Which of the following is a network diagnostic tool that monitors and records network information?

A.
Online monitor

B.
Downtime report

C.
Help desk report

D.
Protocol analyzer

Explanation:
Protocol analyzers are network diagnostic tools that monitor and record network information from packets
traveling in the link to which the analyzer is attached. Online monitors (choice A) measure telecommunications
transmissions and determine whether transmissions were accurate and complete. Downtime reports (choice B)
track the availability of telecommunication lines and circuits. Help desk reports (choice C) are prepared by the
help desk, which is staffed or supported by IS technical support personnel trained to handle problems occurring
during the course of IS operations.