A technician has just installed a new SOHO router for several users to share an Internet connection. He received a call that, when one user streams media, the remaining user's browsing speed slows. What can the technician adjust, so the experience is universal for all users

The technician needs to adjust the quality of service tool.

Explanation:

Quality of Service (QoS) tool is a feature in  routers and switches which prioritizes traffic so that more important traffic can pass first which results in an improved performance for critical network traffic.

So whenever a complaint is made to the technician that a particular user is using much of the browsing speed which is slowing down the browsing speed of others,  The technician needs to adjust the Quality of Service tool of the router that allows the router to share the bandwith among users.