The book in CIS656-102 is 

Forouzan, B.A.
TCP/IP Protocol Suite, third edition.
Mc Graw Hill 2006.
ISBN 0-07-296772-2

The NJIT bookstore has copies.

Students must have the third edition. 
Previous editions are really different.

This is the only compulsory book.

See the ``CIS 656 General Pages'' for other good books, 
for International Student Editions, for RFCs, etc.