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CompTIA Network+ Certification Exam Tutorial: Hubs, Repeaters, Bridges Jordan Bell Womens Jersey , and Switches Computers Articles | October 23, 2006

To pass the Network+ exam, you must know the differences and similarities when it comes to hubs, repeaters, and bridges. Learn these important details from Chris Bryant, CCIE #12933.



To pass your Network+ certification exam Noah Vonleh Womens Jersey , you must know the differences between hubs, repeaters, bridges, and switches. The differences are straightforward for the most part, so let's examine the basic purpose of these devices.


Hubs and repeaters both work at the Physical layer of the OSI model. They do not help to direct traffic toward the proper destination, as routers and switches do. Their purpose in the network is simply to make the signal strong enough to reach its destination Robert Covington Womens Jersey , by regenerating the signal. Hubs and repeaters both take an incoming data signal and make a clean, strong copy of the signal. Otherwise, the signal would suffer from attenuation, the gradual weakening of a signal as it gets farther and farther away from the source.


Repeaters are just about extinct in today's networks, because they only have one input port and one output port. Naturally, this means we could only regenerate a single data signal. Hubs are really just multiport repeaters Keita Bates-Diop Womens Jersey , but their multiple ports give them some value in today's networks.


By using a hub to connect hosts, we're left with one collision domain. Any data sent by these hosts is subject to colliding with data sent by another host. We'll talk more about collision domains in another CompTIA tutorial, but keep in mind that hubs do not break them up.


Using a hub also results in one broadcast domain, since a broadcast sent by any of these hosts will be heard by all other hosts.


Bridges and switches work at the Data Link layer of the OSI model, making them "Layer Two" devices. Both read MAC addresses to create a MAC address table, which allows the switches to help send frames to their proper destination. You see very few bridges in today's networks Jake Layman Womens Jersey , especially with the advent of Layer Three switches.


It's not that bridges are bad at their job, it's just that switches are better. They can operate at higher speeds and offer more options, especially now that many new switches can perform routing as well as switch. Cheap Jerseys Wholesale Jerseys Cheap Jerseys From China Cheap Jerseys From China Wholesale Jerseys Free Shipping Wholesale NFL Jerseys China Wholesale Baseball Jerseys Wholesale NFL Jerseys China Cheap NBA Jerseys Cheap Nike Shoes Womens
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