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.
Answer: A.
When using basic round‐robin DNS load balancing (without a proper health check mechanism), if one out of four servers is down, roughly 25% of the DNS responses will direct users to the offline server—causing 25% of the connections to fail.
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SuntzuLegacy
1 month, 1 week ago