Cisco CCNA Certification: The Importance Of The OSI Mannequin
Cisco CCNA Certification: The Importance Of The OSI Mannequin
There's nothing I enjoy more than instructing Cisco applied sciences, particularly CCNA candidates. Whether it is in-individual or on-line, everybody's excited to be there. There's a sense of anticipation within the air, and everybody is able to work hard, get their fingers on the racks of Cisco routers and switches I
have available...
... after which I get away the OSI model chart. Chins slump. People sigh, or no less than want they hadn't ordered decaf that morning.
Okay, it isn't that bad. However it does temper the thrill a little. I at all times get a way of "why can't we just hurry up and get on the routers and switches? Why do we have now to be taught this dry stuff?"
One purpose is that Cisco demands you realize the OSI mannequin inside and out for each the Intro and ICND exams. You must admit that's a fairly good reason, but still, students discover the OSI mannequin data to be very dry.
I perceive that, as a result of I have been there. My first exposure to the OSI model was actually in a Novell "Networking Technologies" class, and man, was that chart ever dry. They crammed each identified protocol (and a few unknown ones, I feel) into the OSI model. It looked like a giant jigsaw puzzle, and the actual downside is that I didn't know what the heck most of that stuff was.
So I dutifully attempted to memorize this large chart. I managed to go the exam, however I puzzled what all that effort had really been for. It isn't such as you sit around in a server room or wiring closet and focus on the OSI model.
As a CCNA candidate, you don't have to fret about all of the protocols I memorized means again when, but you do have to know what happens at each layer. Which ends up in this question:
"If I work with routers and switches, why do I've to find out about all the other layers? Do not routers and switches just work at layer 2 and 3?"
Sure, switches work at Layer 2 and routers at Layer 3. But to really understand networking, you've got to perceive what occurs at the different layers. Why?
Most community directors and engineers are going to spend so much more time troubleshooting than installing. That's just the best way it is. And to troubleshoot successfully, you have to know what's going on at all layers of the OSI mannequin, not just layers 2 and 3.
As someone who's completed numerous hiring and carried out an incredible many job interviews, I can let you know that the ability to troubleshoot is the primary high quality I look for. That's why I tell CCNA and CCNP candidates that they have to get all the palms-on follow they will while I perceive the importance of theory, the one strategy to develop troubleshooting skill is to work on the actual deal. No simulator program
goes to teach you learn how to troubleshoot.
Additionally, the one method to really develop your troubleshooting talents is to know what is going on on over the complete community, not simply the routers and switches. Troubleshooting at all times begins at Layer 1 for those who do not find an issue on the Bodily layer, and all the pieces's superb with your routers and switches, how are you going to proceed troubleshooting if you do not know what the subsequent steps are as information moves closer to the tip consumer?
So with regards to the OSI mannequin, don't simply give it a quick once-over and transfer on to the enjoyable stuff in your CCNA studies. The tangible advantage of passing your exams is great, nevertheless it's the hidden advantage of creating your personal troubleshooting methodology that makes mastering the OSI mannequin worthwhile.
Once you earn your CCNA certification, you've bought fairly a couple of thrilling decisions ahead of you! The vast majority of CCNAs go on to pursue one other Cisco certification, and this can be a clever decision. The more you understand, the extra valuable you are in immediately's IT market.
A question I am often requested by new CCNAs is "Which certification ought to I'm going after subsequent?" Typically, these new CCNAs have their eye on the Cisco Licensed Safety Professional (CCSP) certification. Whereas adding a security certification to your resume is an excellent idea, I strongly advocate that new CCNAs purchase their Cisco Certified Network Professional (CCNP) certification earlier than pursuing their security certifications. The CCNP requires you to go three or four exams (relying on the trail you choose) that may demand a further mastery of some topics you research to earn your CCNA in addition to a number of vital subjects that you simply haven't seen yet.
The CCNP builds on the inspiration of networking knowledge you constructed if you earned your CCNA, and your CCNP examine will add drastically to your abilities and resume. There are some frequent technologies that you will see in many networks - BGP and route redistribution among them - that you do not find out about in your CCNA studies. By pursuing your CCNP, you'll additionally be taught much more about OSPF, switching, and refine your troubleshooting skills. These are skills that can repay in your present job as well as any future job looking
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