TCP/IP Protocol Suite, 3/e Forouzan - McGraw Hill The third edition has transitioned from using the 7-layer OSI model to the 5-layer Internet Model. More time is spent on TCP/IP in the new organization. Forouzan's book continues to be supported by an On-line Learning Center (OLC) that contains many extra resources for students and instructors. Here is the link for TCP/IP Protocol suite by Forouzan Solution Manual both 3rd and 4th edition It contains the chapter wise solution of every example from 3rd edition.