presentation on computer networks

An Introduction to Computer Networks - Second Edition

(6 reviews)

Peter Lars Dordal, Loyola University of Chicago

Copyright Year: 2014

Last Update: 2020

Publisher: Peter L Dordal

Language: English

Formats Available

Conditions of use.

Learn more about reviews.

Reviewed by Stuart Anderson, Adjunct Instructor, Norfolk State University on 11/13/23

The textbook is complete and thorough. The index correctly points to the material in the chapters. read more

Comprehensiveness rating: 5 see less

The textbook is complete and thorough. The index correctly points to the material in the chapters.

Content Accuracy rating: 5

The information in the book is accurate as it applies to networking concepts.

Relevance/Longevity rating: 5

The book's content is current.

Clarity rating: 4

The material is clear however, it does make assumptions about the reader's level of current knowledge about the material.

Consistency rating: 5

The material is consistent and flows in a good order.

Modularity rating: 4

The is very good in how the information is broken down into specific modules. Some modules need more information to make them more complete.

Organization/Structure/Flow rating: 5

The information is organized in a fashion that allows future topics to build on the previous topics.

Interface rating: 5

There were no interface issues.

Grammatical Errors rating: 5

There are no grammatical errors.

Cultural Relevance rating: 5

The test is inclusive of all cultures.

This is a good textbook for networking information. Some of the material could be explained in more detail to make it more of an introductory topic. A reader with networking experience would find this book a good reference, however, a reader new to the networks might find some of the material a bit light. As a network engineer, I found the information thorough and would work well with other networking material.

Reviewed by Terri Devlin, Instructor, Aims Community College on 7/23/19

Even though the title of the text is "An Introduction to Networking", the author seems to assume that the student or reader knows a lot about the subject matter and terminology. Topics and some definitions are presented, however the author does a... read more

Comprehensiveness rating: 3 see less

Even though the title of the text is "An Introduction to Networking", the author seems to assume that the student or reader knows a lot about the subject matter and terminology. Topics and some definitions are presented, however the author does a deep dive into the topic area quickly. This text would not be beneficial to students seeking CompTia Network + Certification because many of the terms and concepts tested in the certification exam are not covered in this text.

The author presents the material in an unbiased manner. Errors were not identified

Relevance/Longevity rating: 2

Out-of-date information was identified. The text is written in a manner that updates could be made in a straightforward manner.

Clarity rating: 2

The text was difficult to read because precise definitions and content were not provided. Other textbooks and internet sources were used to look up definitions and refresh understanding of technical terms and concepts

Consistency rating: 4

The terminology, framework, and chapter exercises followed a consistent approach.

The layout of the book is easy to understand and follow.

Organization/Structure/Flow rating: 3

The topics were organized in a logical fashion. It was a challenge to determine the network “big picture” and how the components fit into the picture. The topics make sense to people familiar with Networks. This text would be challenging to people new to Computer Network concepts.

Interface rating: 3

The text is free of navigation problems. The figures and tables were easily identified. An improvement could be made with providing better images or pictures.

Grammatical Errors rating: 4

The text was free of grammatical errors.

The text is appropriate for globally-based students.

Many computer concept textbooks have associated software that helps student learn topics and practice. Computer Networks is an area where practice helps students learn. This text did not have associated software available.

Reviewed by Audrey Styer, Instructor, CIS/CPS, Morton College on 12/21/18

This textbook provides a very comprehensive and in-depth introduction to computer networking. read more

This textbook provides a very comprehensive and in-depth introduction to computer networking.

All information presented is accurate.

This textbook is continually being updated to accommodate the ever-changing nature of computer networking.

Clarity rating: 5

Material is presented in a clear manner, but does require a prior basic understanding of computer networking.

Consistency of presentation and methodology is maintained throughout the text.

Modularity rating: 5

The chapters are well defined by topic

The material is presented in a logical manner that helps learners develop their understanding.

The PDF version is easy to read and navigate. The linked Table of Contents and Index make finding and moving to specific topics simple.

I found no grammatical errors.

This is not applicable to this topic.

The callout boxes provide a visual break for readers and increase learning with interesting facts and supporting information. Unfortunately, this textbook is too advanced for my undergraduate learners and does not map to CompTIA’s Network+ certification.

