Network emulators are devices that simulate computer network specifications that affect application performance. The emulator is introduced into a LAN and will alter packet flow to provide a trial of typical application processes. A guest computer network's functions are emulated on a host computer network, and the guest's functions closely resemble that of the real system. Emulators maintain the integrity of the guest network, while allowing testing of an emulated network's, link speed, available bandwidth, latency, jitter, packet loss/erroring, quality of service handling, and packet reordering. The emulator can be computer running network emulation software, or a devoted emulation device. This is regularly used for cloud networks, wide area networks, satellite networks, radio networks, and mobile networks.