There is a command line interface (CLI) that can be used to query operate or configure the device. The ASA software has a similar interface to the Cisco IOS software on routers. The names of firmware files includes a version indicator, -smp means it is for a symmetrical multiprocessor (and 64 bit architecture), and different parts also indicate if 3DES or AES is supported or not. The ROMMON also has a command line that can be used to load or select other software images and configurations. In the boot sequence a boot loader called ROMMON (ROM monitor) starts, loads a Linux kernel, which then loads the lina_monitor, which then loads lina. This schedules processes internally rather than using the Linux facilities. It runs a single Executable and Linkable Format program called lina. It’s typically placed in the forwarding path so that all packets have to be checked by the firewall, where we can drop or permit them. The firewall is the barrier between a trusted and untrusted network, often used between your LAN and WAN. Cisco ASA has become one of the most widely used firewall/VPN solutions for small to medium businesses.
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