what are the threats to internet security of vpn?

VPNs require an in-depth understanding of public network security
issues and taking proper precautions in VPN deployment.

If a customer is truly concerned about security, they should consider
an IPSec VPN. IPSec provides an additional layer of protection by
using data encryption in addition to the tunneling provided by other
VPN mechanisms like MPLS. If a customer is using an MPLS VPN and their
provider's network is breached, the data can actually be readable and
usable. An IPSec VPN with built-in encryption technology will protect
critical data even if a network is compromised. While this may be
overkill for some, it's table-stakes for others.


Basically design the VPN to ensure all points are covered
security-wise. Then make sure there can be no breaches of security at
the other end as well.