There are several subjects in this topic.Access Control Lists, Mnagement Plane Security.
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Securing MAC Access
Today’s foundamental topcis would be Port Security Using MAC Address,Port-based Security Using IEEE 802.1x, Mitigating Spoofing Attacks.
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Switch Security
For example, you should strongly consider disabling the HTTP server on a Catalyst switch. This often is used for a web-based switch-management tool but is usually unneeded in a production environment. You can disable it with the no ip http server configuration command.
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NAT configuration
Today, we are gonna play with all nat mode like static nat, port nat, nat with route-map. Tomorrow, we are gonna mainly focus on DHCP. The day after tomorrow is gonna be some security stuff.
enterprise and ISP BGP setup
I would explain the detail of it later.