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Difficulty: MediumResilience, High Availability, and Redundancy

Match each resilience and redundancy mechanism on the left with the corresponding operational requirement or architecture scenario on the right.

  • Automatic Transfer Switch (ATS)Delivers continuous utility power to single-corded server equipment by seamlessly transferring electrical loads between primary and backup PDUs.
  • Geographic Asynchronous ReplicationMaintains data availability across distant data centers while accepting a non-zero Recovery Point Objective (RPO) to avoid latency penalties.
  • Multipath I/O (MPIO)Prevents storage access disruption at the server level by aggregating redundant Host Bus Adapter physical paths to a SAN storage array.
  • Dynamic BGP MultihomingReroutes enterprise boundary traffic across multiple ISP links dynamically upon detecting an upstream edge link outage.

Answer

The correct pairings match Automatic Transfer Switch (ATS) to single-corded utility power delivery via seamlessly transferred electrical loads; Geographic Asynchronous Replication to maintaining distant data availability with a non-zero RPO; Multipath I/O (MPIO) to storage access path aggregation over redundant HBAs; and Dynamic BGP Multihoming to enterprise boundary traffic rerouting across multiple ISP links.
Each redundancy technology directly targets a specific physical or logical component failure domain: ATS addresses single-corded power feed failure, MPIO addresses storage channel and HBA adapter failure, BGP multihoming addresses WAN ISP link failure, and Asynchronous Replication addresses regional datacenter failure without application performance degradation.

Step-by-Step Solution

1
Analyze power redundancy requirements for single-corded hardware.
An Automatic Transfer Switch (ATS) is required to feed single-corded appliances from redundant PDUs without power interruption.
ATS handles power source failover at the rack level when a PDU or utility feed loses power.
2
Evaluate long-distance database disaster recovery methods.
Geographic Asynchronous Replication allows cross-datacenter sync over WAN without local commit latency constraints.
Asynchronous replication tolerates network latency across geographic sites while accepting a minor RPO delta.
3
Assess host-to-SAN storage link redundancy.
Multipath I/O (MPIO) aggregates multiple Host Bus Adapter (HBA) paths into a redundant logical channel.
MPIO protects host storage connectivity against individual HBA, cable, or fiber channel switch failures.
4
Examine WAN perimeter network resilience.
Dynamic BGP Multihoming maintains network connectivity across independent Internet service provider links.
BGP detects link failure and updates routing tables to direct inbound and outbound traffic over functional paths.

Key Concept

High Availability and Infrastructure Redundancy Controls
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Topics

Resilience, High Availability, and Redundancy

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