Reviewed by Sunho Lim, Assistant Professor, Texas Tech University on 3/27/18

The text covers all five layers (phy, link, net, trans, and app) and their associated algorithms and communication protocols in the network, and provides an effective index and/or golssary. read more

The text covers all five layers (phy, link, net, trans, and app) and their associated algorithms and communication protocols in the network, and provides an effective index and/or golssary.

The content is accurate and unbiased.

Relevance/Longevity rating: 3

The most content is up-to-date and the text is written in a way to easily be updated. Since network technology is time-sensitive, some sections in the text should be updated.

The text is easy to read but some advanced sections (e.g., network simulator ns-2 and ns-3) would be challenging to read and understand technical terminology used.

The text is consistent in using terminology and framework.

The text is well divided into a set of sections. It is easy to selectively choose a section depending on the level of class or students.

Organization/Structure/Flow rating: 4

The topics in the text are presented in a bottom-up way, but grouping sections in terms of layer would be great.

The text has an interface issue, such as some contents are displayed out of page or cut off.

The text contains no grammatical errors.

Cultural Relevance rating: 1

The text is not related to any culture.

The text is appropriate to both undergraduate to graduate students. A set of selective chapters can be used depending on the instructor. The text is good to use for a reference book.

Reviewed by Lisa Bain, Professor, Rhode Island College on 2/1/18

The book covers all the major topics required for a computer networking course. read more

The book covers all the major topics required for a computer networking course.

Yes, this book is accurate in the major areas that the reviewer read. The entire text was not reviewed.

Relevance/Longevity rating: 4

Yes, the book is up-to-date with the major concepts that do not change (e.g. TCP, IP, UDP) and also includes the latest standards for Wi-Fi. However, some networking technologies will need to be updated as advancements are made (e.g. newer Wi-Fi standards).

Yes, the text is clearly written. However, the content is very technical and would be challenging for a non-technical person to understand all aspects. It is very straight-forward and appropriate for a technical audience.

Yes, the book is consistent and uses the same technical terminology throughout.

Yes the book is very modular and provides many small sections within each chapter for specific topics.

The flow of the book is similar to other networking books in that is starts with an introduction then provides additional details in following chapters.

The interface in PDF is easy to navigate using the table of contents and embedded links.

Of the information read, no grammar errors were found.

This is not relative to this book.

This book would be appropriate for an instructor with a strong background in teaching networking and using a more technical approach.

Reviewed by Luke Osterritter, Adjunct Instructor, Penn State New Kensington on 2/1/18

This text does a great job of covering the basics of computer networks while also presenting in-depth information, as well as diving into some somewhat tangential, but important, areas (e.g. security). read more

This text does a great job of covering the basics of computer networks while also presenting in-depth information, as well as diving into some somewhat tangential, but important, areas (e.g. security).

There are some terms here that I have seen presented differently than I have learned them or encountered in industry, but nothing inaccurate.

It would seem that this book is kept rather up-to-date, though much of the content is so fundamental as to not have too much of an expiration date, even in this field.

I believe the text is clear in most cases. However, I do feel many of the topics become very in-depth, very fast. It would be nice to have some concepts factored out to their basics early in the chapters, then expounded upon later.

The text does not appear to have any major inconsistencies.

When viewing online, the table of contents makes the content very browsable. However, when viewing in PDF, the large amount of subheadings for any one chapter can be a bit tough to navigate.

As the author notes, there isn't much agreement in how to present this topic, and it can be very difficult to explain one portion without referencing another topic that may not have been presented. I think factoring out some basics and explaining them up front, as this book has done, is a clever way of handling this.

I did not encounter any issues with the text interface.

I did not see any obvious grammatical errors.

This book is very matter-of-fact, with little in the way of irreverence. Likewise, there isn't much to work with here to be proactively inclusive. I think it works to be somewhat inert in this manner.

Overall, I think that this book is a great resource to have given its open availability. It's not the simplest book, so using this in a first level class or in a more general IT, CS, or survey course will take some shepherding on the part of the instructor. The comprehensiveness does suggest to me that this might be able to fill two courses worth of content, as well. It would be nice to have some of the information factored out, with some of the highlights available as lecture materials. On its own though, I feel this would be a strong resource to use in a computer networking course.

