NREN is using quality of service (QoS) to provide preferential service to specific applications or classes of applications. Also, NREN ensures that values of bandwidth, latency, jitter, and packet loss parameters stay within acceptable ranges. Furthermore, consistent latency and jitter reduction for specific applications is provided.

NREN is focusing on implementing DiffServ technologies across the NREN WAN. NREN has tested and implemented various queuing technologies with DiffServ.

QoS is benefiting NASA by satisfying various NASA mission application requirements. For example, perferred service and low latency data transfer have been requirements for the Estimating the Circulation and Climate of the Ocean (ECCO) and Aura Spacecraft testing applications.

At the 5th Space Internetworking Workshop in September 2006, A Preferred Service Architecture for Payload Data Flows presentation was given by NREN team members.

Quality of Service uses network queuing to separate and give preference to packets classified with high priority.