Unit27-networking BTEC NAT – UNIT 27 NETWORKING OSI MODEL Unit Leader:Dave Bell

Slides:

Advertisements

Similar presentations

Introduction to TCP/IP

Advertisements

Why to learn OSI reference Model? The answer is too simple that It tells us that how communication takes place between computers on internet but how??

Open System Interconnection

1 The 7 layer OSI model Sending an . 2 The seven layers.

© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public 1 Version 4.0 Communicating over the Network Network Fundamentals – Chapter 2.

International Standards Organization Open Systems Interconnect (OSI) Reference Model Advanced Computer Networks.

Jacob Boston Josh Pfeifer. Definition of HyperText Transfer Protocol How HTTP works How Websites work GoDaddy.com OSI Model Networking.

Introduction To Networking

OSI Model 7 Layers 7. Application Layer 6. Presentation Layer

The OSI Model A layered framework for the design of network systems that allows communication across all types of computer systems regardless of their.

Networks 2 Network Layer Models Dr John Cowell

DISCLAIMER:  If you think you know it all, don’t shout out the answers! Go here:  game.shtml

Data Communications and Networks

OSI Reference Model & Layered Communication Sritrusta Sukaridhoto.

Presentation on Osi & TCP/IP MODEL

Computer Networks.  The OSI model is a framework containing seven layers that defines the protocols and devices used at each stage of the process when.

Internet Addresses. Universal Identifiers Universal Communication Service - Communication system which allows any host to communicate with any other host.

© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public 1 Version 4.0 Network Services Networking for Home and Small Businesses – Chapter 6.

Computer Communication & Networks Lecture # 02 Nadeem Majeed Choudhary

THE OSI REFERENCE MODEL Open Systems Interconnection (OSI) International Organization for Standardization( ISO)

© McLean HIGHER COMPUTER NETWORKING Lesson 1 – Protocols and OSI What is a network protocol Description of the OSI model.

1 Review - OSI Model n OSI Reference Model u represents the communications process. u 7 layers: physical, data link, network, transport, session, presentation.

Layer Architecture Layer architecture simplifies the network design. It is easy to debug network applications in a layered architecture network. The network.

The OSI Model An ISO (International standard Organization) that covers all aspects of network communications is the Open System Interconnection (OSI) model.

© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public 1 Version 4.0 OSI Transport Layer Network Fundamentals – Chapter 4.

Higher National Diploma1 Network Concepts OSI 7 Layer model.

OSI Model. Topics What is the OSI Model? What is a Protocol? Why 7 Layers? The 7 Layers – Application – Presentation – Session – Transport – Network –

©Brooks/Cole, 2003 Model and protocol  A model is the specification set by a standards organization as a guideline for designing networks.  A protocol.

First, by sending smaller individual pieces from source to destination, many different conversations can be interleaved on the network. The process.

Network Architecture Models School of Business Eastern Illinois University © Abdou Illia, Spring 2007 (Week 2, Thursday 1/18/2007)

Data Communications and Networks

Open System Interconnection Describe how information from a software application in one computer moves through a network medium to a software application.

Individual Project 1 Sarah Pritchard. Fran, a customer of your company, would like to visit your company’s website from her home computer… How does your.

OSI means Open System Interconnect model. OSI means Open System Interconnect model. Developed by the International Organization for Standardization in.

Protocol Suits and Layering Models OSI Model Dr. Abraham UTPA.

Net 221D:Computer Networks Fundamentals

Lecture # 02 Network Models Course Instructor: Engr. Sana Ziafat.

The OSI Model A Framework for Communications David A. Abarca July 19, 2005.

OSI Model. Open Systems Interconnection (OSI) is a set of internationally recognized, non proprietary standards for networking and for operating system.

OSI ARCHITECTURE IN OSI, ACTUAL INFORMATION IS OVERHEADED BY PROTOCOL LAYERS IF ALL SEVEN LAYERS ARE OVERHEADED, THEN AS LITTLE AS 15% OF THE TRANSMITTED.

Prepared by: PACE Academy ( Welcome to CCNAX Cisco Certified Network Associate Version 2 ( ) Recognize the purpose and functions.

THE OSI REFERENCE MODEL

TCP/IP Protocol Suite Suresh Kr Sharma 1 The OSI Model and the TCP/IP Protocol Suite Established in 1947, the International Standards Organization (ISO)

Week #8 OBJECTIVES Chapter #5. CHAPTER 5 Making Networks Work Two Networking Models –OSI OPEN SYSTEMS INTERCONNECTION PROPOSED BY ISO –INTERNATIONAL STANDARDS.

Network Models. The OSI Model Open Systems Interconnection (OSI). Developed by the International Organization for Standardization (ISO). Model for understanding.

Mr. Sathish Kumar. M Department of Electronics and Communication Engineering I’ve learned that people will forget what you said, people will forget what.

Computer Network Lab. 1 3 장 OSI 기본 참조 모델 n OSI : Open System Interconnection n Basic Reference Model : ISO-7498 n Purpose of OSI Model ~ is to open communication.

The OSI Model. Understanding the OSI Model In early 1980s, manufacturers began to standardize networking so that networks from different manufacturers.

