Cisco ccna certification exam tutorial the osi models physical layer 79816

Cisco CCNA Certification Test Tutorial: The OSI Types Bodily LayerCisco CCNA Certification Test Tutorial: The OSI Versions Physical LayerTo go your CCNA Test and gain this coveted certification, you’ve got to grasp the 7 levels of your OSI product and what Just about every layer does. For all those of you taking the two-exam route, you may assume A good number of OSI design queries over the Intro exam. Within this seven-aspect series, we’ll devote a while taking a look at Every single from the OSI model levels, starting with the Actual physical layer.Typically, CCNA candidates ask Should the OSI design has any realistic makes use of for network directors. I utilized to wonder the exact same thing, and I am able to now tell you that The solution is undoubtedly yes!The OSI model isn’t a little something you want to memorize and afterwards forget about, as using the OSI model offers you a structured strategy for troubleshooting. Anytime a network product isn’t Functioning thoroughly, I usually say to “start in the physical layer”. The Actual physical layer is Layer Among the list of OSI product, and This is when troubleshooting should really normally start off. Would be the machine on? Can it be adequately connected? If everything is ok at Layer One, you only transfer around Layer Two, and carry on On this structured manner right until the trouble is determined.The Bodily layer would be the layer at which bits are transmitted about the Bodily media. There is no routing or switching happening at this layer. The information has become damaged down into a lot more workable items right until the information takes the form of kinds and zeroes within the Bodily layer.Even though there’s no routing or switching for the Actual physical layer, CCNA candidates need to be familiar with a couple of network devices that do the job at fast Layer A single. A repeater is a device that regenerates an electrical sign, permitting the sign to journey for a longer period distances with no fading. (The whole process of an electrical sign steadily fading in power in excess of length is “attenuation”.) A hub is largely a multiport repeater, and both of those of such products are thought of Actual physical layer units. Ethernet and Token Ring equally operate for the Physical layer in addition.Discovering the OSI product’s Actual physical layer isn’t just critical as part of your CCNA Examination experiments, it’s step one in almost any community troubleshooting. All things considered, your network’s close customers will have a troublesome time sending print Work opportunities to some printer that’s turned off!