Which VPN protocol natively encapsulates IPv4 and IPv6 traffic and provides confidentiality, integrity, and authentication using ESP?
A CISSP practice question covering Domain 4: Communication and Network Security. Try answering before reading the explanation below.
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Why "IPsec" is the right answer
IPsec uses ESP to provide encryption + integrity + authentication for both IPv4 and IPv6. PPTP is deprecated and weakly secured. L2TP itself has no encryption — it is paired with IPsec for security. GRE is a tunneling protocol with no built-in security.
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