DDR ?

Just wondering if the exam covers this topic. I've been using Todds CCCNA study guide along with cbt nugget video to prepare for the exam
and CCNA by cisco press
but there's no info on the video that covers DDR and i'm having trouble understanding this topic in Todd's book (4th Ed) Is this topic heavily drilled on in the CCNA exam? I already read through the ISDN and have memorized just about every command and concept but the DDR is still unclear to me.

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forbesl

kadshah wrote:

I already read through the ISDN and have memorized just about every command and concept but the DDR is still unclear to me.

http://www.netcraftsmen.net/welcher/papers/ddr.htm

http://www.networkingunlimited.com/white004.html

kadshah

beautiful thanks. i was getting tired of scratching my head.

-k

forbesl

Here's another couple:

http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2010.htm

http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2015.htm