Cisco CCNA Certification: The Importance Of The OSI Model
There’s nothing I enjoy greater than educating Cisco technologies, especially CCNA candidates. Whether it is in-person or online, everybody’s excited to be there. may just be identified these but virtually anyone could very well in a similar fashion be given discount golf shoes There is a sense of anticipation within the air, and everyone is able to work exhausting, get their palms on the racks of Cisco routers and switches I
have available…
… and then I get away the OSI mannequin chart. Chins slump. Folks sigh, or at least wish they hadn’t ordered decaf that morning.
Okay, it is not that bad. But it surely does temper the thrill a little. Numerous the effective girls bedding I always get a sense of “why cannot we simply hurry up and get on the routers and switches? Why do we’ve to study this dry stuff?”
One cause is that Cisco calls for you already know the OSI mannequin inside and outside for both the Intro and ICND exams. You have to admit that’s a reasonably good purpose, however still, students find the OSI mannequin info to be very dry.
I perceive that, as a result of I have been there. My first publicity to the OSI mannequin was truly in a Novell “Networking Technologies” class, and man, was that chart ever dry. and also cute diaper bags if you should look into a number of web-site They crammed every recognized protocol (and a few unknown ones, I believe) into the OSI model. It regarded like a large jigsaw puzzle, and the real downside is that I did not know what the heck most of that stuff was.
So I dutifully tried to memorize this huge chart. I managed to go the exam, however I questioned what all that effort had actually been for. It’s not such as you sit around in a server room or wiring closet and discuss the OSI model.
As a CCNA candidate, you do not have to worry about all of the protocols I memorized way again when, but you do must know what happens at every layer. Which results in this query:
“If I work with routers and switches, why do I’ve 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. But to really understand networking, you’ve got to understand what occurs on the other layers. Why?
Most community directors and engineers are going to spend so much extra time troubleshooting than installing. That is simply the way it is. And to troubleshoot successfully, you have to know what’s going on at all layers of the OSI model, not simply layers 2 and 3.
As somebody who’s executed quite a lot of hiring and carried out an important many job interviews, I can inform you that the flexibility to troubleshoot is the number one high quality I look for. That’s why I inform CCNA and CCNP candidates that they’ve got to get all the hands-on follow they can while I perceive the significance of theory, the only strategy to develop troubleshooting means is to work on the actual deal. No simulator program
is going to teach you how you can troubleshoot.
Moreover, the only way to actually develop your troubleshooting talents is to know what’s going on over the whole community, not just the routers and switches. Troubleshooting all the time begins at Layer 1 when you don’t discover a problem at the Bodily layer, and every part’s wonderful together with your routers and switches, how are you going to proceed troubleshooting if you do not know what the subsequent steps are as data strikes nearer to the end consumer?
So relating to the OSI mannequin, do not simply give it a fast as soon as-over and move on to the fun stuff in your CCNA studies. The tangible advantage of passing your exams is great, nevertheless it’s the hidden benefit of developing your own troubleshooting methodology that makes mastering the OSI model worthwhile.