A WAN technician reviews activity and identifies newly installed hardware that is causing outages over an eight-hour period.
Which of the following should be considered FIRST?
Correct Answer: D
* A network performance baseline is a set of metrics that represents the normal operating state of a network. It can be used to measure the impact of changes, identify anomalies, and troubleshoot issues12.
* A WAN technician should consider the network performance baseline first when identifying newly installed hardware that is causing outages, because it can help determine what has changed and how it affects the network performance3.
* VLAN assignments, routing table, and device configuration review are also important factors to consider, but they are not the first step in troubleshooting. They can be used to verify the connectivity, routing, and configuration of the new hardware, but they do not provide a clear picture of the network performance before and after the change3.
References:
* CompTIA Network+ N10-008 Study Guide, Chapter 5: Network Monitoring and Troubleshooting, pages 248-249, 264-265.
* [Professor Messer's CompTIA N10-008 Network+ Course Notes], Section 5.1: Network Troubleshooting Methodology, pages 48-49.
* [Professor Messer's CompTIA N10-008 Network+ Training Course], Video 5.1: Network Troubleshooting Methodology, [6].