Can an Ethernet network support quality of service?Can Ethernet networks support quality of service?Raw Ethernet networks do not provide quality of service (QoS) policy management controls directly.Ethernet QoS policy management can be provided through LAN switching equipment by using certain extensions to the Ethernet standard. The\u00a0802.1Q\u00a0Ethernet specification includes a tag, inserted into Ethernet frames, that defines\u00a0virtual LAN\u00a0membership. Three bits in this tag identify priority as defined by 802.1D (previously 802.1p) to provide for eight priority levels.Switches and routers can use the tag to give traffic precedence by queuing outgoing frames in multiple buffers. 802.1D provides\u00a0Differentiated-Services\u00a0functionality for Ethernet segments. Diff-Serv is an IETF specification that works at the network layer by altering the IP type-of-service field to identify particular classes of service. Diff-Serv is a class-of-service management scheme rather than a true QoS implementation.Other internetworking protocols available for supporting QoS are\u00a0Resource Reservation Protocol, used to reserve end-to-end network resources for a particular network flow (in one direction); Real-Time Transport Protocol, which is optimized to deliver real-time data such as audio and video streams through multiplexed\u00a0UDP\u00a0links;\u00a0IP Multicast; and\u00a0Multi-protocol Label Switching.