CCNA
1- computernetworkingnotes 2- http://www.9tut.com/category/ccna-lab-challenges 3- https://www.subnetting.net/ 4- http://hackingcisco.blogspot.com/ 5- https://www.nybi.org/subnet-2.php 6- http://networkerinterview.net/ccna 7- http://labs.ine.com/workbook/toc/ccna-rs-workbook 8- https://www.freeccnaworkbook.com/workbooks/ccna 9- https://www.certificationkits.com/ 10- http://labit501.upct.es/~fburrull/docencia/CCNA/en_SwiN_Lab_ILM.pdf 11- http://www.omnisecu.com/tcpip/address-resolution-protocol-arp.php 12- http://www.tcpipguide.com/free/t_toc.htm 13- http://www.networksorcery.com/enp/protocol/ip.htm 14- CCNA & CCNP LAB 15- ipaddressguide calc 16- besthinditutorials.com 17- howdoesinternetwork 18- guides/bgp.pdf 19- nterprisenetworkingplanet.com 20- http://www.networklab.in/downloads/