Which of the following protocols supports encapsulation of encrypted packets in secure wrappers that can be transmitted over a TCP/IP connection?

Question

Options

• APPTP
• BUDP
• CIPSec
• DPAP

• A
  86% (19)
• B
  5% (1)
• C
  9% (2)

Explanation

PPTP (Point-to-Point Tunneling Protocol) is specifically designed for VPN tunneling - it encapsulates PPP frames (which can carry encrypted data via MPPE) inside GRE packets and uses a TCP control channel (port 1723) to transmit them across a TCP/IP network, fitting the definition of wrapping packets in a secure tunnel for transmission.

Why the others are wrong:

• B. UDP is a basic transport-layer protocol for sending datagrams - it has no encryption, tunneling, or encapsulation capabilities on its own.
• C. IPSec does encrypt and protect packets, but it operates at Layer 3 (IP level) and doesn't inherently create a TCP/IP-based tunnel - it's often paired with L2TP to achieve tunneling, not standalone.
• D. PAP (Password Authentication Protocol) handles only credential authentication and transmits passwords in plaintext - it does no encryption or encapsulation whatsoever.

Memory tip: Think of PPTP as "Point-to-Point Tunneling" - the word "tunneling" is your clue that it wraps (encapsulates) traffic inside a secure tunnel for travel across a TCP/IP network, which is exactly what the question describes.

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