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Free Online Cisco Lab
telnet 188.8.131.52 49001
telnet 184.108.40.206 49002
telnet 220.127.116.11 49003
telnet 18.104.22.168 49004
telnet 22.214.171.124 49005
telnet 126.96.36.199 49006
telnet 188.8.131.52 49007
telnet 184.108.40.206 49008
Special thanks to lanswitcher in providing such access.
For more info of rules in usage and network topology, check out the following link.
Free access to Cisco Catalyst switches to learn networking, Cisco IOS, and prepare for certification exams
Cisco Exam Preparation
(Or Anybody Who Likes To Know More Professionally of Cisco and/or IP Networking)
In addition of Exam Preparation, the links also provide good reading for those who like to have deeper understanding of various IP protocols and networking technologies.
Links courtesy of lanswitcher , PA23 , and rogunit .