Can my employer see my traffic when I use the company VPN?

Partly, and it depends on the company's tools more than on the VPN. Traffic that goes through the VPN passes the company's network, so its firewall and monitoring can see which servers your laptop connects to and how much data flows. Most of that traffic is encrypted, so the content of web pages, messages and files is not visible to a network sensor unless the company runs a system that decrypts it, which your workplace policy should disclose. Software installed on a company laptop can see much more, which is why the laptop policy matters more than the VPN. Where NetSenX is used, it watches devices and connections, not people: it records connection metadata such as destinations, timing and volume to detect attacks, never decrypts traffic and never reads what you type. Ask your employer for its monitoring policy; in the EU, data protection law expects employers to tell staff how they are monitored.

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