HP HPE7-A07 Exam With Confidence Using Practice Dumps

The provided output is from the command:

(MC2) #show auth-tracebuf mac

This command traces the authentication exchange between the access point (or mobility controller) and the RADIUS server for a specific client. The trace provides insight into the 802.1X authentication sequence and RADIUS responses.

From the exhibit:

EAPOL (Extensible Authentication Protocol over LAN) Messages Observed:

eap-id-req

eap-id-resp

eap-req

eap-resp

eap-success

These messages clearly indicate that an 802.1X (EAP-based) authentication took place. MAC authentication (MAB) or WebAuth would not include multiple EAP identity and response messages.

RADIUS Messages:

rad-req, rad-resp, rad-accept from /RADIUS1

The presence of rad-accept indicates successful authentication.

Exact extract from ArubaOS (AOS-S/AOS 10 WLAN Authentication Guide):

“When the trace output shows EAP identity requests, EAP responses, and a RADIUS Access-Accept message, the authentication method in use is 802.1X (EAP-based user authentication). The presence of EAP-Success following the Access-Accept confirms successful 802.1X authentication.”

Follow-on WPA2 Key Exchange:

Lines show wpa2-key1, wpa2-key2, wpa2-key3, and wpa2-key4.

This sequence occurs after 802.1X authentication completes and is used to establish encryption keys for a WPA2 Enterprise session.

Exact extract from Aruba WLAN Troubleshooting Guide:

“After successful 802.1X authentication (EAP-Success), the controller exchanges four WPA2 keys with the station to derive the session keys used for data encryption. This confirms WPA2-Enterprise with 802.1X was used.”

No Indication of MAC or WebAuth:

MAC authentication would show mac-auth or macauth messages instead of eap-id-req/resp.

WebAuth involves HTTP-based redirection and is not visible in auth-tracebuf as EAP transactions.

Exact extract:

“MAC authentication shows ‘macauth start’ and ‘macauth accept’ entries, not EAPOL frames. WebAuth authentication uses a web redirect and does not appear as EAP frames in the trace buffer.”

Therefore, the trace confirms a WPA2-Enterprise 802.1X user authentication, where the user’s credentials were validated by the RADIUS server, followed by the WPA2 key handshake.

Why the Other Options Are Incorrect:

A. MAC authentication:Would show MAC-based request/response entries (macauth), not eap-id-req/resp.

C. WEBauth authentication:WebAuth occurs over HTTP/HTTPS and does not involve EAP messages; thus, no eap-id or eap-success would be seen.

D. 802.1X machine authentication:Machine authentication occurs before user logon and is typically identified in logs by a computer account (e.g., host/computername$). Here, the username and context indicate a user-level session.

References of HPE Aruba Networking Switching Documents or Study Guide:

ArubaOS 8/10 WLAN Authentication and Security Configuration Guide – “802.1X EAP Authentication and Trace Analysis.”

Aruba WLAN Troubleshooting Guide – “Using show auth-tracebuf to validate EAP authentication.”

Aruba Campus Wireless Design Fundamentals – “Understanding WPA2-Enterprise authentication flow (EAPOL, RADIUS, WPA2 4-Way Handshake).”

Aruba Access Security and AAA Implementation Guide – “Distinguishing between MAC, WebAuth, and 802.1X authentication in debug outputs.”

In Aruba CX 6300 and other AOS-CX switches, device profiling enables automatic assignment of roles and policies to endpoints based on device attributes such as MAC OUI, LLDP, or DHCP fingerprint — without requiring an external authentication server such as ClearPass or RADIUS.

The configuration snippet shows:

mac-group iot

seq 10 match mac-oui 81:cd:93

port-access device-profile iot-prod

enable

associate role iot-prod

associate mac-group iot

This means that any device with a MAC address matching the OUI 81:cd:93 will automatically be assigned the iot-prod device profile and its associated role (iot-prod).

However, the requirement also specifies that any other device connected to the same interface (that does not match the OUI or device profile) should still be assigned a default role called iot-default.

To ensure that endpoints not matching any known device profile still receive limited network access, Aruba AOS-CX uses the fallback-role feature under port-access configuration.

The command:

port-access fallback-role iot-default

defines the role that will be automatically assigned to endpoints that fail to match any of the configured device-profile conditions.

This mechanism is crucial in lab or standalone environments where no external authentication (e.g., RADIUS, ClearPass) is configured. It ensures devices are still given a default policy, preventing them from being left in an unauthenticated or blocked state.

Official HPE Aruba Extract (ArubaOS-CX Security and Access Guide):

“The fallback-role command allows the switch to assign a predefined local role to a device when no authentication server is available, or when the device does not match any configured device profile.”

“This command is typically used in test or lab environments where profiling is local to the switch, and a baseline role must still be enforced for unknown devices.”

Therefore, in this case:

Devices matching the MAC OUI 81:cd:93 → assigned iot-prod role

All other devices → automatically assigned iot-default role via port-access fallback-role iot-default

Option Analysis:

A. Incorrect – The port-access onboarding-method precedence command changes the priority order between authentication methods (e.g., 802.1X, MAC-auth, device profile). It does not control fallback behavior.

B. Incorrect – The block-until-profile-applied option delays port activation until profiling completes, but it doesn’t provide a fallback role.

C. Correct – The port-access fallback-role iot-default command ensures that any device not matching the iot-prod profile receives the iot-default role.

D. Incorrect – Lowering precedence has no effect on assigning a default role.

Final Verified Answer: C

Reference Sources (HPE Aruba Official Materials):

Aruba AOS-CX Security and Access Configuration Guide – Device Profiling and Role Assignment

Aruba Certified Switching Professional (ACSP) Study Guide – Port Access and Device Profiling

ArubaOS-CX Fundamentals Guide – Port Access and Fallback Role Implementation

In the provided configuration for interface 1/1/7, there are roles specified for different scenarios concerning authentication. When a voice client attempts to connect and the RADIUS server is unreachable, the role that is assigned is the one specified as the "critical-voice-role". In this case, the "CRITICAL_VOICE" role is configured to be assigned under such circumstances, ensuring that voice clients receive appropriate network access permissions even when the RADIUS server is not available to authenticate them.