| QoS | Quality of Service. Network traffic is comprised of multiple streams of related packets, for example a file transfer via the FTP protocol and a TN3270 interactive session with an IBM AS/400. QoS facilities are designed to allow network administrators to set traffic priorities, so that, in our example, a large FTP transfer would not create undesirable delays and slowness in AS/400 interactive sessions. QoS facilities on IP networks have excellent ability to enforce priorities on traffic sent and limited ability on traffic received. Therefore, the most effective QoS is on network paths were all participating endpoints can enforce policies on transmission, such as an a VPN connection between two offices.
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