Which of the following protocols uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets?

Question

Options

• APPTP
• BESP
• CLWAPP
• DSSTP

• A
  89% (32)
• B
  3% (1)
• C
  6% (2)
• D
  3% (1)

Explanation

PPTP (Point-to-Point Tunneling Protocol) uses exactly this two-channel architecture: a TCP control channel on port 1723 for session management and a GRE (Generic Routing Encapsulation) tunnel to carry encapsulated PPP packets - making A the only correct match.

Why the distractors are wrong:

• ESP (Encapsulating Security Payload) is an IPsec protocol that encrypts packet payloads; it uses neither TCP control channels nor GRE.
• LWAPP (Lightweight Access Point Protocol) is a Cisco protocol for managing wireless access points - unrelated to VPN tunneling.
• SSTP (Secure Socket Tunneling Protocol) does use TCP, but tunnels PPP traffic over HTTPS (port 443), not GRE.

Memory tip: Think "PPTP = P(ort 1723) + P(PP) + T(unnel via GRE)" - the two P's remind you it wraps PPP packets, and the T is for the GRE Tunnel that carries them.

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