HPE7-A07 Exam Dumps - Aruba Certified Campus Access Mobility Expert Written Exam

Dynamic Multicast Optimization (DMO) and Multicast Transmission Optimization are features that can help address issues with multicast traffic in wireless environments. DMO optimizes the way multicast traffic is transmitted over the air by converting multicast streams into unicast streams to the clients that need them. This reduces unnecessary traffic for clients that have not subscribed to the multicast group and can improve overall network performance. Multicast Transmission Optimization adjusts the transmission rate of multicast frames to ensure they are sent at optimal speeds, addressing the issue of multicast flow being received at slow speeds by all users.

Comprehensive and Detailed Explanation (Verified Extract from HPE Aruba Networking AOS-10 Gateway Documentation)

The Change of Authorization (CoA) message is a RADIUS-based control packet typically sent by ClearPass Policy Manager or another RADIUS server to modify client authorization dynamically after authentication.

In ArubaOS 10, CoA and Disconnect-Request (DM) messages use UDP port 3799 and are received on the control path of the gateway, not the datapath.

HPE Aruba AOS-10 documentation specifies:

“Use the command packet-capture controlpath udp 3799 on the gateway to verify that CoA packets are being received and processed on the control plane.”

“The controlpath capture displays inbound CoA or DM messages received from RADIUS servers such as ClearPass.”

Command breakdown:

packet-capture controlpath udp 3799

controlpath → Captures control-plane traffic (used for management protocols like RADIUS, CoA, CAPWAP, etc.)

udp 3799 → Filters only CoA/DM packets

Why Others Are Incorrect:

A. interprocess captures internal gateway processes, not RADIUS packets.

C. diag utilities tcpdump is used in AOS 8.x, not AOS 10.

D. tcpdump host-port 3576 uses the wrong port; CoA uses UDP 3799, not 3576 (which is for standard RADIUS authentication).

✅ Final Verified Answer: B. packet-capture controlpath udp 3799

📘 Reference Sources (HPE Aruba Official Materials):

Aruba AOS-10 Gateway Troubleshooting Guide – Control Path Packet Capture Commands

Aruba ClearPass and AOS Integration Guide – RADIUS CoA Port (UDP 3799)

Aruba Certified Mobility Professional (ACMP) Study Guide – CoA and Disconnect Message Verification

During the testing of RadSec authentication over VXLAN, if the RadSec connection fails during the digital certificate exchange, it typically indicates an issue with the establishment of the TLS tunnel, which is required for RadSec's secure communication. The failure of TLS tunnel establishment can occur due to RADIUS TCP packets being dropped, preventing the secure exchange of digital certificates necessary for RadSec authentication. The other options, such as IPv6 address reachability, tracking mode settings, and proxy server misconfiguration, are not directly related to the failure of the TLS tunnel establishment during the certificate exchange process

When configuring an 802.1X supplicant for wireless network access with Microsoft Windows 10, enabling server certificate validation is a critical step to ensure the security of the authentication process. Server certificate validation helps prevent man-in-the-middle attacks by ensuring the RADIUS server presenting the certificate is the correct server that the client expects to communicate with.

Comprehensive and Detailed Explanation From Exact Extract of HPE Aruba Networking Switching:

On Aruba switches (AOS-CX/AOS-S), multiple IPv4 networks can be configured on the same VLAN interface (SVI) by assigning a primary address and one or more secondary addresses. The VLAN remains one Layer-2 broadcast domain; adding more IP subnets does not create subinterfaces and does not split the broadcast domain.

Exact extract:

“A VLAN interface may be configured with a primary IP address and additional secondary IP addresses to host multiple subnets on the same Layer-2 broadcast domain.”

“A VLAN is a single broadcast domain. Broadcast and unknown unicast frames are flooded to all ports belonging to the VLAN.”

“Hosts in different IP subnets on the same VLAN still require Layer-3 routing to communicate; sharing the VLAN only means they share the same L2 broadcast domain.”

Therefore, when a second subnet is added to the same VLAN, broadcasts (ARP, DHCP, etc.) from devices in either subnet will be flooded to all member ports of that VLAN, making option C correct.

Options A (subinterfaces) are not used here; B is incorrect because inter-subnet traffic still needs routing; D is not categorically true—IGMP operates per VLAN with multicast routing configuration and is not inherently disabled by multiple subnets.

References of HPE Aruba Networking Switching documents or Study Guide:

Aruba AOS-CX Interface and VLAN Configuration Guide — “Primary and secondary IP addressing on VLAN interfaces; VLANs as broadcast domains.”

Aruba AOS-CX Layer 2 Fundamentals — “Flooding behavior for broadcast/unknown frames within a VLAN.”

Aruba Campus Wired Design Fundamentals — “Multiple IP subnets on one VLAN and routing implications.”

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