There's nothing I take pleasure in greater than educating Cisco technologies, especially CCNA candidates. Whether or not it's in-particular person or online, everyone's excited to be there. There is a sense of anticipation in the air, and everyone is ready to work arduous, get their palms on the racks of Cisco routers and switches I have available... ... and then I break out the OSI mannequin chart. Chins slump. Individuals sigh, or not less than wish they hadn't ordered decaf that morning. Okay, it is not that bad. But it surely does mood the excitement a little. I always get a sense of "why cannot we simply hurry up and get on the routers and switches? Why do we have to learn this dry stuff?" One reason is that Cisco calls for you know the OSI model inside and outside for both the Intro and ICND exams. You have to admit that is a reasonably good purpose, however nonetheless, college students find the OSI model info to be very dry. I understand that, because I've been there. My first publicity to the OSI mannequin was really in a Novell "Networking Applied sciences" class, and man, was that chart ever dry. They crammed each known protocol (and some unknown ones, I believe) into the OSI model. It seemed like an enormous jigsaw puzzle, and the true drawback is that I did not know what the heck most of that stuff was. So I dutifully tried to memorize this massive chart. I managed to move the examination, but I wondered what all that effort had actually been for. It's not like you sit round in a server room or wiring closet and discuss the OSI model. As a CCNA candidate, you do not have to worry about all the protocols I memorized manner back when, however you do should know what occurs at every layer. Which leads to this query: "If I work with routers and switches, why do I have to know about all the opposite layers? Don't routers and switches simply work at layer 2 and three?" Yes, switches work at Layer 2 and routers at Layer 3. However to truly perceive networking, you've got to understand what happens on the other layers. Why? Most network administrators and engineers are going to spend a lot extra time troubleshooting than installing. That is simply the way in which it is. And to troubleshoot effectively, you've got to know what is going on on in any respect layers of the OSI model, not simply layers 2 and 3. As somebody who's achieved quite a lot of hiring and performed an amazing many job interviews, I can tell you that the power to troubleshoot is the number one quality I look for. That is why I inform CCNA and CCNP candidates that they've got to get all of the fingers-on practice they can whereas I understand the significance of principle, the only method to develop troubleshooting capacity is to work on the true deal. No simulator program is going to show you easy methods to troubleshoot. Moreover, the only option to actually develop your troubleshooting skills is to know what's going on over your entire network, not just the routers and switches. Troubleshooting always starts at Layer 1 should you don't discover a problem at the Physical layer, and the whole lot's tremendous along with your routers and switches, how are you going to continue troubleshooting if you don't know what the next steps are as data strikes nearer to the top user? So when it comes to the OSI model, do not just give it a fast as soon as-over and move on to the fun stuff in your CCNA studies. The tangible good thing about passing your exams is nice, but it's the hidden good thing about developing your individual troubleshooting methodology that makes mastering the OSI model worthwhile. When you earn your CCNA certification, you've got obtained quite just a few exciting choices forward of you! The majority of CCNAs go on to pursue another Cisco certification, and this is a wise decision. The extra you already know, the more helpful you might be in at present's IT market. A query I'm usually asked by new CCNAs is "Which certification should I go after next?" Usually, these new CCNAs have their eye on the Cisco Certified Security Skilled (CCSP) certification. While including a safety certification to your resume is a wonderful thought, I strongly recommend that new CCNAs acquire their Cisco Licensed Community Skilled (CCNP) certification before pursuing their safety certifications. The CCNP requires you to move three or 4 exams (depending on the path you select) that will demand an additional mastery of some subjects you studies to earn your CCNA as well as several essential topics that you just haven't seen yet. The CCNP builds on the foundation of networking data you built while you earned your CCNA, and your CCNP study will add significantly to your expertise and resume. There are some common applied sciences that you'll see in lots of networks - BGP and route redistribution amongst them - that you don't learn about in your CCNA studies. By pursuing your CCNP, you will also learn rather more about OSPF, switching, and refine your troubleshooting skills. These are abilities that may pay off in your current job in addition to any future job searching
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Chris Bryant, CCIE 12933, tells CCNA candidates why they need to know the OSI model, and that it's not just for the exams!
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