Employee Mobile Phone MAC Address exclusions
Hi @Vanessa W
A MAC address is never communicated to the browser, so it's not possible (even if you wanted to) to log the MAC address in Google Analytics.
An alternative option is to filter based on IP (but those change on mobile phones unless connected to fixed IP corporate network for instance).
If employees often visit very specific pages (e.g. pages behind an employee login), you could setup a custom dimension to log those visits on user level and set the dimension value to "employee". Then you'd be able to create a filter excluding those visits.