Question about ISDN/DDR

kadshah

My router doesn't support isdn commands and neither does my RouterSim so there's no way for me to practice. What is the best way to prepare for the ISDN/DDR section of the exam just memorize the commands? I'm having a hard time understanding and memorizing the DDR commands.

steve-o87

I bought an ISDN simulator off of Ebay. There wasn't really much ISDN covered on my exam (I think I got 1 question) but that doesn't mean dont learn it but I dont think you need to fret too much.

Your best bet is buy an ISDN sim for any serious practice.

Good luck!

wildfire

My router doesn't support isdn commands

This might sound a silly Q but does your router have an ISDN interface?

for the ISDN part you could either buy an ISDN sim, or use a free rack rental service like my own, or free-labs.com to cover the bits your lab doesnt do.

Netwurk

If you need a router that supports ISDN, a 2516 is probably your best bet. They have BR i/f's and don't need transceivers since they come with a built-in hub. You'll need two of them if you want to hook up a simulator. They usually go for $15-25 each on ebay.

A 2-port ISDN simulator on ebay usually sells for around $250 or more. I got mine for $150, but it took six months waitng for a good deal to come along.

Good luck with your lab/studies!

kadshah

maybe i'll look into a rack rental service i don't want to go out and buy
a router at this point cause i'll be taking the exam next week.
I already memorized most of the commands to setup an ISDN
I just wanted to practice a little. The DDR commands and concept
haven't sunk in yet, hopefully I'll get that together by next week.
Thanks for your help.