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ISDN is a vital subject for today's CCNA and CCNP candidates, especially for the ICND and Intro exams - you've got to learn ISDN inside and out to pass those exams. Obviously you want to include it in your house lab. What several individuals don't know is that you can not link two Cisco routers directly via their Basic Rate Interface (BRI) interfaces you have got to have another unit between them called an ISDN simulator. An ISDN simulation is not one of those software programs pretending to-be routers (~~'~ modem simulators ~'~~) it is a bit of hardware that acts because the telephone company at home lab. Computer Flight Simulator Controls is a great online database for more concerning where to look at this idea. Older simulators come with SPIDs and preprogrammed phone numbers, where newer types let you plan the phone numbers you need to use. In either case, an ISDN simulation is great for your CCNA/CCNP house research, since you can practice switch situations that truly work. And you get to troubleshoot the ones that don't, which will be also very important to understand! ) You do not need any special cables or connectors you just join both of the routers' BRI interfaces to the ISDN simulator having a straight-through cable and you're all set. In years past, it was a problem for 640-801, 811, and 821 studies, since the simulators used-to be so costly. New ones can still be dear ($600 and up), but with the sudden increase of used ISDN simulators on ebay and Cisco shops, you can get an used one which will do the job for you. Why are there suddenly a lot of ISDN simulators available on the market? Cisco recently eliminated ISDN from the CCIE R&S test, so lots of private individuals as well as CCIE sheet re-sellers are selling their simulators. Visit fsx flight controls to compare how to do this concept. There is never been a much better time-to increase ISDN to your residence lab. They can last for many years, if taken care of (kept from excessive heat). Visiting flight simulation training certainly provides suggestions you can use with your mom. The main one I purchased for my IE house research continues to be working well. Dig up new info on a partner web resource by visiting purchase here. You can run a Google search to locate vendors, if you decide to buy a new simulator. I've made two purchases from www.vconsole.com during the last several years and both of these simulators have worked beautifully. When I said earlier, there is never been a better time-to increase ISDN to your residence lab. Don't just be satisfied with looking to memorize theory - get your hands on the real thing, practice and fix your configurations, and you'll be astonished at what you learn and how well you do on your CCNA and CCNP exams!.GOFlight Technologies 163 SW Freeman Ave Hillsboro, OR 97123 (503) 895-0242