Regarding Fault Tolerance ASA provides 2 solutions: Active/Standby and Active/Active. Whereas Active/Standby is simple in use Active/Active provides not only redundancy but load sharing as well. On the other hand, requires more expansive license. Anyway, in this article we will compare them and see how to configure. 

Usually administrators focus more on threats that may come on WAN interface than LAN, what is understandable, cause we trust people that we work with. But sometimes it may be deceptive, especially if we administrate the network in rapidly changing environment (flow of people) with features like BYOD (Bring Your Own device) with no entire…