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Vlan Isolation
Loopback Detection
* Tail Latency
200ms latency -> initial rto
exponential backoff rto -> 400ms, 800ms, 1000ms
congestion, pathmtu not honored, icmp rate-limited, reply pathmtud-reply packets dropped,
os issues -> Zero window -> cpu high(response slow), memory high, disk issue
*4k video file edit latency
RTP uses tcp, n/w level issues, check latency on which side traces,
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