Which combination of IBM Cloud services would you use to design a fault-tolerant and highly available application? (Select two)

Question

Options

• AIBM Cloud Internet Services for global load balancing
• BIBM Cloud Virtual Private Cloud for network isolation
• CIBM Cloud Direct Link for private connectivity to IBM Cloud
• DIBM Cloud Functions for serverless computing

• A
  82% (28)
• C
  6% (2)
• D
  12% (4)

Explanation

IBM Cloud Internet Services (A) provides global load balancing, distributing traffic across multiple regions and automatically rerouting requests away from failed endpoints - a direct mechanism for both fault tolerance and high availability. IBM Cloud Virtual Private Cloud (B) enables network isolation with redundant subnets across availability zones, letting you architect multi-zone deployments that survive infrastructure failures without exposing resources to the public internet.

Why the distractors are wrong:

• C (Direct Link) provides reliable private connectivity to IBM Cloud, but it's a hybrid/on-premises connectivity solution - it doesn't make the application itself fault-tolerant or highly available.
• D (Cloud Functions) offers serverless scalability, but serverless alone doesn't guarantee HA architecture; it lacks the network-level redundancy and global traffic management needed for fault tolerance.

Memory tip: Think "HA needs two layers - traffic and network." Internet Services handles the traffic layer (global load balancing, failover), while VPC handles the network layer (isolated, multi-zone infrastructure). Direct Link and Functions are specialist tools that solve different problems (connectivity and compute, respectively), not HA by design.

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