Osi 7 Layer

In: Computers and Technology

Submitted By supakron
Words 971
Pages 4
1 OSI 7 Layer
( Mr.Watt ) ( Mr.Mast ) ( Mr.Jodoi )
Network Certificate Layers Network 1. Why Network ? network. ( Why Network ? ) CCNA , CCNP , LPI , Security + , CWNA OSI 7 Layers CCIE OSI 7

Network ? share data ,



flash drive

network msn file Share file Server

Internet software



netwok network network OSI 7 Layers OSI 7 Layers Internet



OSI OSI Open System Interconnection OSI Model 7


OSI model 1.Physical Layer 2.Data Link Layer 3.Network Layer 4.Transport Layer 5.Session Layer 6.Presentation Layer 7.Application Layer

OSI 7 Layers











Data Link

Data Link



Layer 1.Physical Layer
Physical Layer Connector layer bits protocol CAT5, CAT6, RJ-45 cable Lan







1. Router -

Lan Lan Lan ( Crossover ) PC Lan PC , Router ( Straight ) PC Hub Switch






2.Data Link Layer
Data Link Layer MAC Address ATM , MPLS Data Link Layer CCNA encapsulation encapsulation encapsulation frame decapsulation encapsulation layer Frame address protocol

Ethernet , Token Ring , IEEE 802.3/202.2 , Frame Relay, FDDI,HDLC,

2 LAN VLAN Switch Trunk port encapsulation encapsulation VLAN config Trunk port cisco Switch encapsulation Port


WAN Mac Address Table , Switch Switch 2 IEEE 802.1Q ISL Switch


WAN Router Cisco ) encapsulation

encapsulation Media encapsulation ppp ( Leased line hdlc ( encapsulation

Media encapsulation Router encapsulation default

Media Provider set Router Cisco )

Leased line



encapsulation router ietf 2 cisco

set )

Router Cisco encapsulation Router


Similar Documents

Osi Layers

...OSI LAYERS The Open Systems Interconnection (OSI) divides the network processes into layers. The OSI model takes a task and divides it into a series of activities which are each defined and developed individually. In ascending order those layers are: Application, Presentation, Session, Transport, Network, Data-Link, and Physical. (Hillpot & Ivy, 2005) 7 | Application | 6 | Presentation | 5 | Session | 4 | Transport | 3 | Network | 2 | Data-Link | 1 | Physical | The Application layer provides services to software which requires a network. An example would be Internet browsers, and email. The Presentation layer handles data representation and code formatting. Data encryption and compression occur in this layer. The Session layer establishes, manages, and terminates sessions between applications. The Transport layer assembles data, transmits data segments, and disassembly before and after transmission. The Network layer is where routing occurs, this layer defines the process used to route data across a network. The Data-Link layer deals with the links and mechanisms used to move data on the network. This layer is divided into two sublayers the LLC and the MAC. The LLC sublayer controls frame synchronization, flow control and error checking. The MAC (Media Access Control) sublayer moves data packets to and from Network Interface Cards on a shared channel. The Physical layer deals with the physical characteristics of the transmission......

Words: 303 - Pages: 2

Osi Model

...This paper will discuss the Open System Interconnections (OSI). “The OSI was developed by the international Organization for Standardization (ISO) as a Model for a computer protocol architecture and as a framework for developing protocol standards. The OSI model consists of seven Layers: Application, Presentation, Session, Transport, Network, Data Link, and Physical.” (University of Phoenix) The Application layer supports application and end user processes, also it provides application services for file transfer, e-mail, and other network software service. Telnet and FTP are applications that exist completely in the application level. The Presentation layer provides self-rule from differences in data representation by translating from application to network format and vice versa. This layer works to convert data into the form that the application layer can accept. It formats and encrypts data to be sent across a network, providing lack of restrictions from compatibility problem. The Session layer launch manages and come to an end connection between applications. This layer sets up, brings together, and terminates conversations, exchanges, and dialogues between the applications at each end. The Transport layer provides crystal clear transfer of data between end systems, or hosts, and is responsible for end to end error recovery and flow control. This layer guarantee complete data transfer. The Network layer offers switching and routing technologies, creating logical......

