How do we know a former employee's device is no longer on our network?
By checking which devices actually connect, not only which accounts were closed. Offboarding usually removes the user account and collects the laptop, but an unreturned laptop, a personal phone with saved Wi-Fi credentials or a forgotten remote-access tool can keep connecting. Compare your list of returned devices with the devices seen on the network after the leaving date, change any shared Wi-Fi and VPN credentials the person knew, and revoke certificates issued to their devices. On every plan, the NetSenX network map lists the devices seen on monitored segments, with the name each device announces and when it was first and last seen. NetSenX does not know who left the company: HR and IT decide that, and the network view shows whether the door actually closed.
General information, not legal advice. National laws can add to the EU texts quoted here, for example deadlines, forms or reporting channels: check your own country's rules.
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