In a prior Cisco CCENT certification exam tutorial, we mentioned broadcasts plus the potential involving a broadcast storm. (If you skipped that one, pay a visit to my website’s Tutorials section. ) In today’s tutorial, we’re going discuss several different common network devices plus how they aid to limit broadcast propagation – or sometimes, how they perform not help!

Found in the “do not help” department, we will find hubs and even repeaters. These 2 devices operate from Layer 1 of the OSI model (the Physical layer), and their single purpose is in order to strengthen the electric powered signals sent more than the cable. Imply have anything to do with switching or routing, plus they never help to limit broadcasts. (A hub is simply just a repeater with an increase of ports. )

On the other end of the spectrum, we have routers. Routers operate at Part 3 of the particular OSI model (the Network layer), and by default routers do not frontward broadcasts. They can be configured in order to “translate” certain transmission types into unicasts, but you’ll find out more about of which in the CCNA research.

Since routers do not forward shows, there’s a false impression that routers have got nothing to conduct with broadcasts. Routers can indeed generate broadcasts, and so they can accept them – nevertheless they will not likely forward them. That’s a great important distinction.

Involving these two two extremes, we discover switches. Changes operate at Layer 2 of the OSI model (the Data Link layer), and the default behavior of a new switch is to be able to accept a broadcast and forward this out every additional single port in that switch apart from the port that first received typically the broadcast.

If that will seems like a lot of broadcast forwarding, it is! In the event that we provide an 80-port switch and something interface receives a broadcast, by default a copy of that send out will likely be forwarded out and about the other seventy nine ports. Almost certainly, not necessarily all of these hosts connected in order to those switchports require to see that broadcast, and sending unnecessary broadcast effects in an needless use of community resources, particularly bandwidth.

Luckily for all of us, there is a way in order to configure a Cisco switch to control which ports get that broadcast, in addition to we’ll take a look at that will method in the next installment regarding my Cisco CCENT certification exam article series!

Chris Bryant, CCIE #12933, is the owner regarding The Bryant Edge, home of free Cisco CCENT Certification and CCNA Certification Test tutorials, The best CCNA Study Package, and even Ultimate CCNP Analyze Packages.

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