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Santos:CCNA Sec 210-260 OCG by Omar Santos, John Stuppi

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Permitting Additional Access Through the Firewall

The permissions allowing traffic sourced on higher-security interfaces and being routed through egress interfaces with lower security levels are allowed by default, and the stateful nature of the ASA dynamically allows the return traffic. If you want to apply ACLs either to filter what the inside users can initiate or to permit access that allows users on the outside to reach our DMZ resources, you can use a packet-filtering ACL. To apply an ACL, navigate to Configuration > Firewall > Access Rules. By default, the policy on the inside and DMZ interfaces (because they are not at security level 0) is to allow traffic sourced by devices on those interfaces to be forwarded to less-secure networks. ...

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