Here are some suggested sites that will be helpful in your course
Network
http://www.globalstrata.com/services/network/calculators/bscnetcalc.asp IP Network Calculator
http://www.globalstrata.com/services/network/calculators/advnetcalc.asp Network Calculator
http://highered.mcgraw-hill.com/sites/0072515848/sitemap.html Data Communications and Networking
Programming language
http://www.cplusplus.com/doc/ C++ Documentation
http://webdeveloper.econsultant.com/cheat-sheets/ Top 119 Cheat Sheets
http://whatis.techtarget.com/definition/0,,sid9_gci826135,00.html Favorite Cheat Sheets for IT
English
http://www.englishjet.com/english_courses_files/tests.htm
Online English lessons exercises tests and quizzes