Subnetting, VLSM and Cisco

Useful links on the subject:

 

http://www.subnettingquestions.com/

http://www.learntosubnet.com/

http://www.semsim.com/ccna/tutorial/subnetting/subnetting.html

http://www.tcpipguide.com/free/t_IPVariableLengthSubnetMaskingVLSM.htm

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800a67f5.shtml

http://www.techexams.net/forums/ccna-ccent/19607-vlsm-practice.html

http://fengnet.com/book/CCNA%20Portable/ch02lev1sec2.html

http://i.i.com.com/cnwk.1d/i/tr/downloads/home/1587201585_chapter_2.pdf

https://learningnetwork.cisco.com/thread/9674