Port mirroring is a feature available on the TEG-424WS enabling network traffic to be examined on one of the Ethernet ports by a network administrator. Transmit or receive (or both) data traffics can be duplicated to a designated port on the TEG-424WS. Network administrators can very easily monitor network performance or troubleshoot potential network issues using a protocol analyzer. Network administrators can choose one of the available ports to be the mirror port. The mirror port (or sniff port) can monitor another port or a group of ports on the Switch.