Given the requirements in the scenario, which Disaster Recovery configuration is the most advantageous for the BlackBerry device users in this environment? (Choose one)

Question

Options

• AInstall a standby server for the BlackBerry Enterprise Server in London and two standby servers for the
• BInstall a standby server in Vancouver for the BlackBerry Enterprise Server in New York and a standby
• CInstall both standby servers for both BlackBerry Enterprise Server instances in New York
• DInstall a standby server for the BlackBerry Enterprise Server in Los Angeles and a standby server for
• EInstall a standby server in Los Angeles for the BlackBerry Enterprise Server in London and a standby

• B
  82% (18)
• C
  5% (1)
• D
  5% (1)
• E
  9% (2)

Explanation

Option B is correct because it places the standby server for the New York BlackBerry Enterprise Server (BES) in Vancouver - a geographically distant location - ensuring that a regional disaster (power outage, natural disaster, network failure) affecting New York won't simultaneously knock out both the primary and standby servers.

Why the distractors fail:

• A places a standby server in London for the London BES, meaning both servers share the same geographic risk - defeating the purpose of DR.
• C co-locates both standby servers in New York, which protects neither BES from a city-wide or regional outage affecting New York.
• D & E may pair the wrong standby locations to the wrong primary servers, violating the core principle that each standby must be geographically separated from its own primary.

Memory tip: Think of DR as the "don't put your eggs in one basket" rule - a standby server in the same city as its primary is just an expensive duplicate, not true disaster recovery. For BES specifically, cross-region pairing (e.g., East Coast primary → West Coast/Canada standby) is the gold standard.

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