Wide Area Network Emulators, or WANem, are designed to simulate WAN connections for use in laboratory settings, and makes for a good delay simulator as well.
By calculating the interactions between different network entities, WAN emulation creates artificial delay, bandwidth constraints and other impediments and functions.
This functions as a way to gauge applications and protocols against actual conditions. WAN characteristics like packet loss, disconnections, jitter, and time delay can be mimicked over a transparent application gateway with a WANem. This unique test condition allows users to bring the internet into their development, laboratory or test environment.