High availability, redundancy, disaster recovery and business continuity

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Explain high-availability concepts and redundancy methods for devices, links, power, WAN connectivity, storage and services in enterprise networks.
Differentiate fault tolerance, high availability, load sharing, failover and resilience, and apply the correct term to a network design scenario.

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Interpret recovery objectives such as RTO and RPO and relate them to backup, replication and service-restoration strategies.

Identify environmental and facility considerations that support continuity, including redundant power, UPS, generators, HVAC, geographic diversity and carrier diversity.

Evaluate single points of failure in a network design and recommend operational or architectural changes to improve availability.

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