NSE7_LED-7.0 Fortinet NSE 7 - LAN Edge 7.0 Questions and Answers

According to the exhibit, the network topology and SSID settings show that FortiGate is configured to use an external captive portal hosted on FortiAuthenticator, which is connected to a Windows AD server for user authentication. However, wireless users are not able to see the captive portal login page, which means that they are not redirected to the external captive portal URL. Therefore, option B is true because adding the FortiAuthenticator and WindowsAD address objects as exempt destinations services will allow the wireless users to access the external captive portal URL without being blocked by the firewall policy. Option A is false because enabling NAT in the firewall policy with the ID 13 will not affect the redirection to the external captive portal URL, but rather the source IP address of the wireless traffic. Option C is false because enabling the captive-portal-exempt option in the firewall policy with the ID 12 will bypass the captive portal authentication for the wireless users, which is not the desired outcome. Option D is false because removing the guest.portal user group in the firewall policy with the ID 12 will prevent the wireless users from being authenticated by FortiGate, which is required for accessing the external captive portal.

Fortinet’s official documentation, including the FortiOS Handbook and NSE 7 training materials, provides detailed guidance on troubleshooting RADIUS authentication issues. The three tools listed below are explicitly supported for diagnosing RADIUS-related problems in FortiOS:

B. You can use the diagnose test authserver radius command to verify RADIUS server configuration, user credentials, and user group membership.This command is a well-documented troubleshooting tool in the FortiOS CLI Reference and Technical Documentation. It allows administrators to manually test RADIUS authentication by specifying the RADIUS server, username, and password. The output provides details on whether the authentication succeeds or fails, along with information about group membership and server reachability. For example:

bash

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diagnose test authserver radius

This is a critical tool for verifying the RADIUS server's configuration and user authentication flow.

D. You can enable debug for the fnbamd process to view RADIUS authentication details.The fnbamd process (FortiNet Authentication Daemon) handles non-local authentication protocols like RADIUS and LDAP in FortiOS. Enabling debug for this process provides real-time logs of the authentication exchange between the FortiGate and the RADIUS server. This is officially recommended in Fortinet’s troubleshooting guides for advanced diagnostics. The command sequence is:

bash

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diagnose debug application fnbamd -1

diagnose debug enable

After testing, you can disable debugging with diagnose debug disable. This tool is invaluable for identifying issues such as misconfigured shared secrets, timeouts, or attribute mismatches.

E. You can use the diagnose test application radiusd command to verify the RADIUS server configuration, user credentials, and user group membership.The radiusd process relates to the RADIUS daemon on the FortiGate, and this diagnostic command tests the RADIUS server’s operational status and authentication functionality. While less commonly highlighted than diagnose test authserver radius, it is referenced in Fortinet’s CLI documentation for deeper troubleshooting of the RADIUS service itself. It provides detailed output about the server’s response and can help isolate issues specific to the RADIUS protocol implementation.

Why not A and C?

A. You can enable debug for the fssod process to view RADIUS authentication details.The fssod process relates to FortiSSO (Single Sign-On) and is primarily used for FSSO-based authentication, not direct RADIUS troubleshooting. While it may log some authentication-related events in specific SSO scenarios, it is not a standard tool for RADIUS diagnostics according to Fortinet’s official documentation. Thus, it is not a correct choice here.

C. You can check the Firewall Users widget to view the list of active RADIUS users.While the Firewall Users widget (available in the FortiOS GUI underUser & Authentication > Firewall Users) shows a list of authenticated users, it is a monitoring tool, not a troubleshooting tool. It does not provide diagnostic details about RADIUS authentication failures or server issues, making it insufficient for this purpose per Fortinet’s troubleshooting methodology.

Source Verification

The answers are derived from official Fortinet resources, including:

FortiOS 7.0 CLI Reference(diagnose commands section)

FortiOS Handbook: Authentication(RADIUS troubleshooting section)

NSE 7 - LAN Edge 7.0 training materials (authentication diagnostics module)

These tools (B, D, E) align with Fortinet’s recommended practices for diagnosing RADIUS authentication issues effectively.

https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-enable-and-disable-broadcast-of-SSID/ta-p/191840

According to the FortiGate Administration Guide, “To use an external captive portal, you must configure a user group that uses the external captive portal as the authentication method and apply it to a firewall policy.” Therefore, option C is true because it will allow the wireless users to be redirected to the external captive portal URL when they try to access the Internet. Option A is false because disabling the user group from the SSID configuration will prevent the wireless users from being authenticated by the FortiGate device. Option B is false because enabling the captive-portal-exempt option in the firewall policy will bypass the captive portal authentication for the wireless users, which is not the desired outcome. Option D is false because including the wireless client subnet range in the Exempt Source section will also bypass the captive portal authentication for the wireless users, which is not the desired outcome.

According to the FortiGate Administration Guide, “EAP-TLS is the most secure EAP method. It requires a digital certificate on both the server end and the client end. The server and client authenticate each other using their certificates.” Therefore, option D is true because it describes the EAP method that requires the use of a digital certificate on both the server end and the client end. Option A is false because EAP-TTLS only requires a digital certificate on the server end, not the client end. Option B is false because PEAP also only requires a digital certificate on the server end, not the client end. Option C is false because EAP-GTC does not require a digital certificate on either the server end or the client end.

According to the exhibit, the User-Name attribute in the RADIUS Access-Request packet contains the client MAC address of 00:0c:29:6a:2b:3d. This indicates that FortiSwitch is authenticating the client using MAC authentication bypass (MAB), which is a method of authenticating devices that do not support 802.1X by using their MAC address as the username and password. Therefore, option B is true because it explains why the User-Name attribute contains the client MAC address. Option A is false because AD machine authentication uses a computer account name and password, not a MAC address. Option C is false because userauthentication uses a user name and password, not a MAC address. Option D is false because FortiSwitch is sending a RADIUS Access-Request message to FortiAuthenticator, not a RADIUS accounting message.

According to the exhibit, the RADIUS server configuration on FortiGate points to FortiAuthenticator, which is acting as an authentication proxy and is configured to relay all authentication requests to a remote Windows AD server using LDAP. However, LDAP does not support MSCHAP2 authentication, which is required for RADIUS. Therefore, option A is true because on FortiAuthenticator, enabling Windows Active Directory Domain Authentication will add FortiAuthenticator to the Windows domain and allow it to use MSCHAP2 authentication with the AD server. Option C is also true because on FortiAuthenticator, changing the back-end authentication server from LDAP to RADIUS will allow it to use MSCHAP2 authentication with the AD server. Option B is false because on FortiGate, configuring the NAS IP setting on the RADIUS server will not affect the MSCHAP2 authentication, but rather the source IP address of the RADIUS packets. Option D is false because on FortiGate, updating the Secret setting on theRADIUS server will not affect the MSCHAP2 authentication, but rather the shared secret between FortiGate and FortiAuthenticator.

According to the FortiAuthenticator Administration Guide2, “The guest portal provides pre and post-log in services for users (such as password reset and token registration abilities), and rules and replacement messages can be configured.” Therefore, option C is true. The same guide also states that “Administrators can use one or more incoming parameters to configure a mapping rule for the guest portal.” Therefore, option D is true. Option A is false because remote users can sponsor any number of guest accounts, as long as they do not exceed the maximum number of guest accounts allowed by the license. Option B is false because administrators can choose to approve or reject guest accounts, or enable auto-approval.