HP HPE7-A08 Practice Test Questions Answers

On AOS-CX, Dynamic ARP Inspection distinguishes between trusted and untrusted interfaces . All interfaces are untrusted by default, and ARP packets arriving on untrusted ports are checked against valid IP-to-MAC bindings, principally the DHCP snooping binding database or supported static bindings. HPE Aruba specifies that only ARP traffic entering untrusted interfaces is subjected to these validation checks. Aruba Networks

A hypervisor port is a special case because the physical interface can legitimately source ARP traffic for many virtual machines , each with its own MAC address and IP address. Unless every VM has a corresponding valid binding available to Dynamic ARP Inspection, legitimate VM ARP traffic can be interpreted as invalid. Configuring interface 1/1/20 as trusted prevents these legitimate ARP messages from generating false-positive inspection failures.

On the CX 6300, the correct interface-level configuration is:

interface 1/1/20

arp inspection trust

HPE Aruba explicitly documents arp inspection trust under the physical interface configuration context and confirms that it marks the interface as trusted. Aruba Networks

Options B, C, and D are not valid forms of the AOS-CX DAI trust command. Trust is assigned to the interface , not directly to an individual MAC/IP pair using those syntaxes.

Study Guide References: Dynamic ARP Inspection; DHCP Snooping Bindings; Trusted and Untrusted Interfaces; Hypervisor Connectivity; ARP Spoofing Protection.

Valid Network Analytics Engine (NAE) agent actions include:

Running CLI commands (Option A), allowing automated command execution for remediation or data collection.

Generating local system logs (Option C) for event tracking and audit purposes.

Other options:

Generating SNMP traps (B) and starting/stopping packet captures (D) are not typical NAE actions.

Creating a new TAC case (E) is an external process, not an automated NAE action.

This scenario highlights a common conflict between Port Access Control and WLAN architectures in AOS10.

Tunnel Mode vs. Bridge Mode: * In Tunnel Mode, client traffic is encapsulated (GRE/IPsec) from the AP to the Gateway. The switch port only sees the MAC address of the AP itself. Once the AP authenticates via 802.1X, all tunneled client traffic passes through the authenticated " tunnel " unnoticed by the switch ' s port security.

In Bridge Mode, the AP bridges wireless client traffic directly onto the local VLAN. The switch port now sees the MAC addresses of the wireless clients.

The Conflict: By default, an 802.1X port expects only one authenticated device. When the AP authenticates, the port is " open " for the AP ' s MAC. However, when a wireless client’s bridged MAC appears on the same port, the switch treats it as an unauthenticated intruder and drops its DHCP requests.

The Solution (Device Mode): You must configure the User Role assigned to the AP (after it authenticates) with device-mode (often referred to as dev-conf-mode or device auth-mode in exam contexts). This tells the switch: " The device that just authenticated is a trusted infrastructure device (an AP). Please allow all subsequent MAC addresses seen on this port to pass without requiring individual authentication. "

Capacity management in a high-density wireless environment (especially with Wi-Fi 6E APs like the AP-615) focuses on two finite resources: Bandwidth and Power.

Switch PoE Utilization (Option D): AP-615s are high-performance devices that typically require PoE+ (802.3at) power. As more APs are added to a switch, the total power draw approaches the switch ' s PoE Budget. Enabling this alert ensures that Central notifies the administrator when the total power consumed by the APs reaches a critical threshold, preventing a scenario where new APs fail to power up or existing APs reboot due to power starvation.

Switch Uplink Port Usage (Option A): This alert monitors the aggregate traffic flowing through the switch ' s uplinks to the core or distribution layer. Since multiple APs share these uplinks, high wireless client activity can saturate the backhaul. Monitoring the " Uplink Port Usage " (measured in GB over a duration) allows the customer to identify when they need to upgrade to higher-speed transceivers (e.g., from 10G to 25G) or add more links to the LAG.

Why other options are incorrect:

Options C and E: Port Tx/Rx rates are useful for monitoring individual ports, but " Capacity Issues " for a group of APs is better represented by the aggregate Uplink usage.

Option B: Link Status Change notifies you of a down/up event, which is a connectivity/fault issue rather than a capacity/utilization issue.

Dynamic ARP Protection (DAP) is a security feature used to intercept and validate ARP packets in a network to prevent " man-in-the-middle " attacks like ARP spoofing.

Validation Source: For the switch to know if an ARP packet is legitimate, it must check the sender ' s IP and MAC address against a trusted database.

Dynamic vs. Static: * In most modern environments, the switch builds this database automatically by using DHCP Snooping. When a client gets an IP from a DHCP server, the switch records the binding.

Static Environments (The Solution): If you have servers or devices with static IP addresses (no DHCP server), DHCP snooping will have no record of them. To prevent these legitimate devices from being blocked by ARP protection, you must manually configure Static IP-to-MAC bindings.

Why Option D is Correct: It correctly identifies that the feature is flexible enough to support non-DHCP environments through manual configuration.

Why others are incorrect: * Option A: While highly recommended, a DHCP server is not strictly required because of the static binding fallback.

Option C: Simply enabling the features isn ' t enough; you must also consider untrusted vs. trusted ports. Furthermore, " full information " is a bit of an overstatement, as static devices still need manual intervention.