Words: 483 - Pages: 2

Osi Model

...Describe the OSI Model and how it relates to a network. The OSI Reference Model is becoming more popular everyday because it is a useful tool for learning about networks. The OSI Reference Model is where the communication system (network) is broken down into seven layers, where each layer serves a purpose. The OSI Reference Model defines what each layer’s function is but does not specify actual services in the layers. So that the vendors can write device drivers for a device; and not be concerned about the higher layers, this speeds up the process. The seven layers are divided into three groups: 1) Application (upper) layer, 2) Intermediate layer, 3) and Network oriented (lower) layer. With this system the OSI Reference Model is convenient because you’re able to communicate with a different computer network. The WAN Network operates on the Physical and data link layer of the OSI Reference Model. What are some Protocols? The purpose of the OSI Reference Model is to determine how data should be transmitted between two points in a network. Its job is to consistently work with other products. On which layer do switches and routers operate? Layer two, three, and four the Presentation layer, Session, and Transport Layer is where the witches and routers will operate. If Routers operate on more than one layer, what is the difference? Routers operate on layer three then apply on layer two and the switch the packets. Layer two would be Ethernet and layer three is the......

Words: 254 - Pages: 2

Osi Model

...OSI Model Your Name University of Phoenix Introduction to WAN technologies  Teacher Date “The OSI (Open Systems Interconnection) model was created by the ISO to help standardize communication between computer systems.” (Tech Terms, 2011) The OSI model has seven different layers which breaks up communications and uses multiple hardware standards, protocols and even other types of services. The seven layers of this protocol are the physical layer, data link layer, network layer, transport layer, session layer, presentation layer and the application layer. The layers which WAN protocols operate are at Layer 1 and Layer 2 which are the physical layer and the data link layer. You have the cables, routers, server, connectors, signaling and standards on the first layer and then you have the frame relay, HDKX, PPP and ATM which are the WAN protocols on the second layer. “The physical layer is responsible for establishing, maintaining and ending physical connections (point to point) between computers.” (University of Pittsburg) When you talk about routers on different levels in the OSI protocols a thing to remember is they can be doing processes on more than one level but they really only reside on the first level of the protocol. Layer 1 is actually concerned with the interpretation of the bit stream and turning it into an electrical signal that will be carried across a physical medium. Then the data link layer or layer 2 will really define the format of the data ion the......

Words: 354 - Pages: 2

Osi Model

...OSI MODEL Joseph Lucero College America Abstract In this paper it is going to explain the OSI model and all the layers. There are 7 layers in total: the layers are Application, Presentation, Session, Transport, Network, Data Link and Physical. It is going to explain what all the layers are and how they work in the OSI Model, it is also going to explain what every layer is. It is also going to explain why it was created and what the use for the OSI model is for today. You are going to know why we need the OSI model and how it evolved from the first time. You are also going to find out about the past history about the model and the other name is what called before. OSI Model The OSI model has been used for a long time. Why do we use it? OSI, formally known as the ISO OSI model, is the most standard model for networking communication. The ISO formed the OSI or Open System Interconnection, so that you can communicate and connect with another system over the network without having system specific configuration. The OSI model consists of 7 different layers: Physical, Data Link, Network, Transport, Sessions, Presentation, and Application. One reason why the OSI model was created, is so that the process of communication that were between two end points in a telecommunication network can be split into layers. The main reason why the OSI Model was created was to standardize the networking rules so that all the systems can communicate over the OSI reference model, which was a...

Words: 954 - Pages: 4

Osi Model

...OSI Ned Leeds CMGT/245 CMGT/245 Version 2 IS Security Concepts October 28, 2013 LAYER 1 - PHYSICAL  The physical layer is mainly responsible for establishing, maintaining and ending physical connections (point to point) between computers. This layer is concerned with the actual interpretation of the bit stream into an electrical signal that can be carried across a physical medium. The protocols at this layer deal with the binary transmission, voltage levels, and data rates. This layer would also specify physical medium properties such as cables and network cards. LAYER 2 - DATA LINK The data link layer defines the format of data on the network. All of the data sent through the network are made into a frame which is performed at this level. The frame is a uniform way of sending the data along with address information and error checking capabilities. CRC is used for the error detection at this level. The receiving end the CRC fails at this level there is a request back to the sender for retransmission of this packet. LAYER 3 - NETWORK The network layer basically handles all of the addressing issues. This layer addresses packets, determines the best path or route will manages network problems such as data congestion. There are three ways in which the packets are routed to their destinations. There could be a static route through the entire network that will never be changed. This could also be a static line only used during a particular session between the......

