Editing Quality of service (section)

===Protocols===
Several QoS mechanisms and schemes exist for IP networking.
*The [[type of service]] (ToS) field in the [[IPv4 header]] (now superseded by [[DiffServ]])
*[[Differentiated services]] (DiffServ)
*[[Integrated services]] (IntServ)
*[[Resource Reservation Protocol]] (RSVP)
*[[RSVP-TE]]

QoS capabilities are available in the following network technologies.
*[[Multiprotocol Label Switching]] (MPLS) provides eight QoS classes<ref>{{cite web|title=VoIP on MPLS|url=http://searchunifiedcommunications.techtarget.com/tutorial/VoIP-on-MPLS|publisher=Search Unified Communications|access-date=12 March 2012}}</ref>
*[[Frame Relay]]
*[[X.25]]
*Some [[DSL modem]]s
*ATM
*[[Ethernet]] supporting [[IEEE 802.1Q]] with [[Audio Video Bridging]] and [[Time-Sensitive Networking]]
*[[Wi-Fi]] supporting [[IEEE 802.11e]]
*[[HomePNA]] home networking over coax and phone wires
*The [[G.hn]] home networking standard provides QoS by means of ''contention-free transmission opportunities'' (CFTXOPs) which are allocated to flows which require QoS and which have negotiated a contract with the network controller. G.hn also supports non-QoS operation by means of contention-based time slots.