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D-BUST Your Computer – Part 5
D-BUST Your Computer – Part 5 By: Janet L. Hall T Stands for Templates and Time Let’s start with Templates. What is a template? In its simplest form, a template is a document you have created (or one already created for you) in which you store...
Introduction to Dedicated Servers
A dedicated server is a single computer on a web-hosting network that is leased or rented, and dedicated to just one customer. A service provider monitors the computer’s hardware, network connectivity, and routing equipment, while the customer...
The Spyware Who Loved Me
Don’t ever let anybody tell you otherwise, the Internet is not a safe place to take your computer systems without adequate protection. It wasn’t too long ago that anti-virus and firewall software could provide your systems with more than enough...
The two most important things you need to run a wildly successful web site
There are really only two major and really important things you need to do to run a wildly successful e-commerce web site. If you do not have these two, it really doesn’t matter what else you have or do, your web site is guaranteed to fail. On the...
Wiping a Hard Drive - How to Ensure Your Data is Gone
The time has come, you have put up with that clunky old PC long enough. You finally bite the bullet and go out and buy yourself a new computer. Being the Good Samaritan that you are, you plan to donate your old PC to a local charity to be given...
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Cisco CCNA / CCNP Home Lab: Why You Need An ISDN Simulator
ISDN is a vital topic for today's CCNA and CCNP candidates, especially for the ICND and Intro exams - you've got to know ISDN inside and out to pass those exams. Naturally you want to include it in your home lab.
What many candidates don't realize is that you can't connect two Cisco routers directly via their Basic Rate Interface (BRI) interfaces you've got to have another device between them called an ISDN simulator.
An ISDN simulator is not one of those software programs pretending to be routers ("router simulators") this is a piece of hardware that acts as the telephone company in your home lab. Older simulators come with preprogrammed phone numbers and SPIDs, where newer ones let you program the phone numbers you want to use. Either way, an ISDN simulator is great for your CCNA/CCNP home lab, because you can practice dial scenarios that actually work. And you get to troubleshoot the ones that don't, which is also important to learn!
You don't need any special cables or connectors you just connect both of your routers' BRI interfaces to the ISDN simulator with a straight-through cable and you're ready to go.
In years past, this was a major problem for 640-801, 811, and 821 studies, because the simulators used to be so expensive. New ones can still be pricey ($600 and up), but with the sudden influx
of used ISDN simulators on ebay and Cisco resellers, you can get a used one that will do the job for you.
Why are there suddenly so many ISDN simulators on the market? Cisco recently removed ISDN from the CCIE R&S exam, so a lot of CCIE rack resellers as well as private individuals are selling their simulators. There's never been a better time to add ISDN to your home lab. If taken care of (kept out of extreme heat), they can last for quite a few years. The one I purchased for my IE home lab is still working well.
If you choose to purchase a new simulator, you can run a Google search to find vendors. I've made two purchases from www.vconsole.com over the last few years and both of those simulators have worked beautifully.
As I said earlier, there's never been a better time to add ISDN to your home lab. Don't just settle for trying to memorize theory - get your hands on the real deal, practice and fix your configurations, and you'll be amazed at what you learn and how well you do on your CCNA and CCNP exams!
About the Author
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of FREE CCNA & CCNP tutorials. For a FREE copy of my latest e-books, "How To Pass The CCNA" or "How To Pass The CCNP", request one at chris@thebryantadvantage.com!
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| Computer hardware - Wikipedia, the free encyclopedia |
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| Reg Hardware: Product News and Gadget Reviews from The Register |
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| A complete illustrated Guide to the PC Hardware |
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