To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser. Academia.edu uses cookies to personalize content, tailor ads and improve the user experience. Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. NETWORKS NETWORKS Introduction to Computer Networks A network is a set of devices (often referred to as nodes) connected by communication links. . A client is a computer that request services from a server computer. . . They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. other computer is available. PPP: Introduction q Point-to-point Protocol q Originally for User-network connection q Now being used for router-router connection also q PPP is used when you connect to an internet service provider (ISP) via modem q PPP is a variation of HDLC q Uses flags like HDLC q Uses byte stuffing in stead of bit stuffing # . - Sensor Networks to Monitor Elderly Yusuf Albayram Computer Science & Engineering University of Connecticut, Storrs yusuf.albayram@uconn.edu Introduction The ... - Introduction to Neural Networks & Neural Computation Canturk Isci & Hidekazu Oki Spring 2002 - ELE580B Presentation Overview Biological Neurons Artificial Neuron ... unique ICANN-overseen IP number for duration of, ability to exchange general Internet traffic, Computer Network - A collection of computing, Usually, the connections between computers in a, However, some connections are wireless, using, The generic term node or host refers to any, Data transfer rate The speed with which data is, Data transfer rate is a key issue in computer, Computer networks have opened up an entire, File server A computer that stores and manages, Web server A computer dedicated to responding to, A LAN connects network devices over a relatively, A networked office building, school, or home, In addition to operating in a limited space, LANs, LANs are confined to a relatively small area such, LANs usually have one computer designated as the, Other computers are connected to the network by, Wireless networks use high frequency radio, MAN - The communication infrastructures that have, A MAN is a large computer network that usually, A MAN usually interconnects a number of local, Wide-area network (WAN) A network that connects, Often one particular node on a LAN is set up to. • IP is a standard that defines the manner in which the network layers of two hosts interact. . - An Introduction The end of computing is not numbers but insight. - Introduction to Information and Computer Science Security Lecture c This material (Comp4_Unit8c) was developed by Oregon Health and Science University, funded by the ... - Introduction to Information and Computer Science Security Lecture a This material (Comp4_Unit8a) was developed by Oregon Health and Science University, funded by the ... - An Introduction to Computer Networks Lecture 8: Internetworking University of Tehran Dept. The two basic forms of … A system containing any combination of computers, computer terminals, printers, audio or visual display devices, or telephones … The networks in a computer are built with a great combination of software and hardware. Software The instructions that tell the computer and computer networks what to do. Software is installed inside the computer. . An Introduction to Computer Networking : In this section we will discuss what networks are, including advantages and disadvantages of using them. Course Contents of Subject ' Introduction to Computer Networks ' Physical Layer ' Data Link Layer ' Network Layer ' Transport Layer ' Application Layer 11 ' Physical (hardware)— Pen ,Pencil: this is how the letters actually get from point A to point B. ' WANs connect larger areas, such as whole states, Transoceanic cables and satellites are used to, A protocol is a set of rules that governs the, These rules include guidelines that regulate the, The physical topology of a network refers to the, Various configurations, called topologies, have, Ring topology A configuration that connects all, Star topology A configuration that centers, Bus topology All nodes are connected to a, A bus technology called Ethernet has become the, A linear bus topology consists of a main run of, A star network is designed with each node (file, A ring network is one where all workstations and, In a mesh network topology, each of the network, Every node not only sends its own signals but, This type of topology is very expensive as there, The complexity of the communication task is, Each protocol is implemented independently, Each protocol is responsible for a specific, A structured set of protocols is called a, The OSI model is now considered the primary, The OSI model describes how information or data, The OSI reference model divides the problem of, This separation into smaller more manageable, The process of breaking up the functions or tasks, Each layer provides a service to the layer above, Each layer communicates with the same layers, The lower 4 layers (transport, network, data link, Data is Encapsulated with the necessary protocol, Provides physical interface for transmission of, Defines rules by which bits are passed from one, Covers all - mechanical, electrical, functional, Such characteristics as voltage levels, timing of, Data link layer attempts to provide reliable, Handle errors by implementing an acknowledgement, Supports points-to-point as well as broadcast, Supports simplex, half-duplex or full-duplex, Implements routing of frames (packets) through, Defines the most optimum path the packet should, Defines logical addressing so that any endpoint, Facilitates interconnection between heterogeneous, The network layer also defines how to fragment a, Purpose of this layer is to provide a reliable, Ensures that the data units are delivered error, Ensures that there is no loss or duplication of, Provides connectionless or connection oriented, Multiplex multiple connection over a single, Session layer provides mechanism for controlling, This layer requests for a logical connection to, Any necessary log-on or password validation is, Session layer is also responsible for terminating, This layer provides services like dialogue, Session layer can also provide check-pointing, Presentation layer defines the format in which, Also handles data compression and data encryption, Application layer interacts with application, Application layer contains management functions, Examples of application layer are applications, A message begins at the top application layer and, As the message descends, each successive OSI, A header is layer-specific information that, Conversely, at the receiving end, headers are. . 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