HPE4-A51 HPE Campus Access Mobility Expert Practical Exam Practice Questions
Prepare for HPE4-A51 with more than an answer.
- Level
- Expert
- Valid for
- 3 years
Domains covered on the exam 7
- Device Management and Onboarding16%
- Deploy Wired Campus Access Networks8%
- Advanced WLAN Configuration13%
- Deploy Wireless Campus Access Networks24%
- Monitoring and Network Automation18%
- Troubleshooting10%
- Secure Wired and Wireless Networks11%
- 1
You are validating an MC-LAG configuration on a pair of AOS-CX switches connecting to a server. The server administrator reports intermittent connectivity. You check the LACP status on the switch and see the following:
Aggregator: lag1 Partner System ID: 00:00:00:00:00:00 Partner Oper Key: 0What does this output indicate?
Show answer details
Correct answer: B
A Partner System ID of all zeros typically indicates that the switch is not receiving LACP PDUs from the connected device. This suggests the server interface is either configured for static LAG (on, not active/passive) or not configured for LAG at all.
- 2
A university has a requirement to support 'Colorless Ports' for their campus APs. Any AP plugged into any access port should automatically be assigned to the Management VLAN and have the correct PoE priority. Which AOS-CX feature best satisfies this requirement?
Show answer details
Correct answer: C
AOS-CX Device Profiles allow the switch to detect the type of device (e.g., an Aruba AP) via LLDP or CDP and automatically apply a pre-defined configuration (VLANs, PoE priority, etc.) to that port. This enables 'colorless ports' where the port config adapts to the connected device.
- 3
You are configuring the OSPF underlay for a campus network that will support APs tunneling traffic to a Gateway Cluster. What is the recommended OSPF configuration for the Loopback interfaces on the switches to ensure stable reachability for the AP tunnels?
Show answer details
Correct answer: A
Loopback interfaces are stable IP anchors. They should be advertised into OSPF so other devices can reach them (e.g., for management or tunnel endpoints), but they do not connect to other OSPF routers, so they should be passive to prevent unnecessary Hello packets.
- 4
A large university is deploying 500 HPE Aruba Networking APs across a new campus extension. The deployment utilizes HPE Aruba Networking Central for management. The network architect has configured a DHCP server to support Zero Touch Provisioning (ZTP). However, during the initial rollout, the APs obtain IP addresses but fail to appear in the Central 'Device Inventory'. The firewall team confirms that HTTPS traffic is allowed. Which specific DHCP option must be verified to ensure the APs can resolve the Central URL correctly?
Show answer details
Correct answer: D
For ZTP to function, the device must be able to resolve the URL 'device.arubanetworks.com' (or the specific regional URL). If the device gets an IP but cannot resolve the Central URL, it cannot check in. DHCP Option 6 provides the DNS server IP addresses necessary for this name resolution. While Option 43 and 60 are used for Controller discovery or specific vendor identification, DNS (Option 6) is fundamental for cloud discovery.
- 5
You are designing a configuration hierarchy in HPE Aruba Networking Central for a multinational corporation with sites in New York, London, and Tokyo. The requirement is to have a global SSID configuration for 'Eduroam' but distinct RF profiles for each region due to regulatory domain differences. Which approach best utilizes Central's Group and Site architecture to minimize administrative overhead?
Show answer details
Correct answer: A
In HPE Aruba Networking Central, configuration is primarily defined at the Group level. While it is possible to override some settings at the device level, creating separate groups for distinct regulatory domains or major RF differences is the standard best practice. This allows for specific RF profiles per region while maintaining the ability to replicate the SSID config (or use APIs to sync them). Central does not support a 'Global Group' inheritance model where a child group inherits an SSID but overrides the RF profile in the way suggested by other options.
- 6
An engineer needs to replace a failed AOS-CX switch that is managed by HPE Aruba Networking Central. The new switch is the exact same model. Which workflow ensures the new switch receives the exact configuration of the failed unit with minimal manual intervention?
Show answer details
Correct answer: C
HPE Aruba Networking Central provides a specific 'Replace Device' workflow. By selecting the faulty device and choosing 'Replace', you can map the old configuration, license, and group assignment to the new device's serial number/MAC. This ensures that not just the Group configuration, but also device-specific overrides and historical data associations (where applicable) are transferred or preserved.
