We display and report network traffic in bytes per second.
The Network traffic chart can be found by clicking the Details button on the server of interest. You'll find it immediately under the CPU chart.
The units on the y-axis will depend on the amount of traffic recorded during the time covered by the chart. Most often it will be KB/s, (Kilobytes per second); it could alternatively be displayed in MB/s or B/s (Megabytes per second, or Bytes per second).
Tip: KB/s is the common notation for Kilobytes per second; Kb/s is the notation used for Kilobits per second.