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There’s practically nothing I appreciate more than teaching Cisco technologies, especially CCNA candidates. Regardless of whether it’s in-human being or online, All people’s thrilled to get there. There’s a sense of anticipation while in the air, and everyone is ready to work hard, get their fingers to the racks of Cisco routers and switches I
have available…
… and after that I crack out the OSI product chart. Chins slump. Men and women sigh, or at the least wish they hadn’t ordered decaf that early morning.
Ok, it’s not that negative. But it really does mood the exhilaration somewhat. I generally get a sense of “why can’t we just hurry up and acquire about the routers and switches? Why do we have to know this dry stuff?”
A person purpose is the fact that Cisco requires you understand the OSI product within and out for both of those the Intro and ICND examinations. It's important to acknowledge that’s a very good motive, but nonetheless, college students discover the OSI design information and facts to generally be incredibly dry.
I understand that, mainly because I’ve been there. My to start with exposure into the OSI design was basically in a very Novell “Networking Systems” course, and gentleman, https://socialhattori.com/ was that chart at any time dry. They crammed each known protocol (and some unfamiliar ones, I feel) in the OSI design. It looked like a large jigsaw puzzle, and the actual issue is usually that I didn’t know very well what the heck the vast majority of that stuff was.
So I dutifully tried to memorize this large chart. I managed to pass the exam, but I wondered what all that effort had actually been for. It’s not such as you sit all-around inside of a server place or wiring closet and explore the OSI model.
For a CCNA candidate, you don’t have to worry about every one of the protocols I memorized way again when, however, you do really have to understand what transpires at Every layer. Which ends up in this concern:
“If I perform with routers and switches, How come I really need to find out about all one other levels? Don’t routers and switches just get the job done at layer two and three?”
Of course, switches perform at Layer two and routers at Layer 3. But to truly have an understanding of networking, you’ve got to comprehend what comes about at the opposite levels. Why?
Most network directors and engineers are going to expend quite a bit much more time troubleshooting than setting up. That’s just the best way it is. And also to troubleshoot efficiently, you’ve obtained to know very well what’s happening in any way layers with the OSI model, not merely layers two and three.
As someone who’s done loads of choosing and carried out an incredible quite a few position interviews, I am able to show you that the opportunity to troubleshoot would be the number one high-quality I seek out. That’s why I notify CCNA and CCNP candidates which they’ve obtained to receive each of the arms-on follow they are able to even though I recognize the necessity of concept, the one method to create troubleshooting means is to work on the actual offer. No simulator system
is going to teach you how to troubleshoot.
Also, the only way to really create your troubleshooting talents is always to understand what’s going on more than all the community, not just the routers and switches. Troubleshooting constantly starts at Layer 1 in case you don’t obtain a challenge for the Physical layer, and everything’s high-quality together with your routers and switches, how are you currently heading to carry on troubleshooting if you don’t know what another techniques are as info moves closer to the top consumer?
So when it comes to the OSI design, don’t just give it A fast the moment-in excess of and move ahead for the entertaining things as part of your CCNA scientific tests. The tangible benefit of passing your examinations is excellent, but it’s the hidden advantage of establishing your own personal troubleshooting methodology which makes mastering the OSI model worthwhile.