Yves Lepage has authored or contributed to a number of books on networking-related topics, given networking presentations to IT professionals, and taught UNIX seminars. As an experienced UNIX network administrator, he has obtained a great deal of hands-on UNIX networking mastery while working with the McGill University network in Montreal, Canada. Paul Iarrera is an information systems consultant working in the financial and communications industries. He has written course materials, and provided hands-on UNIX systems management training for IT professionals in the corporate environment. His experience implementing UNIX solutions for enterprise-level computing affords him knowledge and expertise in-depth UNIX systems integration.