Which of the following counters used to monitor for network interface bottlenecks, should you use to monitor the performance of the network adapter?

A.
Packets Outbound Discarded.

B.
Output Queue Length.

C.
Bytes Total/sec.

D.
Current Bandwidth.

Explanation:
If you want to monitor the performance of the network adapter, use the Bytes Total/sec counter.
Incorrect Answers:
A: The Packets Outbound Discarded counter can be used to determine whether network saturation conditions are present.
B: You should use the Output Queue Length counter to ascertain what the length of the output packet queue is.
D: Use the Current Bandwidth counter if you want an indication of the maximum transfer rate of the network.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 534-536.