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About GNS labs for cisco router, switch, firewalls

  • How to build switch image and configure switch in GNS 3
  • Add router image to the GNS3
  • Connect Virtual Machine to Internet Via GNS3

IOS download: http://tfr.org

CIDR calculator

Type a network address with mask length to find the subnet mask, network info (available IPs, first IP, last IP, etc)


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