Which of the following statements are true about IPsec VPNs? (Choose three.)
A. IPsec increases overhead and bandwidth.
B. IPsec operates at the layer 2 of the OSI model.
C. End-user’s network applications must be properly pre-configured to send traffic across the IPsec VPN.
D. IPsec protects upper layer protocols.
E. IPsec operates at the layer 3 of the OSI model.
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