The Hub/ Switch By: Alex Stordahl Mr. Bennig Hour 2
What is a hub? What is a switch? • Switchis a small hardware device that joins multiple computers together within one local area network (LAN) • A Hub is used in a wired network to connect Ethernet cables from a number of devices together. The hub allows each device to talk to the others.
Active Hubs • An active hubs works more than just a connector but also regenerates the data bits to ensure the signals are strong. • It provides an active participation in the network aside from acting as an interface. It participates in the data communication, such as storing signals received through the input ports, before forwarding them. It can monitor the data it is forwarding and sometimes help improve signals before forwarding them to other connections. Such a feature makes troubleshooting network problems easier.
Intelligent hubs. • An intelligent hub can perform everything that the passive hub and active hub do, and help manage network resources effectively to ensure that the performance of the network is highly efficient. An intelligent hub can also help in troubleshooting by pinpointing the actual location of the problem.
How the Hub works. • A computer's network interface card sends out packets to the network. The hub receives this information and passes it through all the ports on the hub that have attached cables. This means that the computer that sent the data also gets it back. The networking protocols have ways of determining which computer on the network needs to process the information.
How the Switch works Pt. 1 • Most common switches operate by learning the MAC addresses of all connected clients, servers, and peripherals, and associating each address with one if it ports. When a switch receives an incoming signal, it creates a temporary circuit between the sender and the receiver. The temporary circuit provides two important benefits.
How the Switch works Pt. 2 • First, the circuit allows the sender and receiver momentarily to exchange information without intrusion from other devices. Each pair of communicating devices utilizes the full bandwidth of the network instead of sharing bandwidth, as they do in unswitched Ethernet networks.
How the Switch works Pt. 3 • Second, the circuit ensures that information travels directly between the communicating computers.
Major Manufacturers of Hubs • Syba, Zonet, Ppa Int’l, Sabrent, Logitech, GWC, iHome, Link Depot, CablesToGo, Belkin. • Hubs can range from $7.99 to $54.99
Major Manufacturers of Switches • NETGEAR, D-Link, SMC. • Switches can range from $19.99 to $159.99
History of the Switch • On August 29, 1969 the first network switch and the first piece of network equipment (called "IMP", which is short for Interface Message Processor) is sent to UCLA. • On September 2, 1969 the first data moves from UCLA host to the IMP switch.
History of the Hub • 1994 - The system was completed in 1994. It introduced an on-line remote access facility to four government departments, allowing users to display and print maps at remote locations using personal computers. The Hub's major users include land master planning by the Urban Redevelopment Authority, planning of Mass Rapid Transit (MRT) lines by the MRT Corporation, and the compilation and analysis of state land ownership statistics by the Ministry of Law's Land Office
Hub History Pt. 2 • Oct 26, 1998 - Software developer Dawn DeBruyn sells a product that turns a single personal computer into a hub for the whole family.
Difference Between a Hub and a Switch • The hub is basically the least expensive and the least intelligent. Basically, anything that comes to one port is sent out to the others. • A switch does what a hub does, but way better. By paying attention to the traffic and other things that come along, it can learn and study where the addresses are.
Sources • www.answers.com • http://kb.netgear.com/app/answers/detail/a_id/233 • http://www2.edc.org/cope/networkprimer/primch5.pdf • www.newegg.com