A SaaS company's new service currently is being provided through four servers. The company's end users are having connection issues, which is affecting about 25% of the connections. Which of the following is most likely the root cause of this issue?
A.
The service is using round-robin load balancing through a DNS server with one server down.
B.
The service is using weighted load balancing with 40% of the traffic on server A, 20% on server B, 20% on server C, and server D is down.
C.
The service is using a least-connection load-balancing method with one server down.
D.
Load balancing is configured with a health check in front of these servers, and one of these servers is unavailable.
Comprehensive and Detailed Explanation From Exact Extract:
Round-robin DNS is a simplistic form of load balancing that does not perform health checks. If one of the four servers is down, DNS will still resolve its IP to 25% of users, resulting in failed connections. This matches the symptom of 25% failure rate — 1 out of 4.
Relevant Extract from CompTIA CloudNetX CNX-001 Study Guide — under “Load Balancing Techniques and Availability”:
“Round-robin DNS distributes requests without regard for health status. Without external health checks, failed servers will continue to receive traffic, leading to partial service disruptions.”
Other options:
B. The percentages do not align with a 25% failure rate.
C. Least-connection algorithms usually have integrated health checks.
D. If health checks are active, the load balancer would not forward requests to a failed server.
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