3.3 High Availability and Disaster Recovery Flashcards
In Load Balancing how are requests spread among devices on the network?
Client requests are spread from one active device to the next active device in an Active/Active system, or in the account of failover are sent from active device to passive device in a Active/Passive system.
Explain the three First Hop Redundancy Protocols (FHRP).
Hot Standby Router Protocol (HSRP):
Cisco proprietary
Routers running HSRP create a virtual router with a virtual MAC address
Gateway Load Balancing Protocol (GLBP):
Cisco proprietary
Virtual Router Redundancy Protocol (VRRP):
Standards based protocol
What is Mean Time Between Failure (MTBF)?
MTBF measures the reliability of a system or component.
What is Mean Time to Repair/Recovery (MTTR)?
How long, on average, will it take to repair a component that fails.
Time to recovery includes time for problem diagnosis and repair.
What is Recovery Time Objective (RTO)?
How long will it take for the system to be functional.
What is Recovery Point Objective (RPO)?
At what point (percentage) is the system considered functional.