Quality of Service (AI Song)

#AIart #AImusic #sunoai #Net+ #studyguide [Intro] Not all traffic is created equal on your network today A dropped email is annoying — a dropped VoIP call ruins the day When bandwidth is scarce and packets are fighting to get through QoS decides which traffic skips the line — and which one waits in queue [Chorus] Classify it, mark it, queue it right Voice and video need priority tonight DSCP bits in the IP header say what matters most DiffServ, LLQ, WRED — QoS from coast to coast Shape the traffic, police the rate, manage the congestion floor Quality of Service — giving critical traffic more [Verse 1] Best effort is no QoS at all — every packet treated the same First in, first out — FIFO — no priority, no special claim IntServ reserves bandwidth end to end with RSVP for every flow Too much state in the core to scale — IntServ doesn't grow DiffServ is the winner — mark packets at the edge and go Routers in the core just read the marking — no per-flow state to know [Chorus] Classify it, mark it, queue it right Voice and video need priority tonight DSCP bits in the IP header say what matters most DiffServ, LLQ, WRED — QoS from coast to coast Shape the traffic, police the rate, manage the congestion floor Quality of Service — giving critical traffic more [Verse 2] DSCP is six bits in the IP header's ToS byte Sixty-four possible values — zero through sixty-three in the fight EF is Expedited Forwarding — DSCP 46 — voice lives here AF is Assured Forwarding — four classes, three drop levels — crystal clear CS values map to old IP Precedence for backward compatibility Default forwarding is DSCP zero — best effort, no priority CoS is three bits inside the 802.1Q tag at Layer 2 Trust boundary at the access switch — where the network trusts what's true [Bridge] LLQ is Low Latency Queuing — strict priority queue served first always CBWFQ gives each traffic class guaranteed bandwidth — fair always Traffic shaping buffers excess and smooths the rate over time Traffic policing drops or re-marks packets that exceed the line Shaping is gentle — policing is strict — know which tool to choose WRED drops lower priority packets early so the queue never blows a fuse Tail drop hits everything at once — WRED keeps TCP from collapse Random early detection — probabilistic drops — before the buffer lapse [Chorus] Classify it, mark it, queue it right Voice and video need priority tonight DSCP bits in the IP header say what matters most DiffServ, LLQ, WRED — QoS from coast to coast Shape the traffic, police the rate, manage the congestion floor Quality of Service — giving critical traffic more [Outro] Voice needs under 150ms delay and jitter under 30 Less than one percent packet loss — keep the call quality sturdy Classify at the edge, mark with DSCP, queue with LLQ Quality of Service — making sure the right traffic gets through