Table of Contents

• 1 An Overview of Networks
• 3 Other LANs
• 6 Abstract Sliding Windows
• 7 IP version 4
• 8 IP version 6
• 9 Routing-Update Algorithms
• 10 Large-Scale IP Routing
• 11 UDP Transport
• 12 TCP Transport
• 13 TCP Reno and Congestion Management
• 14 Dynamics of TCP Reno
• 15 Newer TCP Implementations
• 16 Network Simulations: ns-2
• 17 The ns-3 Network Simulator
• 19 Queuing and Scheduling
• 20 Quality of Service
• 21 Network Management and SNMP
• 22 Security
• 23 Bibliography
• 24 Selected Solutions

Ancillary Material

• Peter L Dordal

About the Book

An Introduction to Computer Networks is a free and open general-purpose computer-networking textbook, complete with diagrams and exercises.It covers the LAN, internetworking and transport layers, focusing primarily on TCP/IP. Particular attention is paid to congestion; other special topics include queuing, real-time traffic, network management, security and the ns simulator.

The book is suitable as the primary text for an undergraduate or introductory graduate course in computer networking, as a supplemental text for a wide variety of network-related courses, and as a reference work.

About the Contributors

Peter Lars Dordal is an associate professor within the Department of Computer Science at Loyola University of Chicago. His research interests are in programming languages and computer networks.

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Computers and the Internet

Course: computers and the internet   >   unit 3, computer networks.

• Wires, cables, and WiFi
• Physical network connections
• Bit rate, bandwidth, and latency
• Bit rate and bandwidth

Building a network

• The ring topology looks like a circle of connected devices, where each device is connected to two neighbors (one on either side).
• The mesh topology looks like a circle with lines inside it, showing that every device is connected to every other device.
• The star topology has a device at the center and then a connection between that center device and the other five devices.
• The bus topology shows a center line with connections coming off the line for each device. No device is directly connected to another device, but they are all connected via the central line.
• The tree topology starts with a single device at the top which branches to connect with two more devices. The left child device branches to connect with two more devices, while the right child only has one branch connecting it to a child device. There are three layers to the tree.

Types of networks

• (Choice A)   DCN A DCN
• (Choice B)   WAN B WAN
• (Choice C)   LAN C LAN

Networking protocols

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• An Introduction to Computer Networks »

An Introduction to Computer Networks ¶

Welcome to the website for An Introduction to Computer Networks , a free and open general-purpose computer-networking textbook, complete with diagrams and exercises. It covers the LAN, internetworking and transport layers, focusing primarily on TCP/IP. Particular attention is paid to congestion; other special topics include queuing, real-time traffic, network management, security, mininet and the ns simulator.

The book is suitable as the primary text for an undergraduate or introductory graduate course in computer networking, as a supplemental text for a wide variety of network-related courses, and as a reference work.

It is released under the Creative Commons license Attribution-NonCommercial-NoDerivs , though note that some commercial use is allowed (see the preface for licensing details).

Further information about classroom use is available in the preface .

As of the end of July 2020 I am pleased to introduce the second edition . The first version of the second edition, 2.0.1, is essentially identical to the final release of the first edition, 1.9.21, except that the chapters have been divided into more manageable size; see the discussion in the preface for more. Here are the versions for the second edition:

• Second Edition online html , starting at the Table of Contents
• Second Edition pdf
• unicode-safer online html (if these characters do not display properly: ⟨𝛼,𝛽,𝛾,⟩)
• mobile version (experimental; works reasonably well on Android and iPhones)
• Zipped html
• unicode-safer zipped html
• epub (warning: not compatible with some epub readers)

The last version of the first edition , 1.9.21, is available in the following forms:

• Online html
• unicode-safer online html
• mobile version

A comment form is now available. Let me know what you think!

In the html versions the per-chapter table-of-contents sidebar is now collapsible, for better use of screen space on smaller devices. Unfortunately, this has broken the search feature. Repairs are underway, but progress has been slow.

See the preface for more information on the unicode issues that have led to the unicode-safer versions above.

Edition 1.0 of the book is permanently available as Online html , Zipped html , pdf and epub although most users are more likely to want the current version above.

