Cisco ccna certification exam tutorial the osi models physical layer 93489

Cisco CCNA Certification Examination Tutorial: The OSI Products Physical LayerCisco CCNA Certification Test Tutorial: The OSI Products Actual physical LayerTo move your CCNA Examination and generate this coveted certification, you’ve bought to learn the 7 layers of your OSI design and what Each and every layer does. For anyone of you getting The 2-Test route, you may expect A number of OSI design concerns over the Intro Examination. In this 7-element sequence, we’ll expend some time taking a look at each of your OSI design layers, starting off Using the Actual physical layer.Typically, CCNA candidates question When the OSI product has any practical uses for community directors. I accustomed to speculate the same detail, and I am able to now show you that the answer is undoubtedly Certainly!The OSI model isn’t anything you would like to memorize after which you can ignore, as using the OSI model provides you with a structured approach for troubleshooting. Every time a community product isn’t working appropriately, I normally say to “start off for the physical layer”. The Actual physical layer is Layer Among the list of OSI product, and this is where troubleshooting need to normally begin. Would be the system on? Is it appropriately related? If every thing is okay at Layer One, you simply go as much as Layer Two, and carry on On this structured manner until eventually the issue is discovered.The Physical layer is definitely the layer at which bits are transmitted more than the Actual physical media. There isn't a routing or switching occurring at this layer. The data continues to be broken down into more manageable items until the data takes the shape fast of types and zeroes at the Bodily layer.Although there’s no routing or switching with the Actual physical layer, CCNA candidates needs to be aware of several network devices that work at Layer One particular. A repeater is a device that regenerates an electrical signal, enabling the sign to travel for a longer period distances without having fading. (The whole process of an electrical signal steadily fading in toughness more than distance is “attenuation”.) A hub is largely a multiport repeater, and equally of those equipment are viewed as Physical layer devices. Ethernet and Token Ring both of those function on the Actual physical layer in addition.Learning the OSI model’s Bodily layer isn’t just essential within your CCNA Examination scientific tests, it’s step one in any community troubleshooting. In spite of everything, your network’s finish end users are going to have a tricky time sending print Work opportunities into a printer that’s turned off!