A corporation has a single-site ECS system and is contemplating implementing a three-site Geo Federated environment. They want to know what benefits Geo replication offers. Which two benefits can a…

Question

Options

• AProvides improved security against site failures by creating multiple copies of the data
• BReplication group creation without VDC Federation
• CReduces indexing overhead by increasing the number of replication groups
• DStorage efficiency by taking advantage of XOR compression

• A
  88% (30)
• B
  9% (3)
• C
  3% (1)

Explanation

Geo replication across three sites provides genuine resilience (A) because data chunks are distributed and replicated across geographically separate locations, so a single site failure doesn't cause data loss or unavailability. It also offers storage efficiency (D) by using XOR-based erasure coding across sites - rather than storing full copies at each location, parity information is spread across sites, consuming significantly less raw capacity than traditional mirroring.

Option B is wrong because VDC (Virtual Data Center) Federation is actually required to create replication groups in a Geo Federated ECS environment - you cannot bypass it. Option C is wrong because adding more replication groups does not reduce indexing overhead; if anything, it adds management complexity rather than reducing processing burden.

Memory tip: Think of Geo Federation's two wins as "Survive + Save" - Survive site failures (A) and Save storage via XOR erasure coding (D). If an option claims Geo Federation removes a core dependency (like VDC Federation) or magically reduces overhead by adding complexity, it's a trap.

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