Which component includes PPTP and L2TP together with IPsec for VPN tunneling?

Which component includes PPTP and L2TP together with IPsec for VPN tunneling?

• A. Socks Proxy
• B. Anonymous Proxy
• C. Network Access Server (NAS)
• D. VPN protocol

Answer: (D)

VPN protocol is the mechanism that defines how a secure tunnel is built over a network. PPTP and L2TP are tunneling methods, and IPsec provides the encryption and authentication to protect the data inside those tunnels. When PPTP or L2TP is paired with IPsec, you get a secure VPN tunnel between client and server. The other options describe proxy services or devices, not the protocol that governs VPN tunneling.

VPN protocol is the mechanism that defines how a secure tunnel is built over a network. PPTP and L2TP are tunneling methods, and IPsec provides the encryption and authentication to protect the data inside those tunnels. When PPTP or L2TP is paired with IPsec, you get a secure VPN tunnel between client and server. The other options describe proxy services or devices, not the protocol that governs VPN tunneling.