Peter Dordal

Introduction to Computer Network

Nov 06, 2019

380 likes | 551 Views

Introduction to Computer Network. Dr. Rania R Ziedan. Agenda. Introduction Network types Network topology Network connection models OSI model. Computer network. A collection of computing devices that are connected in various ways in order to communicate and share resources or files

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• client server
• physical topology
• client server model
• fully connected mesh network

Presentation Transcript

Introduction to Computer Network Dr. Rania R Ziedan

Agenda • Introduction • Network types • Network topology • Network connection models • OSI model

Computer network • A collection of computing devices that are connected in various ways in order to communicate and share resources or files • Wired network: the connections between computers in a network are made using physical wires or cables • Wireless network: the connections between computers in a network are made using radio waves or infrared signals

Computer network • Each computer in the network is known as: node or host • Data transfer rate: is the speed with which data is moved from one place on a network to another, which is a key feature in computer networks

Network Types • Local Area Network (LAN): two or more computers connected together, the computers are physically near each other (for example: in the same building) • LANs are inexpensive to install • LANs provide higher speeds

Network Types • Metropolitan Area Network (MAN): usually span tens of kilometers (for example: in the same city) • The cost of installation and operation is higher. • MANs use high-speed connections such as fiber optics to achieve higher speeds

Network Types • Wide Area Network (WAN): is a connection of LANs (for example : the Internet) • WANs span a larger area than a single city. • These use long distance telecommunication networks for connection, thereby increasing the cost.

The Internet • It is a large group of computers that are connected to each other and used to send information quickly between computers around the world

Physical topology of a network • The term physical topology refers to the way in which a network is laid out physically. • The topology of a network is the geometric representation of the relationship of all the links and linking devices • There are four basic topologies possible: mesh, star, bus, and ring

Physical topology of a network • Mesh Topology • In a mesh topology, every device has a dedicated point-to-point link to every other device. • The term dedicated means that the link carries traffic only between the two devices it connects. • The number of physical links in a fully connected mesh network with n nodes  n(n-1)/2 • The mesh topology used in the connection of telephone regionaloffices in which each regional office needs to be connected to every other regional office.

Physical topology of a network • Mesh Topology • Advantages: • Each link can carry its own data load, thus eliminating the traffic problems that can occur with shared links. • A mesh topology is robust. If one link becomes unusable, it does not incapacitate the entire system. • Every message travels along a dedicated line, only the intended recipient sees it. Physical boundaries prevent other users from gaining access to messages. • Point-to-point links make fault identification and fault isolation easy. Traffic can be routed to avoid links with suspected problems. • Disadvantage: • The amount of cabling and the number of I/O ports required.

Physical topology of a network • Star Topology • Each device has a dedicated point-to-point link only to a central controller, usually called a hub. • A star topology does not allow direct traffic between devices. • The controller acts as an exchange: If one device wants to send data to another, it sends the data to the controller, which then relays the data to the other connected device. • The star topology is used in local-area networks (LANs)

Physical topology of a network • Star Topology • Advantages: • less expensive than a mesh topology, each device needs only one link and one I/O port to connect it to any number of others. • Easy to install and reconfigure. • Robustness, if one link fails, only that link is affected, all other links remain active. • As long as the hub is working, it can be used to monitor link problems and bypass defective links • Disadvantage: • the dependency of the whole topology on one single point, the hub. If the hub goes down, the whole system is dead

Physical topology of a network • Bus Topology • A bus topology is multipoint connection. • One long cable acts as a backbone to link all the devices in a network. • Nodes are connected to the bus cable by drop lines and taps. • There is a limit on the number of taps a bus can support and on the distance between those taps. As a signal travels along the backbone, some of its energy is transformed into heat. Therefore, it becomes weaker and weaker as it travels farther and farther. • Bus topology was the one of the first topologies used in the design of early local area networks. • The cable has two end terminals that dampen the signal so that it does not keep moving from one end of the network to the other.

