101 · Question #655

101 Question #655: Real Exam Question with Answer & Explanation

The correct answer is C: IPSec AH. IPSec Authentication Header (AH) authenticates and verifies the integrity of IP traffic without encrypting the payload, satisfying the requirement for authentication without encryption.

Section 4: Security Basics

Question

Which protocol Authenticates network traffic between hosts end without encryption?

Options

APPTP
BGRE
CIPSec AH
DiPSec ESP

Explanation

IPSec Authentication Header (AH) authenticates and verifies the integrity of IP traffic without encrypting the payload, satisfying the requirement for authentication without encryption.

Common mistakes.

A. PPTP encapsulates PPP frames and typically uses MPPE encryption, providing tunneling with encryption rather than authentication alone.
B. GRE is a tunneling protocol that provides neither authentication nor encryption of traffic by default.
D. IPSec ESP provides both confidentiality through encryption and optional authentication, so it does not satisfy the requirement of authentication without encryption.

Concept tested. IPSec AH provides authentication without encryption

Reference. https://www.rfc-editor.org/rfc/rfc4302

Topics

#IPSec AH#authentication#no encryption#VPN protocols

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