Wired and Wireless Communication. What You Will Learn... Computers Are Your Future. What You Will Learn... What You Will Learn... Computers Are Your Future Chapter 3 The definition of bandwidth The bandwidth needs of a typical user How modems change digital signals into analog Transmission media and methods

More information

Patch Panel Cable Guide 3-5-3

Patch Panel Cable Guide 3-5-3 Net... 5... 5... 5... 7... 8... 8... LAN - - WAN - - 9... - - 9... 9... - 4-9... - 4-... - 4-... 4-4-... Hub and Spoke 5-4- 4... Full Mesh 6-4- 5...Partial Mesh 7-4- 6... 8-4- 6... 7.... Client/Server

More information

Chapter 4: Communication Technology. Solutions

Chapter 4: Communication Technology. Solutions Chapter 4: Communication Technology Solutions Summative Assessment Multiple-Choice Questions (MCQs) 1. Two examples of network are telephone and. a. Radio b. Transmission c. Globe d. All of the above 2.

More information

Computer Network??? Why Computer Networks? Network Classification. Introduction to Computer Networks. Classification of a Computer network by Scale

Computer Network??? Why Computer Networks? Network Classification. Introduction to Computer Networks. Classification of a Computer network by Scale Computer Network??? A computer network is an interconnection of a group of computers and the world of computers Introduction to Computer Networks Budditha Hettige Why Computer Networks? Resource Sharing

More information

Data Link Protocols. TCP/IP Suite and OSI Reference Model

Data Link Protocols. TCP/IP Suite and OSI Reference Model Data Link Protocols Relates to Lab. This module covers data link layer issues, such as local area networks (LANs) and point-to-point links, Ethernet, and the Point-to-Point Protocol (PPP). 1 TCP/IP Suite

More information

Twelfth Edition. Chapter 8: Wired and Wireless Communication. Copyright 2012 Pearson Education, Inc. Publishing as Prentice Hall 1

Twelfth Edition. Chapter 8: Wired and Wireless Communication. Copyright 2012 Pearson Education, Inc. Publishing as Prentice Hall 1 Computers Are Your Future Twelfth Edition Chapter 8: Wired and Wireless Communication Copyright 2012 Pearson Education, Inc. Publishing as Prentice Hall 1 Wired and Wireless Communication Copyright 2012

More information

A+ Guide to Managing & Maintaining Your PC, 8th Edition. Chapter 16 Networking Types, Devices, and Cabling

A+ Guide to Managing & Maintaining Your PC, 8th Edition. Chapter 16 Networking Types, Devices, and Cabling A+ Guide to Managing & Maintaining Your PC, Chapter 16 Networking Types, Devices, and Cabling Objectives Learn about network types and topologies Learn about the hardware used to build local networks Learn

More information

Introduction to Computer Networks. Budditha Hettige

Introduction to Computer Networks. Budditha Hettige Introduction to Computer Networks Budditha Hettige Computer Network??? A computer network is an interconnection of a group of computers and the world of computers Why Computer Networks? Resource Sharing

More information