Hi
Basically the CCENT is the same ICND1, the CCNA exam can be taken or 1 exam or divided it into 2 exam (ICDN1 and ICDN2). Basically in this modality the topics are divided not by semester but by topics load and in this way it keeps an order. The routing protocols are delivered on the ICND2.
https://learningnetwork.cisco.com/community/certifications/ccna
http://www.cisco.com/c/en/us/training-events/training-certifications/certifications/entry/ccent.html
I recommend this study material:
http://www.ciscopress.com/search/index.asp?query=icdn1
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