When using the default settings, which two events will cause an automatic failover to occur in an environment configured for high availability? (Choose two.)

Question

Options

• AThe BlackBerry Collaboration Service is unable to provide services for the collaboration client on the
• BThe BlackBerry Messaging Agent is unable to look up addresses in the address book
• CA preconfigured percentage of user accounts are not started in the BlackBerry Messaging Agent
• DThe BlackBerry MDS Integration Service is unable to provide application services
• EThe BlackBerry MDS Connection Service is unable to provide access from BlackBerry Java Applications

• A
  10% (4)
• B
  5% (2)
• C
  83% (35)
• D
  2% (1)

Explanation

In BlackBerry Enterprise Server (BES) high availability configurations, automatic failover is triggered by failures that indicate the primary server can no longer serve its core user base. Option C is correct because BES monitors the percentage of user accounts successfully started in the BlackBerry Messaging Agent - if that percentage drops below the preconfigured threshold, it signals a systemic failure warranting failover. Option E is correct because the MDS Connection Service is the critical gateway for BlackBerry Java Application connectivity; if it cannot provide access, a core device function is broken and failover is triggered.

The distractors represent non-critical or partial failures. Option A (Collaboration Service) and Option D (MDS Integration Service) involve ancillary or enterprise-app services that don't meet the default failover threshold - they degrade specific features but don't cripple core BES operation. Option B (address book lookup failure) is a transient, non-critical lookup issue and does not indicate server-level failure.

Memory tip: Think "users and connections." Failover fires when users can't start (C - percentage threshold) or apps can't connect (E - MDS Connection Service). The key trap is confusing MDS Connection Service (E, triggers failover) with MDS Integration Service (D, does not) - remember: "Connection = Critical."

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