High availability and fault tolerance

- [Narrator] We've already discussed some of the ways … that security professionals can ensure … the continued operation of systems. … Let's dig into this in a little more detail. … There are two key technical concepts that improve … the availability of systems. … High availability, otherwise known as HA, … uses multiple systems to protect against failures. … HA techniques are like the ones we discussed … in the previous video, … having a cluster of web servers in place … that can continue to operate even if a single server fails … is one example. … Another is using a pair of firewalls … with one designated as the backup. … The core concept of high availability … is having operationally redundant systems … sometimes at different sites. … The geographic dispersal of placing systems … in different locations protects you against damage … to a facility. … Fault tolerance or FT helps protect a single system … from failing in the first place by making it resilient … in the face of technical failures. …