Unidirectional streams can be seen with an inline fiber tap. Some taps are designed with one inlet and two outlet network cards, one for transmit and one for receive. In this case, a multi-NIC monitor, such as CA ADA Multi-Port Monitor, is required for CA ADA to accurately account for the traffic.
In an asymmetric routing environment, one core switch routes data into the data center. A different core switch routes traffic that exits the data center. Two port mirrors to the same monitor are required to capture the transmit and receive traffic for the server farm.
The CA Standard Monitor cannot monitor unidirectional or asymmetric traffic.
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