Words: 1130 - Pages: 5

Seven Layers of the Osi

...The Seven Layers of the OSI Model The OSI is an open networking model developed by ISO over the same time frame as TCP/IP. The Open Systems Interconnection (OSI) model has seven layers. The layers are stacked beginning with the 'lowest' (the physical) and proceeding to the 'highest' (the application). A layer serves the layer above it and is served by the layer below it. PHYSICAL LAYER The physical layer, the lowest layer of the OSI model, provides the path through which data moves among devices on the network (it specifies how a device sends and receives). Other functions of the physical layer include the conversion of signals into something that another layer can use (referred to as a bit), and adjusting the signal to allow for multiple users to use the same connection. The physical layer receives data from the data link layer, and transmits it to the wire. DATA LINK LAYER Layer two of the OSI model is the Data Link which provides a system through which network devices can share the communication channel. The data link layer provides error-free transfer of data frames from one node to another over the physical layer, allowing layers above it to assume virtually error-free transmission over the data. NETWORK LAYER Layer three, the network layer controls the operation of the subnet, deciding which physical path the data should take based on network conditions, priority of service, and other factors. This layer also handles aspects of Routing Protocols, finding......

Words: 618 - Pages: 3

Open System Interconnection 7 - Layer Reference Model

...OSI Model Open System Interconnection แบบจำลองเครือข่าย ( Network Model ) เสนอ อาจารย์ ปริญญา น้อยดอนไพร จัดทำโดย 1. นางสาวกนกอร ไกรนรา รหัสนักศึกษา 5240410501 2. นางสาวกมลชนก บัวหยาด รหัสนักศึกษา 5240410502 1. จุฑามาศ ฤทธิมนตรี 5240410516 3. นางสาวจุฑามาศ ฤทธิมนตรี รหัสนักศึกษา 5240410516 4. นายเชาวนัส นวลรัตน์ รหัสนักศึกษา 5240410521 5. นายทิชากร ศรีอาวุธ รหัสนักศึกษา 5240410530 6. นางสาวปิยะธิดา ศรีส่วน รหัสนักศึกษา 5240410549 7. นายวราพล แช่ตั้ง รหัสนักศึกษา 5240410565 8. นางสาววินิตา เพชรทอง รหัสนักศึกษา 5240410569 9. นางสาว สิริมา เพชรรัตน์ รหัสนักศึกษา 5240410578 10. นางสาวสุชากรณ์ หนูชู รหัสนักศึกษา 5240410579 8. จุฑามาศ ฤทธิมนตรี 5240410516 9. สุชากรณ์ หนูชู 5240410579 10. จุฑามาศ ฤทธิมนตรี 5240410516 11. สุชากรณ์ หนูชู 5240410579 รายงานฉบับนี้เป็นส่วนหนึ่งของรายวิชา 928-202 การสื่อสารข้อมูลและเครือข่าย มหาวิทยาลัยสงลานครินทร์ วิทยาเขตสุราษฎร์ธานี ภาคการศึกษาที่ 2 ปีการศึกษา 2553 คำนำ ในโลกปัจจุบัน คอมพิวเตอร์ ได้ก้าวเข้ามามีบทบาทในชีวิตประจำวันอย่างกว้างขวาง ทั้งในส่วนของการใช้งานโดยตรง เช่น การใช้ในองค์กรธุรกิจต่าง ๆ การควบคุมระบบการเจรจาทั้งทางบก ทางน้ำ และทางอากาศ การติดต่อสื่อสารแลกเปลี่ยนข้อมูลทั้งในระยะใกล้ไปจนถึงระยะไกล ข้ามโลก รวมไปถึงการใช้ในด้านความบันเทิงทั้งเกมส์คอมพิวเตอร์หรือภาพยน ตร์ที่สร้างด้วยคอมพิวเตอร์กราฟิก เป็นต้น ดังนั้น กลุ่มของข้าพเจ้าจึงได้จัดทำรายงาน...

