Page 27 - M. Abrahim Thesis
P. 27

Computer Network                                                             2021



                    The following are some of the factors that determine throughput:


                       •  Internetworking devices
                       •  Type of data being transferred

                       •  Network topology
                       •  Number of users on the network

                       •  User’s computer
                       •  Server computer

                       •  Power conditions
                       •  Congestion

                   A  network’s  theoretical  bandwidth  is  an  important  consideration  in  network  design,
            because network bandwidth is never greater than the limits imposed by the chosen medium and
            networking technologies.

                   https://www.youtube.com/watch?v=DHa9gxRfAmM&t=25s

            2.6.1 Data Transfer Calculation


                   Network designers and administrators are often called on to make decisions regarding
            bandwidth.  Should  the  size  of  the  WAN  connection  be  increased  to  accommodate  a  new
            database? Is the current LAN backbone of sufficient bandwidth for a streaming video training
            program? The answers to questions like these are not always easy to find, but one place to start
            is with a simple data transfer calculation.

                   Using the formula T = S / BW (transfer time = size of file / bandwidth) lets a network
            administrator estimate several of the important components of network performance. If the
            typical file size for a given application is known, dividing the file size by the network bandwidth
            yields an estimate of the fastest time that the file can be transferred.

                   https://www.youtube.com/watch?v=bmDhGVicgiQ

            2.7   Networking Models

                   Learning about networking is easier when you start with theory and concepts and then
            move on to the more concrete aspects of implementation. As a network professional, you need
            to  learn  the  theory  of  how  networks  communicate  before  you  design,  build,  and  maintain
            networks. Learning the concept of layers can help you understand the action that occurs during
            communication from one computer to another. This section covers the concepts of layering and
            how it applies specifically to communication models. Two specific models, OSI and TCP/IP, are
            described, as well as peer-to-peer layer communication and encapsulation.


                   https://www.youtube.com/watch?v=61kRxdZ5p-o








                                                         31
   22   23   24   25   26   27   28   29   30   31   32