Access control list– network devices

The Access Control Lis(ACL) for network devices must not be confused with the ACL for files and folders, they are totally different. Two network devices that use ACL are firewalls and routers. The ACL prevents access by using port numbers, application names, or its Internet Protocol (IP) address. When you install a new firewall or router, there are no rules except the last rules of deny all. The default for either a router or firewall is to block all access allowed by creating exceptions using allow rules for the traffic you want to allow through. If there are no allow rules, the last rule of deny applies, this is called an Implicit Deny.


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