Words: 686 - Pages: 3

Osi Layer in Malaysia

...Papers The OSI Model: Understanding the Seven Layers of Computer Networks 1-800-COURSES www.globalknowledge.com The OSI Model: Understanding the Seven Layers of Computer Networks Paul Simoneau, Global Knowledge Course Director, Network+, CCNA, CTP Introduction The Open Systems Interconnection (OSI) model is a reference tool for understanding data communications between any two networked systems. It divides the communications processes into seven layers. Each layer both performs specific functions to support the layers above it and offers services to the layers below it. The three lowest layers focus on passing traffic through the network to an end system. The top four layers come into play in the end system to complete the process. This white paper will provide you with an understanding of each of the seven layers, including their functions and their relationships to each other. This will provide you with an overview of the network process, which can then act as a framework for understanding the details of computer networking. Since the discussion of networking often includes talk of “extra layers”, this paper will address these unofficial layers as well. Finally, this paper will draw comparisons between the theoretical OSI model and the functional TCP/IP model. Although TCP/IP has been used for network communications before the adoption of the OSI model, it supports the same functions and features in a differently layered arrangement. An Overview of the OSI......

Words: 2594 - Pages: 11

Application Layer

...engineering, the whole networking concept is divided into multiple layers. Each layer is involved in some particular task and is independent of all other layers. But as a whole the almost all networking task depends on all of these layers. Layers share data between them and they depend on each other only to take input and give output. In layered architecture of Network Models, one whole network process is divided into small tasks. Each small task is then assigned to a particular layer which works dedicatedly to process the task only. Every layer does only specific work. I have chooses application layer from the OSI model because the world experiences the Internet through the use of the World Wide Web, e-mail, and file-sharing programs. These applications, as well as others, provide the human interface to the underlying network, allowing you to send and receive information with relative ease. Most of the applications are intuitive; they can be accessed and used without the need to know how they work. As we continue to study the world of networking, it becomes more important to know how an application is able to format, transmit, and interpret messages that are sent and received across the network. INTRODUCTION Application layer is the highest most layers in OSI and TCP/IP layered model and this layer exists in both layered Models because of its significance which is interacting with user and user applications. This layer is for applications which are involved in communication......

Words: 1147 - Pages: 5

Web Sites - the Osi Model and Layer Protocols

...Web Sites - The OSI Model and Layer Protocols NTC/362 March 9, 2015 The building of a web site begins with considering the multilayered framework of the Open System Interconnection (OSI) model or the Transmission Control Protocol/Internet Protocol (TCP/IP) model. Network models are designed to categorize all the required functionality around computer communications as well as explain the relationship and flow of information from layer to layer. These models can also be thought of as the structure for interfacing human and data networks. It is also important to think of these models existing on both ends of the networked data transmission. The end to end process can be viewed as a six step process. In step 1 people create the communication. Step 2 the application layer prepares human communication for transmission over the data network. Step 3 software and hardware convert communication to a digital format. Step 5 the application layer services initiate the data transfer. Step 5 model layers play a role in encapsulating data down the stack. Encapsulated data travels across the media to the destination. Model layers then unencapsulate the data up the stack. Lastly in step 6 the application layer receives the data from the network and prepares it for human use. The seven layers of the OSI model are 1-Physical, 2-Dat Link, 3-Network, 4-Transport, 5-Session, 6-Presentation, and 7-Application. The TCP/IP model is a four layer model. The layers of the TCP/IP......

Words: 1366 - Pages: 6

Osi Seven Layer Model

...OSI Seven Layer Model The Open System Interconnection model (OSI) defines internetworking in terms of a vertical stack of seven layers. The upper layers of the OSI model represent software that implements network services like encryption and connection management. The lower layers of the OSI model implement more primitive, hardware-oriented functions like routing, addressing, and flow control(Mitchell, 2011).The seven layers of the OSI model are - * Physical * DataLink * Network * Transport * Session * Presentation * Application Physical Layer is the first layer of the OSI model and deals with the physical aspects of the media being used to transmit the data. This layer is also responsible for bit-level transmission between network nodes. Specification examples include Ethernet, 802.3, 802.5, and Fiber Distributed Data Interface. Data Link Layer is the second layer of the OSI model and is responsible for ensuring there are data link connections between two network entities so that data can get across a specific medium and individual links. Examples of this layer include IEEE 802.3, IEEE 802.5, Token Ring, and Frame Relay. Network Layer is the third layer of the OSI model and is responsible for the packet sequencing, congestion control, and error handling. This layer also provides paths for data to transfer through the network. At the Network layer routers began to operate. Examples of this layer include the use of Internetwork Protocol......

