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Authentication using preshared keys (VPN)

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Some VPN protocols assume authentication using preshared keys. I googled a lot and many sources testified that this authentication method is not secure. What is the major drawback of this authentication method? Does it depend on protocol (L2TP/IPSec, IKEv2, OpenVPN)? How secure is IKEv2 without certificates? I can verify my TLS connection using browser (view certificates, signatures, path, expiration dates etc.). How can i verify my VPN connection (IKEv2) (correct authentication, not corrupted)?

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