Answer:
failure to detect errors as they occur
single points of failure
failure to design for reliability
Step-by-step explanation:
When designing a data center, it is paramount that from the onset there must be high availability and there must be no single point of failure, as this can jeopardize all efforts put together to designing a data center. The presence of only one ISP connection is a failure to design for reliability, and as no one was monitoring the UPS is a failure to detect errors as they occur.