Physical topology of a network • Bus Topology • Advantages: • Ease of installation • Bus uses less cabling than mesh or star topologies. • Disadvantages: • Difficult reconnection and fault isolation. • Difficult to add new devices. • Signal reflection at the taps can cause degradation in quality. This degradation can be controlled by limiting the number and spacing of devices connected to a given length of cable. • Adding new devices may therefore require modification or replacement of the backbone. • In addition, a fault or break in the bus cable stops all transmission, even between devices on the same side of the problem. The damaged area reflects signals back in the direction of origin, creating noise in both directions.

Physical topology of a network • Ring Topology • Each device has a dedicated point-to-point connection with only the two devices on either side of it. • A signal is passed along the ring in one direction, from device to device, until it reaches its destination. • Each device in the ring incorporates a repeater. When a device receives a signal intended for another device, its repeater regenerates the bits and passes them along

Physical topology of a network • Ring Topology • Advantages: • easy to install and reconfigure • Fault isolation is simplified. • Generally in a ring, a signal is always circulating . If one device does not receive a signal within a specified period, it can issue an alarm. The alarm alerts the network operator to the problem and its location. • To add or delete a device requires changing only two connections. The only constraints are media and traffic considerations (maximum ring length and number of devices). • Disadvantages: • Unidirectional traffic • a break in the ring can disable the entire network. • This weakness can be solved by using a dual ring or a switch capable of closing off the break.

Network connection models • Networks can also be classified according to the roles that the networked computers play in the network’s operation. • Peer-to-peer, • server-based, • and client-based.

Network connection models Peer-to-peer model all computers are considered equal. Each computer controls its own information and is capable of functioning as either a client or a server depending upon the requirement. • Peer-to-peer networks are inexpensive and easy to install. • They are popular as home networks and for use in small companies. • Most operating systems come with built-in peer-to-peer networking capability. • The maximum number of peers that can operate on a peer-to-peer network is ten. • Each peer shares resources and allows others open access to them. • Shares can be document folders, printers, peripherals, and any other resource that they control on their computers.

Network connection models Peer-to-peer network

Network connection models • client-server model is a software that consists of two parts, client systems and server systems, both communicate over a computer network

Network connection models • The client-server relationship describes the relation between the client and how it makes a service request to the server, and how the server can accept these requests, process them, and return the requested information to the client

Page request How the Web Works? • WWW use classical client / server architecture • HTTP is text-based request-response protocol HTTP HTTP Server response Server running Web Server Software (IIS, Apache, etc.) Client running a Web Browser

Client/Server • There are two types of servers: • File serverA computer that stores and manages files for multiple users on a network • Web serverA computer that responds to requests for web pages (from the browser client)

Web servers and browsers • web server: software that listens for web page requests • Apache • Microsoft Internet Information Server (IIS) (part of Windows) • web browser: fetches/displays documents from web servers • Mozilla Firefox • Microsoft Internet Explorer (IE) • Apple Safari • Google Chrome • Opera

OSI Architecture The OSI 7-layer Model OSI – Open Systems Interconnection

Description of Layers • Physical Layer • Handles the transmission of raw bits over a communication link • Data Link Layer • Collects a stream of bits into a larger aggregate called a frame • Network adaptor and device drivers in OS implement the protocol in the datalink layer • Frames are actually delivered to hosts • Network Layer • Handles routing between nodes within a packet-switched network • Unit of data exchanged between nodes in this layer is called a packet The lower three layers are implemented on all network nodes

Description of Layers • Transport Layer • Implements a process-to-process channel • Unit of data exchanges in this layer is called a message • Session Layer • Provides a name space that is used to tie together the potentially different transport streams that are part of a single application • Presentation Layer • Concerned about the format of data exchanged between peers • Application Layer • Standardize common type of exchanges The transport layer and the higher layers typically run only on end-hosts and not on the intermediate switches and routers

Summary • A computer network consists of two or more computers that are connected and are able to communicate. • The basic purpose of networks is to enable effective communication, share resources, and facilitate centralized management of data. • Networks can be classified according to their geographical boundaries or their component roles. • The topology of a network is the geometric representation of the relationship of all the links and linking devices

