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Fault Tolerance and Common Access Redundancy Protocol (CARP) This lesson discusses methods which are necessary to maintain a high uptime in a network. Uptime is the time that services are available on a network. This lesson focuses on the methods of fault tolerance and Common Access Redundancy Protocol (CARP). Fault tolerance is essentially the act of having fail over devices available, preferably thee devices are automatic such as routers, switches and cables. In CARP, multiple hosts share the IP. CARP allows for transparent fault tolerance and each device has a shared IP and personal management IP. CARP can be fail over or load balance.