COMMUNICATION AND COMPUTER NETWORK 4.1 INTRODUCTION Today computer is available in many offices and homes and therefore there is a need to share data and programs among various computers with the advancement of data communication facilities. The communication between computers has increased and it thus it has extended the power of computer beyond the computer room. Now a user sitting at one place can communicate computers of any remote sites through communication channel. The aim of this chapter
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error correction • flow control • • In LANs DL can be broken down into two sub-layers: • media access control (MAC) • logical link control (LLC). • flow and error control Datalink Layer Addressing 3 • Frame transmitted Datalink Layer Addressing 4 • Frame received • Note MAC addresses LAN Architecture Model • A network’s architecture consists of: • Access methodology • Network Logical topology • Network Physical topology 5 No single architecture is best in all
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software NetWare‚ LAN Cards (Ethernet Card)‚ cables and connectors etc required for connecting computers included in it. Many organisations need multi-user environment‚ which allows sharing of data as well as expensive resources like printers and storage. Following figures shows the multi-user system‚ which includes LAN. A local Area Network is a system of interlinked personal computer‚ sharing common resources‚ like disks‚ printers etc. These networks are widely used now days. LAN used for following
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Physical and Logical Topologies Objectives After reading this chapter and completing the exercises you will be able to: • Describe the basic and hybrid LAN physical topologies‚ their uses‚ advantages‚ and disadvantages • Describe a variety of enterprise-wide and WAN physical topologies‚ their uses‚ advantages‚ and disadvantages • Compare the different types of switching used in data transmission • Understand the transmission methods‚ or logical topologies‚ underlying Ethernet
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- Suresh Khanal Computer Networking Short Questions and Answer www.psexam.com Computer Networking Short Questions and Answers Suresh Khanal Kalanki‚ Kathmandu shkhanal@gmail.com shkhanal@yahoo.com Published By: http://www.psexam.com contact: info@psexam.com Computer Networking: Short Questions and Answers Published by PS Exam Kalanki‚ Kathmandu Nepal www.psexam.com Copyright ©2009 author. No part of this publication may be reproduced‚ stored in a retrieval system or transmitted
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Technology - It defines an industry that uses computers‚ networking‚ software programming‚ and other equipment and processes to store‚ process‚ retrieve‚ transmit‚ and protect information. LAN - local area network (LAN) consists of two or more computers connected together in a building or home using software and hardware. A LAN is contrasted to a wide area network (WAN) such as the Internet‚ which covers a large geographic area. Network - Is a collection of computers and devices interconnected by communications
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Network Topologies • LANs and WANs - Geographical coverage • LANs – A single geographical location‚ such as office building‚ school‚ etc – Typically High speed and cheaper. • WANs – Spans more than one geographical location often connecting separated LANs – Slower – Costly hardware‚ routers‚ dedicated leased lines and complicated implementation procedures. 1 Network Topologies • Topology - Physical and logical network layout – Physical – actual layout of the computer cables and other
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Chapter 7 Lab Exercise 7.1.1 Part of the distinction between LAN and WAN networks is ownership. Why is it impractical for an organization to own the entirety of a WAN? Why is it favorable for an organization to maintain ownership of the entirety of a LAN? Use your textbook and Internet research to compose your answer A) There are no limitations on WANs so they can be custom built for the size of the organization. For the purpose of organizational expansion. Exercise 7.1.2 Given the problems with
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Case Study: Network Topologies Research You have been asked to help upgrade the LAN at a very successful ABC firm with five departments in one building and a total of 560 employees. Although the firm’s employees understand accounting‚ they haven’t spent much time improving their network. Currently‚ it runs 10Base-T Ethernet and relies on 35 hubs to connect every user workstation to the network. Most of these workstations were purchased within the past two years‚ when the firm experienced a growth
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PComputer network A computer network is simply two or more computers connected together so they can exchange information. A small network can be as simple as two computers linked together by a single cable. This course introduces you to the hardware and software needed for a network‚ and explains how a small network is different from larger networks and the Internet. Most networks use hubs to connect computers together. A large network may connect thousands of computers and other devices together
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