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I am new to CCNA and I want to know or watch a video perhaps how a serial link cable is connected to a serial link/line of a router, is there any cable available perhaps to connect 2 of my cisco 2600 router to simulate a serial connection?

I just found a good software for checking the result during learning subnet or subnetting of CCNA.
It is a free software for iphone or ipad. And it is also a good software during daily work.
Apple Store link:

copy from

Hi guys can anyone tell me where i can find CCNA Discovery & Exploration slides any suggestion will be highly appreciated.

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the locally configured subnet mask

obtained 945/1000
passing score 804
Duration: 90 mins
study material: certifyme study guide.
thanks a lot to every one

how i can rent my CCNA cert ???