A hot site is a fully operational backup facility with hardware, network, and data synchronization already in place. It allows for immediate failover in the event of a disaster, minimizing downtime.
B: DCI (Data Center Interconnect) connects data centers but doesn't guarantee availability unless built redundantly.
C: Direct Connect refers to a private link to cloud providers, not disaster recovery.
D: Active-passive can help with failover but may involve delay unless combined with hot site principles.
# Reference:
CompTIA Network+ N10-009 Official Objectives: 4.4 - Summarize business continuity and disaster recovery concepts.