Foundation Topics

ACLs tell the router which traffic to allow and which traffic to deny. They can be configured to be general or specific. Unused but enabled services on routers represent a potential vulnerability for your network. Every network is unique, and therefore, every network requires a different type of configuration on its routers. This chapter covers some of the Cisco IOS Software services that should be turned off in most network settings to prevent security breaches or network downtime. It also discusses some commonly configured management services and how to securely operate them.

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