What transport layer is PPTP, SSTP?

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Multiple Choice

What transport layer is PPTP, SSTP?

Explanation:
PPTP and SSTP hinge on the Transport layer because their setup and control messages ride on top of TCP (and in SSTP’s case, TLS over TCP). The Transport layer provides reliable, connection-oriented delivery between endpoints, which is exactly what these VPN protocols need to establish and manage a tunnel. PPTP uses a TCP control channel (with GRE carrying the actual data), while SSTP encapsulates PPP in an SSL/TLS session over TCP. So, the essential role of these protocols is at the Transport layer, even though some parts of their data path may interact with other layers for encapsulation.

PPTP and SSTP hinge on the Transport layer because their setup and control messages ride on top of TCP (and in SSTP’s case, TLS over TCP). The Transport layer provides reliable, connection-oriented delivery between endpoints, which is exactly what these VPN protocols need to establish and manage a tunnel. PPTP uses a TCP control channel (with GRE carrying the actual data), while SSTP encapsulates PPP in an SSL/TLS session over TCP. So, the essential role of these protocols is at the Transport layer, even though some parts of their data path may interact with other layers for encapsulation.

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