Words: 596 - Pages: 3

Osi Model and Tcp/Ip Model

...following table compares the functions performed at each OSI model layer. Layer | Description and Keywords | Application (Layer 7) | The Application layer integrates network functionality into the host operating system, and enables network services. The Application layer does not include specific applications that provide services, but rather provides the capability for services to operate on the network.Most Application layer protocols operate at multiple layers down to the Session and even Transport layers. However, they are classified as Application layer protocols because they start at the Application layer (the Application layer is the highest layer where they operate). Services typically associated with the Application layer include: * HTTP * Telnet * FTP * TFTP * SNMP | Presentation (Layer 6) | The Presentation layer formats or "presents" data into a compatible form for receipt by the Application layer or the destination system. Specifically, the Presentation layer ensures: * Formatting and translation of data between systems. * Negotiation of data transfer syntax between systems, through converting character sets to the correct format. * Encapsulation of data into message envelopes by encryption and compression. * Restoration of data by decryption and decompression. | Session (Layer 5) | The Session layer's primary function is managing the sessions in which data is transferred. Functions at this layer include: * Management of multiple......

Words: 836 - Pages: 4

Re: Osi Models Layer

...Prentice Hall™ is a trademark of Pearson Education, Inc. All other tradmarks or product names are the property of their respective owners. The author and publisher of this book have used their best efforts in preparing this book.These efforts include the development, research, and testing of the theories and programs to determine their effectiveness.The author and publisher make no warranty of any kind, expressed or implied, with regard to these programs or the documentation contained in this book.The author and publisher shall not be liable in any event for incidental or consequential damages in connection with, or arising out of, the furnishing, performance, or use of these programs. Printed in the United States of America 10 9 8 7 6 5 4 3 2 1 ISBN: 0-13-243310-9 Pearson Education Ltd., London Pearson Education Australia Pty. Ltd., Sydney Pearson Education Singapore, Pte. Ltd. Pearson Education North Asia Ltd., Hong Kong Pearson Education Canada, Inc., Toronto Pearson Educaci n de Mexico, S.A. de C.V. Pearson Education Japan, Tokyo Pearson Education Malaysia, Pte. Ltd. Pearson Education, Inc., Upper Saddle River, New Jersey For my scintillating wife ATS WEB SITE FOR DATA AND COMPUTER COMMUNICATIONS, EIGHTH EDITION The Web site at WilliamStallings.com/DCC/DCC8e.html provides support for instructors and students using the book. It includes the following elements. Course Support Materials The course support materials include • Copies of......

Words: 317095 - Pages: 1269

Osi Levels

...THE OSI REFERENCE MODEL The concept of how a modern day network operates can be understood by dissecting it into seven layers. This seven layer model is known as the OSI Reference Model and defines how the vast majority of the digital networks on earth function. OSI is the acronym for Open Systems Interconnection, which was an effort formed by the International Organization for Standardization in 1982 with the goal of producing a standard reference model for the hardware and software connection of digital equipment. The important concept to realize about the OSI Reference Model is that it does not define a network standard, but rather provides guidelines for the creation of network standards. The OSI has become so accurate a concept that almost all major network standards in use today conform entirely to it's seven layer model. Though seven layers may at first appear to make a network seem overly complex, the seven layer OSI Model has been proven over the past twenty years to be the most efficient and effective way to understand this extremely complex subject. OSI LAYER 1: THE PHYSICAL LAYER The first and foundational layer of a network is the Physical Layer. The Physical Layer is literally what it's name implies: the physical infrastructure of a network. This includes the cabling or other transmission medium and the network interface hardware placed inside of computers and other devices which enable them to connect to the transmission medium. The purpose of the......

Words: 2651 - Pages: 11

Double Decker! Doug Kirill | Siti Badriah Lagi Syantik Versi Dj | Common App Essay