For an e-business that requires high availability, which of the following design principles is BEST?

Question

Options

• AA single point of entry allowing transactions to be received and processed quickly
• BManual failover to the website of another e-business that meets the user's needs
• CIntelligent middleware to direct transactions from a downed system to an alternative
• DAvailability of an adjacent cold site and a standby server with mirrored copies of critical data

• A
  14% (5)
• B
  3% (1)
• C
  74% (26)
• D
  9% (3)

Explanation

Intelligent middleware that automatically redirects transactions from a failed system to an alternative provides seamless, real-time failover without user intervention - directly achieving high availability. A single point of entry (A) is a single point of failure, which is the opposite of a high-availability design. Manual failover (B) introduces human delay and is unsuitable for systems requiring continuous availability. A cold site with a standby server (D) requires manual activation and significant startup time, making it appropriate for disaster recovery but not for high availability where near-zero downtime is required. Automated, intelligent failover through middleware is the only option that satisfies continuous availability requirements.

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