If I were to briefly connect to a network for like 2 mins would they be able to see everything i've browsed from my home network? If they knew my mac address?
Sounds like a stupid question but am not tech savvy.
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It depends, but the answer is generally NO.
First, I will pinpoint your question (as it follow from comments):
I use my laptop both at home and at work. In both cases I connect to to the network (and - possibly to the Internet) by its WiFi adapter, so in both networks I have the same MAC address.
Is it possible for my employer to use my connection to the business network to obtain info about my previous activities within my home network?
If you have no publicly shared folders and your employer don't employ (illegal) sophisticated hacker activities to obtain access to your computer, the answer is NO.
It is your computer and you control, whom, when, and how will be allowed the access to the (part) of your stored data (including your browser history).