Traffic from the same security level to the same level is denied by default.By default the appliances deny all traffic flows that originate from a lower security-level interface that are trying to reach a higher security level interface.Any other logical name defaults to 0, including “outside”. By default if you name an interface (using the nameif command) “inside” the security level defaults to 100. 0 to 100 with 0 being the least secure and 100 being the most secure. Security Level: each interface has a security level.The copy running-config startup-config is the same as the write memory command.Flash is commonly known as the running-config. On the security appliances, you have two locations for configuration file: Ram and Flash.SNR changes the Sequence Number when a TCP segment is heading out of the firewall. Sequence Number Randomization is a security feature that is used against TCP session hijacking.
Packet Firewalls are not they just look at the packets themselves. Stateful Firewalls are aware of the connections that pass through it.Within this table the stateful firewall holds information such as the Source IP, Destination IP, IP Protocol, and Port number. State Table is the same as a Connection Table.The main differences between a PIX and ASA: faster, more ports, switch built in, Cisco designed hardware architecture to allow faster processing, ASAs allow SSL VPNs.
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