Instructor materials Professor Comer uses Computer Networks and Internets in his course CS 422, Computer Networks, at Purdue University.  The course notes for CS 422 are available in PDF (820KB) and PostScript (1.67MB) format. A printable version (770KB) of the notes in PDF is also available. Another set of lecture notes, prepared by Lami Kaya, are available in PDF and PowerPoint format.