Pass the HP Aruba Certified Professional - Campus Access HPE7-A07 Questions and answers with Dumpstech

In Aruba AOS-CX, OSPF neighbors that reach EXSTART/EXCHANGE but fail to advance typically indicate a database description (DD) negotiation issue, most commonly caused by an MTU mismatch on the link. The OSPF header carries the interface MTU; if the values do not match, the peer rejects DD packets and the adjacency remains stuck at EXSTART (often shown as EXSTART/DR or EXSTART/BDR).

Aruba’s OSPF guidance states:

“If neighbors remain in EXSTART/EXCHANGE, verify that the Layer-3 MTU matches on both ends of the adjacency. An MTU mismatch causes DD packets to be rejected and prevents the adjacency from reaching FULL.”

Recommended corrective action is to align or remove custom L3 MTU settings on the participating interfaces (or use the mtu-ignore feature where appropriate).

In this scenario, removing the custom Layer-3 MTU configuration so both sides use the same default MTU allows DD packet negotiation to succeed and the adjacency to progress to FULL.

The issue likely stems from the Windows device not being configured to use TEAP (Tunneled Extensible Authentication Protocol) as specified in the ClearPass configuration. TEAP is an EAP method that encapsulates an inner EAP method for secure authentication. The Windows device must have TEAP enabled and correctly configured in its network settings to authenticate successfully on the network using ClearPass.

In the context of ArubaOS-CX, particularly with the 6300 series switches, setting the MTU on a routed Link Aggregation Group (LAG) interface requires the interface lag id command in the configuration, specifying the LAG interface you're configuring. The ip mtu command is then used to set the desired MTU size for that LAG. Option A correctly shows this configuration process, where the MTU is set to 9198 for the LAG interface, in line with the requirements for routing larger frames, which could be necessary for certain applications or data flows that require jumbo frames.

The information related to the configuration of Aruba switches is consistent with the principles and guidelines found in the technical documentation for the ArubaOS-CX 6300 series switches, which emphasizes the importance of correct MTU settings for network performance and stability.

If some users are unable to connect to an SSID configured with WPA3-Enterprise GCM-256, and the "MAC Authentication Fall-Through" is disabled, it means that devices which fail 802.1X authentication will not attempt MAC authentication. If these client devices are configured to use MAC authentication as a backup method, they will fail to connect, explaining the issue faced by some users.

In a VXLAN environment, unknown unicast traffic, such as ARP requests from H1, which does not have a specific destination MAC address learned by the switch A2, will be flooded out of all interfaces. This flooding behavior is necessary because A2 needs to ensure that the ARP request reaches its intended destination, which might be on any of the interfaces. It's a part of the standard behavior of switches to handle ARP traffic when the destination hardware address is unknown.

The CLI output shown is from the Aruba CX 6300 running AOS-CX, displaying the routing table in an EVPN-VXLAN fabric environment.

Key details from the output:

Prefix Nexthop Interface Origin/Type Distance/Metric

10.203.1.0/24 - vlan203 C [0/0]

10.203.1.1/32 - vlan203 L [0/0]

10.203.1.100/32 172.21.11.2 - B/EV [200/0]

172.21.11.4/32 172.21.11.2 - B/EV [200/0]

172.21.11.5/32 - loopback3 L [0/0]

From this, we can interpret the following:

Routes marked as B/EV originate from BGP EVPN, meaning they are advertised and learned over the VXLAN fabric.

The next hop 172.21.11.2 indicates that these routes are learned from another fabric device with loopback address 172.21.11.2.

The route 10.203.1.100/32 is a host route (specific endpoint) reachable via that remote switch.

According to the Aruba CX EVPN-VXLAN Fabric Deployment Guide:

“In a VXLAN fabric, host routes (/32) are dynamically advertised using EVPN Type 2 routes.

These routes include MAC/IP bindings of endpoints connected to remote VTEPs (loopbacks).

The next-hop address in the routing table corresponds to the VTEP IP (loopback address) of the remote switch where the client resides.”

Thus, the presence of a /32 route (10.203.1.100/32) with next hop 172.21.11.2 indicates that this wired client resides behind another CX 6300 fabric node whose VTEP address is 172.21.11.2.

Option Analysis:

A. Correct – The /32 route confirms that 10.203.1.100 is reachable via remote CX at 172.21.11.2 (remote VTEP).

B. Incorrect – The RD information isn’t shown here; this statement cannot be validated and contradicts visible EVPN entries.

C. Incorrect – The route is properly advertised and reachable via EVPN; no indication of advertisement failure.

D. Incorrect – Overlay loopbacks (172.21.11.x) are advertised as /32 host routes, not /24 subnets.

Final Verified Answer: A

Reference Sources (HPE Aruba Official Materials):

Aruba AOS-CX EVPN-VXLAN Fabric Deployment and Configuration Guide

Aruba CX 6300 Routing and BGP Configuration Guide

Aruba Certified Switching Professional (ACSP) Study Guide – EVPN-VXLAN Route Interpretation

Graceful Restart (GR) allows a router to continue forwarding packets while it restarts its OSPF process. The GR helper role on AOS-CX switches supports routers during this process. OSPF routers listen for Grace-LSAs to identify neighbors undergoing a graceful restart, maintaining adjacencies with those routers to allow uninterrupted forwarding.

In a high availability setup where both primary and secondary gateway clusters are present, APs are typically designed to connect to the primary cluster. If the APs are equally split between the primary and secondary, this may indicate that some APs cannot reach the primary cluster due to connectivity issues or reachability constraints, thus falling back to the secondary cluster.

When onboarding devices into a centralized management system, each device can have its individual admin password set during the onboarding process. If this password doesn't match what is expected at the group level in the central management platform, login issues such as the one described can occur.

MU-MIMO (Multi-User, Multiple Input, Multiple Output) provides the most efficient use of airtime for VoIP traffic among the options listed. MU-MIMO allows multiple users to receive multiple data streams simultaneously, improving the overall efficiency of the network, especially in dense environments where VoIP applications need consistent and reliable connectivity.