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NSE4 · Question #543

An administrator has configured a dialup IPsec VPN with XAuth. Which method statement best describes this scenario?

The correct answer is B. Dialup clients must provide a username and password for authentication. An IPsec dialup VPN configured with XAuth requires clients to provide an additional username and password for authentication, supplementing the standard Phase 1 authentication.

Submitted by andreas_gr· Apr 18, 2026VPN and Routing

Question

An administrator has configured a dialup IPsec VPN with XAuth. Which method statement best describes this scenario?

Options

  • AOnly digital certificates will be accepted as an authentication method in phase 1.
  • BDialup clients must provide a username and password for authentication.
  • CPhase 1 negotiations will skip pre-shared key exchange.
  • DDialup clients must provide their local ID during phase 2 negotiations.

How the community answered

(47 responses)
  • A
    2% (1)
  • B
    89% (42)
  • C
    2% (1)
  • D
    6% (3)

Why each option

An IPsec dialup VPN configured with XAuth requires clients to provide an additional username and password for authentication, supplementing the standard Phase 1 authentication.

AOnly digital certificates will be accepted as an authentication method in phase 1.

XAuth is a supplementary authentication method and does not limit Phase 1 authentication exclusively to digital certificates; Phase 1 can still use pre-shared keys or certificates.

BDialup clients must provide a username and password for authentication.Correct

XAuth (Extended Authentication) adds an extra layer of authentication to IPsec VPNs, compelling dialup clients to furnish a username and password after Phase 1 negotiation completes but before Phase 2 establishment.

CPhase 1 negotiations will skip pre-shared key exchange.

XAuth enhances the authentication process but does not replace or cause Phase 1 negotiations to skip the essential pre-shared key or certificate exchange.

DDialup clients must provide their local ID during phase 2 negotiations.

Local ID is used for peer identification during Phase 1 negotiations, and its provision by dialup clients is not specifically a function of XAuth during Phase 2.

Concept tested: IPsec VPN XAuth functionality

Source: https://docs.fortinet.com/document/fortigate/7.4.0/fortios-handbook/381504/configuring-xauth-and-ipsec-for-forticlient-vpn-users

Topics

#IPsec VPN#XAuth#Dialup VPN#Authentication

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