Lecture # 02 Network Models Course Instructor: Engr. Sana Ziafat.

Networking Using the OSI Model.

The OSI Model & TCP/IP model

Introduction to Technology Infrastructure

Chapter 3 Understanding the OSI Model

Click to edit Master subtitle style

Part I. Overview of Data Communications and Networking

CHAPTER 2 THE OSI MODEL.

The OSI 7 Layer Model.

Introduction to Technology Infrastructure

Layered Task, OSI Model, TCP/IP Model

Chapter 3: Open Systems Interconnection (OSI) Model

Network Protocol Layers

OSI Model The Seven Layers

The OSI 7 Layer Model Ben, Stuart, Charles.

Network Architecture Models

Protocol Application TCP/IP Layer Model

OSI Reference Model Unit II

OSI Model 7 Layers 7. Application Layer 6. Presentation Layer

Open System Interconnect (OSI).

Presentation transcript:

Unit27-networking BTEC NAT – UNIT 27 NETWORKING OSI MODEL Unit Leader:Dave Bell

Unit27-networking THE OSI 7 LAYER MODEL Open Systems Interconnection A standard description or “reference model” for how messages should be transmitted between any two points in a telecommunication network A standard description or “reference model” for how messages should be transmitted between any two points in a telecommunication network Any two computers can communicate when connected regardless of underlying architecture Any two computers can communicate when connected regardless of underlying architecture

Unit27-networking The OSI 7 Layer Model Application layer Presentation layer Session layer Transport layer Network layer Data Link layer Physical layer User services, application, activities Actual data transmission communications subnet

Unit27-networking THE OSI SEVEN LAYER MODEL UPPER 4 LEVELS UPPER 4 LEVELS message passing – from computer to computer LOWER 3 LEVELS LOWER 3 LEVELS message passing – through host computer to another PURPOSE PURPOSE to separate specific functions

Unit27-networking APPLICATION LAYER 7 Interacts with applications for communication purposes Determines identity & availability of communications partners Determines identity & availability of communications partners Determines sufficient resources available Determines sufficient resources available Controls the communication - Controls the communication - cooperation between applications

Unit27-networking PRESENTATION LAYER 6 Presents data to the user in understandable format Provides conversion functions for application layer data Data representation – graphic formats Data representation – graphic formats Character representation – text / ASCII Character representation – text / ASCII Data compressionData encryption Data compressionData encryption

Unit27-networking SESSION LAYER 5 Manages connections between machines Determines whether all data transmitted / received Establishes logical connection for communication Establishes logical connection for communication Checks data received – retransmits if necessary Checks data received – retransmits if necessary Reconnects on premature termination Reconnects on premature termination Releases logical connection on completion Releases logical connection on completion

Unit27-networking TRANSPORT LAYER 4 Decides upon network to use depending on data type Flow control – enough space to send/receive messages Flow control – enough space to send/receive messages Multiplexing – combines messages to same connection Multiplexing – combines messages to same connection Packeting – breaks larger into smaller pieces Packeting – breaks larger into smaller pieces Error checking and recovery Error checking and recovery Firewalls, Security & Prioritisation Firewalls, Security & Prioritisation

Unit27-networking NETWORK LAYER 3 Routing and addressing functions – correct destinations Receives incoming packets of data IP – IP addresses Routing – decides what route to use Routing – decides what route to use Forwarding – sends on packets to other hosts Forwarding – sends on packets to other hosts Controls communication subnet – layers 1-3 Controls communication subnet – layers 1-3

Unit27-networking DATA LINK LAYER 2 Organisation of data bits into frame structure Organisation of data bits into frame structure MAC Addresses (NICs) – identify devices MAC Addresses (NICs) – identify devices NICs, Switches, WAN Technologies The beginning and end of the data frame The beginning and end of the data frame The address of the sender The address of the sender The address of the receiver The address of the receiver Error checking of the data frame Error checking of the data frame

Unit27-networking PHYSICAL LAYER 1 Transmits / receives data bits as electrical pulses Controls physical link between communicating systems Describes network topology Describes network topology Transmission media – cabling / broadcasting / wireless Transmission media – cabling / broadcasting / wireless Modems – encoding binary bit of data Modems – encoding binary bit of data Electrical or optical (fibre optic) signalling Electrical or optical (fibre optic) signalling

Unit27-networking TCP / IP Basic communication protocol of the Internet TRANSMISSION CONTROL PROTOCOL TRANSMISSION CONTROL PROTOCOL Manages assembly of messages / files into smaller packets. Reassembles packets when received (OSI layer 4) INTERNET PROTOCOL INTERNET PROTOCOL Handles the address part of the packet Ensures reaches correct destination (OSI layer 3)

Unit27-networking TCP / IP (4 Layer)

Unit27-networking TCP / IP Protocols OSI LAYERSTCP LAYERSPROTOCOLS Application FTP Telnet HTTP POP3 SMTP TFTP HTTPS Presentation SessionDNS Transport TCP UDP NetworkInternetIP ICMP OSPF EIGRP BGP RIP HSRP DHCP Data LinkData Flow or Network Access layerARP RARP Physical