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Implementing Cisco Networking Solutions by Harpreet Singh

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Basic access control

These are access rules that are configured on the firewall to be applied to the traffic between the various security zones of the firewall. By default, the ASA allows traffic to flow freely from an inside network (higher security level) to an outside network (lower security level). These rules can limit traffic from inside to outside, or allow traffic from outside to inside, based on the tuple value (source address and port, destination address and port, and protocol). Next generation firewalls, commonly known as NGFW, allow IP addresses to be linked to the DHCP servers, Active Directory (AD) servers, and so on, to allow the creation of the tuples based on hostnames rather than IP addresses.

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