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Qsn no. 15 is your written assignment due September and 16 is your presentation qsn due next block. Question 1 a) Explain the ethical and societal challenges one can face when using Information Technology? [10] • Intellectual property-Millions of dollars of software is illegally copied each year all over the world. This phenomenon has a great impact on the software industry in the region. Local and foreign software industries need consumers support all over the world to maintain the progress of technology. Most importantly, for the sake of growth in indigenous ICT innovation and invention, local software industries in Asia-Pacific need local support in protecting their intellectual property rights and investment • Crime-Stolen and counterfeit ATM cards are used to steal millions of dollars each year throughout the region. The anonymity of the machines makes some crimes easier and creates many new types of crimes. • Loss of privacy-Transactions are transmitted and recorded in databases at banks, hospitals, shopping complexes, and various organizations, in the public or private sector. The contents of electronic communications and databases can provide important and private information to unauthorised individuals and organizations if they are not securely guarded. • Errors-Information input into the databases is prone to human and device error. Computer programmes that process the information may contain thousands of errors. These errors can create wrong and misleading information about individuals and organizations. Information and programme errors might result in financial loss, or even the loss of lives. • Freedom of speech and press-How do the constitutional rights of individuals in terms of the freedoms of speech and press apply to electronic media? How seriously do the problems of pornography, harassment, libel, and censorship on the net affect individuals and society? What government initiatives have been used in handling this crisis? • Digital Divide-How does ICT affect local community life? The increasing use of computers has increased the 0 0 9 3 0 0 9 4 0 0 9 3 0 0 9 4 separation of rich and poor, creating a digital divide between the information haves and have-nots. What subsidies and programmes have been provided by governments of the region to address the issue? • Unemployment-The automation of work has caused creative destruction by eliminating some vocations and creating new ones. How does this affect the employment or unemployment of the work force of a nation? • Professional Ethics-How well trained and ethical are our ICT professionals in dispensing their duties? Faulty and useless systems that cause disasters and hardships to users might be built by incompetent ICT professionals. In dispensing their duties ICT professionals must demonstrate their best practices and standards as set by professional bodies for quality assurance. b) List and explain factors you would consider before buying computer hardware [10] • Warranty

Ata Ul Munim Aseel Shaikh

Neeraj Kumar

Odhiambo Thomas

Inncoent Unwujo

Computer networks are a system of interconnected computers for the purpose of sharing digital information. Two kinds of peers’ relationship are usually considered for reputation management in P2P network. One of them is direct trust relationship that the reputation is got with two peers interacting directly; the other is recommendation trust that the reputation is got by recommendation of the third party. In this paper, we presented an improved trust model based on recommended in P2P environment. In order to weight the transaction reputation and recommendation reputation, we introduced a risk value which resists the influence of false recommendation and collaborative cheating from malicious peers. The global reputation value of target peer can be calculated by using the different portions of transaction reputation, recommendation reputation and risk value Keywords: Network, LAN, Computer, operating system, wifi, connectivity,

Adewale Ademola

endris geta

International Journal for Research in Applied Science and Engineering Technology -IJRASET

IJRASET Publication

Computer networks have become increasingly everywhere. In today's world, a computer network is much more than a collected works of interconnected devices. Computer networks are a system of interconnected computers for the purpose of transferring digital information. Networking not only helps in communication the data but also to share the available resources, to share the information, to send and receive emails, to update and analyses the data to reduce the cost and so on. The computer network enables to analyze, organize and disseminate the information that is essential to profitability. This paper provides information about different types of network. In this review paper we are presenting the basic concepts of network, network architecture and network type's i.e. LAN, MAN and WAN with its advantages and disadvantages.

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Prerequisite : OSI Model

Introduction : Presentation Layer is the 6th layer in the Open System Interconnection (OSI) model. This layer is also known as Translation layer, as this layer serves as a data translator for the network. The data which this layer receives from the Application Layer is extracted and manipulated here as per the required format to transmit over the network. The main responsibility of this layer is to provide or define the data format and encryption. The presentation layer is also called as Syntax layer since it is responsible for maintaining the proper syntax of the data which it either receives or transmits to other layer(s).

