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Which of the following is not included in a server performance baseline?

  1. CPU utilization

  2. Disk transfer rate

  3. Network transmission speed

  4. OS update history

The correct answer is: OS update history

A performance baseline for a server typically includes metrics that directly reflect the operational efficiency and capacity of the server's hardware and its network environment. This encompasses aspects such as CPU utilization, which measures how effectively the server's processor is being used; disk transfer rate, which indicates the speed of data reading and writing on the disk; and network transmission speed, reflecting the rate at which data is transmitted across the network. OS update history, while important for maintaining system security and performance stability, does not encompass a direct measure of the server's performance at any given time. Instead, it documents changes made to the operating system that can affect performance but does not provide a quantitative measure that can be used to establish a baseline. Thus, the OS update history is not typically part of the performance metrics used to establish a server's performance baseline.