In a prior Cisco CCENT accreditation exam tutorial, we mentioned broadcasts in addition to the potential of a broadcast thunderstorm. (If you overlooked that one, pay a visit to my website’s Lessons section. ) Inside today’s tutorial, we’re going discuss several different normal network devices in addition to how they aid to limit broadcast distribution – or in some instances, how they perform not help!

Inside the “do not necessarily help” department, we will find hubs and even repeaters. These 2 devices operate at Layer 1 involving the OSI super model tiffany livingston (the Physical layer), and their bottom purpose is to be able to strengthen the electric powered signals sent more than the cable. Imply have anything to be able to do with switching or routing, and they tend not to support to limit broadcasts. ( is simply just a repeater with an increase of ports. )

On the other end regarding the spectrum, many of us have routers. Routers operate at Coating 3 of typically the OSI model (the Network layer), plus by default routers do not frontward broadcasts. They can certainly be configured to “translate” certain transmission types into unicasts, but you’ll study more about that in the CCNA studies.

Since routers perform not forward contacts, there’s a misunderstanding that routers have nothing to conduct with broadcasts. Routers can indeed generate shows, and they also can acknowledge them – but they will never forwards them. That’s the important distinction.

In between these two extremes, we find switches. Switches operate at Coating 2 of the particular OSI model (the Data Link layer), and the predetermined behavior of a switch is in order to accept a broadcast and forward this out every some other single port about that switch apart from the port that will first received typically the broadcast.

If that will feels like a whole lot of broadcast forwarding, it is! In case we have an 80-port switch and another dock receives a transmission, by default a copy of that send out will probably be forwarded out and about the other seventy nine ports. More than likely, not all of these hosts connected in order to those switchports require to see of which broadcast, and mailing unnecessary broadcast outcomes in an unnecessary use of network resources, particularly band width.

Luckily for all of us, you will find a way to be able to configure a Cisco switch to control which ports acquire that broadcast, and we’ll take the look at that method in typically the next installment associated with my Cisco CCENT certification exam training series!

Chris Bryant, CCIE #12933, is definitely the owner regarding The Bryant Advantage, home of totally free Carbonilla CCENT Certification in addition to CCNA Certification Exam tutorials, The best CCNA Study Package, in addition to Ultimate CCNP Examine Packages.

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