Things are getting a bit heavy when you reach for a protocol analyzer, because this means that you’re checking out your network at a very fundamental level by analyzing individual data packets on the network. Software-based protocol or network analyzers (also called packet sniffers) include applications such as the Network Monitor (NetMon) provided with Windows Servers.
The CompTIA Network+ exam calls both protocol and network analyzing tools network sniffers.
Use these tools when unexplained slowdowns occur on your network to help you determine which machines are possibly sending rogue or malformed packets. ...