Functions of Presentation Layer :

The presentation layer, being the 6th layer in the OSI model, performs several types of functions, which are described below-

• Presentation layer format and encrypts data to be sent across the network.
• This layer takes care that the data is sent in such a way that the receiver will understand the information (data) and will be able to use the data efficiently and effectively.
• This layer manages the abstract data structures and allows high-level data structures (example- banking records), which are to be defined or exchanged.
• This layer carries out the encryption at the transmitter and decryption at the receiver.
• This layer carries out data compression to reduce the bandwidth of the data to be transmitted (the primary goal of data compression is to reduce the number of bits which is to be transmitted).
• This layer is responsible for interoperability (ability of computers to exchange and make use of information) between encoding methods as different computers use different encoding methods.
• This layer basically deals with the presentation part of the data.
• Presentation layer, carries out the data compression (number of bits reduction while transmission), which in return improves the data throughput.
• This layer also deals with the issues of string representation.
• The presentation layer is also responsible for integrating all the formats into a standardized format for efficient and effective communication.
• This layer encodes the message from the user-dependent format to the common format and vice-versa for communication between dissimilar systems.
• This layer deals with the syntax and semantics of the messages.
• This layer also ensures that the messages which are to be presented to the upper as well as the lower layer should be standardized as well as in an accurate format too.
• Presentation layer is also responsible for translation, formatting, and delivery of information for processing or display.
• This layer also performs serialization (process of translating a data structure or an object into a format that can be stored or transmitted easily).

Features of Presentation Layer in the OSI model: Presentation layer, being the 6th layer in the OSI model, plays a vital role while communication is taking place between two devices in a network.

List of features which are provided by the presentation layer are:

• Presentation layer could apply certain sophisticated compression techniques, so fewer bytes of data are required to represent the information when it is sent over the network.
• If two or more devices are communicating over an encrypted connection, then this presentation layer is responsible for adding encryption on the sender’s end as well as the decoding the encryption on the receiver’s end so that it can represent the application layer with unencrypted, readable data.
• This layer formats and encrypts data to be sent over a network, providing freedom from compatibility problems.
• This presentation layer also negotiates the Transfer Syntax.
• This presentation layer is also responsible for compressing data it receives from the application layer before delivering it to the session layer (which is the 5th layer in the OSI model) and thus improves the speed as well as the efficiency of communication by minimizing the amount of the data to be transferred.

Working of Presentation Layer in the OSI model : Presentation layer in the OSI model, as a translator, converts the data sent by the application layer of the transmitting node into an acceptable and compatible data format based on the applicable network protocol and architecture.  Upon arrival at the receiving computer, the presentation layer translates data into an acceptable format usable by the application layer. Basically, in other words, this layer takes care of any issues occurring when transmitted data must be viewed in a format different from the original format. Being the functional part of the OSI mode, the presentation layer performs a multitude (large number of) data conversion algorithms and character translation functions. Mainly, this layer is responsible for managing two network characteristics: protocol (set of rules) and architecture.

Presentation Layer Protocols : Presentation layer being the 6th layer, but the most important layer in the OSI model performs several types of functionalities, which makes sure that data which is being transferred or received should be accurate or clear to all the devices which are there in a closed network. Presentation Layer, for performing translations or other specified functions, needs to use certain protocols which are defined below –

• Apple Filing Protocol (AFP): Apple Filing Protocol is the proprietary network protocol (communications protocol) that offers services to macOS or the classic macOS. This is basically the network file control protocol specifically designed for Mac-based platforms.
• Lightweight Presentation Protocol (LPP): Lightweight Presentation Protocol is that protocol which is used to provide ISO presentation services on the top of TCP/IP based protocol stacks.
• NetWare Core Protocol (NCP): NetWare Core Protocol is the network protocol which is used to access file, print, directory, clock synchronization, messaging, remote command execution and other network service functions.
• Network Data Representation (NDR): Network Data Representation is basically the implementation of the presentation layer in the OSI model, which provides or defines various primitive data types, constructed data types and also several types of data representations.
• External Data Representation (XDR): External Data Representation (XDR) is the standard for the description and encoding of data. It is useful for transferring data between computer architectures and has been used to communicate data between very diverse machines. Converting from local representation to XDR is called encoding, whereas converting XDR into local representation is called decoding.
• Secure Socket Layer (SSL): The Secure Socket Layer protocol provides security to the data that is being transferred between the web browser and the server. SSL encrypts the link between a web server and a browser, which ensures that all data passed between them remains private and free from attacks.

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