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If the traffic matches one of the rules, no other rule is matched and the matched rule is executed.īy default, ASA performs stateful tracking of the packet if the packet is generated from a higher security level to a lower security level.īy default, if the traffic is initiated by the devices in higher security levels for lower security levels device (as destination), TCP and UDP reply traffic will be allowed and will able to, say, telnet the other device in Lower security level. It consists of various permit or denies conditions. Packet filtering is a simple process of filtering the incoming or outgoing packet on the basis of rules defined on the ACL which has been applied to the device. Cisco calls its firewall Adaptive Security Appliance (ASA).Ĭisco ASA 5505, Cisco ASA 5510, Cisco ASA 5515-X, Cisco ASA 5520, Cisco ASA 5525-X, Cisco ASA 5540, Cisco ASA 5550, Cisco ASA 5555-X, Cisco ASA 5585-X.ĪSA is a Cisco security device that can perform basic firewall capabilities with VPN capabilities, antivirus, and many other features.