download it

http://www.pdfiles.com/pdf/files/English/Networking/Computer_Networking_A_Top-Down_Approach.pdf

Thanks for the book link but

I don't think we are using this book this quarter. Although the book title is similar, it is from a different author.

Computer Networks: A Top Down Approach” by Behrouz A. Forouzan

Not sure if the contents will be the same but better than nothing.