Can QoS for a corporate environment be adjusted to prioritize traffic from SharePoint online so that improves user experience when uploading/downloading large files? My network team is telling me no because the SharePoint URL is outside the network. I am probably wrong but isn't QoS used for precisely prioritizing types of traffic for users? Thanks for helping me understand.
Thanks
QoS Implementation with SharePoint Online
qos
Best Answer
QoS is of no use if the traffic is going on the Internet, simply because almost no ISP is acting on QoS markings (in fact, it's normally stripped automatically when entering their network)
For QoS to be useful at all, all nodes in the path (routers, switches, etc) mustn't reset the marking and also must ACT on it (ie: if you have "DSCP EF" marking - normally used for Voice & Video, if the switch doesn't strip it but doesn't prioritize those packets, it doesn't help)
That is why your Network team told you that they can't do anything - unless there are some network bottleneck on your own network, if you go out the Internet where QoS isn't used, everything is "Best Effort" and every stream is (supposedly) treated equally (your Sharepoint traffic isn't more important to your provider than your're co-worker web requests).
Even if you had a special understanding with your provider, they're connected to others and so on and so forth, until you reach the Sharepoint servers. If any LINK used to reach those doesn't support QoS, then you have NONE.
TL;DR: QoS is NOT supported on the Internet at large