Which of the following protocols provides the highest level of VPN security with a VPN connection that uses the L2TP protocol?

Question

Options

• AIPSec
• BPPPoE
• CPPP
• DTFTP

• A
  84% (46)
• B
  5% (3)
• C
  9% (5)
• D
  2% (1)

Explanation

IPSec (A) is correct because L2TP alone provides no encryption - it relies entirely on IPSec to supply authentication, integrity, and encryption, making L2TP/IPSec the standard secure VPN combination used in enterprise environments.

PPPoE (B) is a tunneling protocol for delivering PPP frames over Ethernet networks (common with DSL), not a security protocol. PPP (C) is the underlying data-link protocol that L2TP encapsulates - it handles framing and authentication (PAP/CHAP) but provides no meaningful encryption for VPN traffic. TFTP (D) is a trivial file transfer protocol with no encryption or security features whatsoever, completely unrelated to VPN security.

Memory tip: Think "L2TP is the tunnel, IPSec is the lock" - L2TP digs the tunnel but leaves the door wide open; IPSec is what actually locks it with encryption and authentication.

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