How to check VPN?

Question

VPN

Let's say I'm using a mobile device that has a VPN configured (eg ViPNet mobile), how can I check that the traffic is really secure? those. I'm assuming that I'm in close proximity with an attacker (traffic goes outside the controlled zone), he intercepts the traffic. Question 1. How will he do it (software and hardware, details)? Question 2. How realistic will he be able to decrypt the traffic?

Answer 1

https://whoer.net/ru