Cisco Certification - The OSI Model Isn't Just For Exams Anymore!
By Chris Bryant
There's nothing I enjoy more than teaching Cisco technologies, especially CCNA
candidates. Whether it's in-person or online, everyone's excited to be there.
There's a sense of anticipation in the air, and everyone is ready to work hard,
get their hands on the racks of Cisco routers and switches I have available...
... and then I break out the OSI model chart. Chins slump. People sigh, or at
least wish they hadn't ordered decaf that morning.
Okay, it's not that bad. But it does temper the excitement a little. I always
get a sense of "why can't we just hurry up and get on the routers and switches?
Why do we have to learn this dry stuff?"
One reason is that Cisco demands you know the OSI model inside and out for both
the Intro and ICND exams. You have to admit that's a pretty good reason, but still,
students find the OSI model information to be very dry. I understand that, because
I've 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 every known
protocol (and some unknown ones, I think) into the OSI model. It looked like a
giant jigsaw puzzle, and the real problem is that I didn't know what the heck
most of that stuff was.
So I dutifully attempted to memorize this massive chart. I managed to pass the
exam, but I wondered what all that effort had really been for. It's not like you
sit around in a server room or wiring closet and discuss the OSI model.
As a CCNA candidate, you don't have to worry about all the protocols I memorized
way back when, but you do have to know what happens at each layer. Which leads
to this question:
"If I work with routers and switches, why do I have to know about all the other
layers? Don't routers and switches just work at layer 2 and 3?" Yes, switches
work at Layer 2 and routers at Layer 3. But to truly understand networking,
you've got to understand what happens at the other layers. Why?
Most network administrators and engineers are going to spend a lot more time
troubleshooting than installing. That's just the way it is. And to troubleshoot
effectively, you've got to know what's going on at all layers of the OSI model,
not just layers 2 and 3.
As someone who's done a lot of hiring and conducted a great many job interviews,
I can tell you that the ability to troubleshoot is the number one quality I look
for. That's why I tell CCNA and CCNP candidates that they've got to get all the
hands-on practice they can; while I understand the importance of theory, the
only way to develop troubleshooting ability is to work on the real deal. No
simulator program is going to teach you how to troubleshoot.
Additionally, the only way to truly develop your troubleshooting abilities is to
know what's going on over the entire network, not just the routers and switches.
Troubleshooting always starts at Layer 1; if you don't find a problem at the
Physical layer, and everything's fine with your routers and switches, how are
you going to continue troubleshooting if you don't know what the next steps are
as data moves closer to the end user?
So when it comes to the OSI model, don't just give it a quick once-over and move
on to the fun stuff in your CCNA studies. The tangible benefit of passing your
exams is great, but it's the hidden benefit of developing your own troubleshooting
methodology that makes mastering the OSI model worthwhile.
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of free
CCNA and
CCNP tutorials,
The Ultimate CCNA Study Package, and Ultimate CCNP
Study Packages. For a FREE copy of his latest e-books, "How To Pass The CCNA"
and "How To Pass The CCNP", visit the website and download your free copies. You
can also get FREE CCNA and CCNP exam questions every day! Pass the
CCNA exam
with The Bryant Advantage!
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