Design Essentials of Networking

Copyright © Texas Education Agency, All rights reserved. 22 “Copyright and Terms of Service Copyright © Texas Education Agency. The materials found on this website are copyrighted © and trademarked ™ as the property of the Texas Education Agency and may not be reproduced without the express written permission of the Texas Education Agency, except under the following conditions: 1)Texas public school districts, charter schools, and Education Service Centers may reproduce and use copies of the Materials and Related Materials for the districts’ and schools’ educational use without obtaining permission from the Texas Education Agency; 2) Residents of the state of Texas may reproduce and use copies of the Materials and Related Materials for individual personal use only without obtaining written permission of the Texas Education Agency; 3) Any portion reproduced must be reproduced in its entirety and remain unedited, unaltered and unchanged in any way; 4) No monetary charge can be made for the reproduced materials or any document containing them; however, a reasonable charge to cover only the cost of reproduction and distribution may be charged. Private entities or persons located in Texas that are not Texas public school districts or Texas charter schools or any entity, whether public or private, educational or non-educational, located outside the state of Texas MUST obtain written approval from the Texas Education Agency and will be required to enter into a license agreement that may involve the payment of a licensing fee or a royalty fee. Call TEA Copyrights with any questions you have.

3 Learning Objectives 3 Assimilating hubs into a personal network Incorporate switches into a network Deciding a first-class network topology a network environment Copyright © Texas Education Agency, All rights reserved.

4 Hubs 4 Used to connect segments of a LAN that uses multiple ports. Hubs are the central point of concentration for star network. Copyright © Texas Education Agency, All rights reserved.

5 Active or Passive Hubs 5 Downside of an active hub it require a cable bandwidth shared among connected stations. Active hub, also called a multiport repeater, regenerates signal and passes it along, that requires electrical power to run. Since no electrical power a passive hub is simply central connection point, with no amplification or regeneration. Hybrid hubs maximize network’s efficiency by interconnecting different types of cables and topologies. Copyright © Texas Education Agency, All rights reserved.

6 Remember this about Switches 6 Central connecting point for star topology network Determines destination of message and sends it only to destination port Provide full bandwidth to each station on network Handle several conversations at once More expensive than hubs Provide better performance Device of choice Copyright © Texas Education Agency, All rights reserved.

Copyright Texas Education Agency (TEA) 7 Variations on the Major Topologies 7 Three variations of major network topologies are combinations of topologies Mesh: A mesh network in which every device connects to every other is called a full mesh. It’s a hybrid network topology used for fault tolerance, and one in which all computers connect to each other. Star Bus: Another major topology which the computers connect via a central connecting point, majority of the time used a hub. Star Ring: Wired-like star networked topology device, which handles traffic like a ring.

8 Mesh Topology 8 Most fault tolerant topology it also offers multiple connections to each device. Uses convoluted cabling configuration; Every device connected to others in network. Mesh are expensive to implement. Copyright © Texas Education Agency, All rights reserved.

9 Star Bus Data on a star network always passes through the hub, switch, or concentrator before continuing to its destination. Uses bus backbone Interconnects two or more hubs 9 Copyright © Texas Education Agency, All rights reserved.

10 Star Ring Wired as star Handles traffic like ring Can have several outer hubs connected to inner hub Single computer failure does not affect network 10 Copyright © Texas Education Agency, All rights reserved.

11 Review 11 A network consistently changes and a network layout should be accurately maintained. Used to connect segments of a LAN that uses multiple ports, a Hub is the central point of concentration for star network, passes electronic signals to network Active hub regenerates signals Passive hub simply passes signals along Copyright © Texas Education Agency, All rights reserved.

Review Continued A switch is a specialized networking device that manages networked connections between any pair of star-wired devices on a network. Switches offers a greater bandwidth and intelligence. It provides significant performance advantages over hubs, they have become the device of choice in corporate star topology networks Mesh is most fault tolerant of all network topologies, allowing every computer to communicate with every other computer 12