In one embodiment, a processor-readable medium storing code representing instructions that when executed by a processor cause the processor to store a set of stream signatures representing a set of test streams. The code can be configured to cause the processor to receive at a test device a stream signature from a test packet after the test packet has been processed at a device-under-test. The test packet can emulate at least a portion of network traffic. The code can also be configured to cause the processor to define an indicator representing that the test packet is from a new test stream when the stream signature from the test packet is different than each stream signature from the set of stream signatures. The new test stream is excluded from the set of test streams.