HPE4-A51 Sample Questions & Answers
Deploying wireless access points and SSIDs carries the biggest share, ahead of monitoring and automating the network, onboarding devices with zero-touch provisioning, securing wired and wireless networks, advanced WLAN settings, and troubleshooting.
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- Question 1Intermediate
Device Management and Onboarding · Zero Touch Provisioning (ZTP) and One Touch Provisioning (OTP)
You are deploying a pair of Aruba 9004 Gateways at a branch site. The site has no local IT staff. You plan to use One Touch Provisioning (OTP). Which of the following statements correctly describes the OTP requirement for these gateways?
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Correct answer: A
OTP for gateways allows them to communicate with Central even if ZTP (DHCP/DNS) fails or is unavailable. It involves connecting a computer to the gateway's OOB console or specific port and pushing a basic configuration (uplink setup) to allow it to reach the cloud. This is often necessary when static IPs or PPPoE are required for the WAN link.
- Question 2Advanced
Device Management and Onboarding · Manual provisioning
A network administrator is creating a configuration template for AOS-CX switches in Central. They need to ensure that the hostname of each switch is dynamically set based on the device's properties defined in the variable file. Which syntax correctly represents the variable for hostname assignment?
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Correct answer: C
In HPE Aruba Networking Central templates for AOS-CX, variables are enclosed in percentage signs. For example,
hostname %hostname%allows the system to replace%hostname%with the value specified in the uploaded variables CSV or JSON file for that specific device serial number. - Question 3Intermediate
Device Management and Onboarding · HPE Aruba Networking Central UI Groups
When moving a pre-configured AP from a 'Test' UI group to a 'Production' UI group in HPE Aruba Networking Central, what happens to the AP's configuration?
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Correct answer: D
In Central, the Group is the source of truth for configuration. When a device is moved to a new group, it will synchronize with the new group's configuration. This typically involves a reboot for APs to apply the new settings (SSIDs, RF profiles, etc.), effectively overwriting the previous group's settings.
- Question 4Intermediate
Device Management and Onboarding · Sync devices' configuration with HPE Aruba Networking Central
You are auditing a customer's device inventory in HPE Aruba Networking Central. You notice several switches have a 'Sync Status' of 'Not Synced'. Upon investigation, you find that local changes were made via CLI. Which action in Central enforces the group configuration and overwrites the local changes?
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Correct answer: C
When a device is 'Not Synced' due to local changes (Auto-rollback failure or ignored), the administrator typically needs to initiate a configuration push from Central to enforce the desired state. This might involve clearing the error or re-saving the group configuration to trigger a sync event. (Note: The most precise action depends on the UI version, but generally involves re-asserting the Central config).
- Question 5IntermediateSelect 2
Device Management and Onboarding · Zero Touch Provisioning (ZTP) and One Touch Provisioning (OTP)
A new branch office requires 20 APs to be provisioned. The local firewall blocks all outbound traffic by default. To enable Zero Touch Provisioning (ZTP) for these APs to reach HPE Aruba Networking Central, which specific outbound ports must be opened on the firewall? (Select TWO)
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Correct answers: A, C
Correct time synchronization is critical for certificate validation during the secure connection establishment. Therefore, NTP (UDP 123) must be allowed.
TCP 443 is required for the HTTPS WebSocket connection to Central for management and control plane traffic.
- Question 6Advanced
Deploy Wired Campus Access Networks · Configure VSX, MC-LAGs, VLANs, and SVIs
You are configuring a VSX pair of AOS-CX switches for a campus aggregation layer. You have configured the Inter-Switch Link (ISL) and the Keepalive link. During a failure test, you disconnect the ISL. You observe that the secondary switch shuts down its SVI interfaces and downstream VSX LAG members. What is the technical reason for this behavior?
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Correct answer: B
This is the correct split-brain protection mechanism in VSX. If the ISL fails but the Keepalive link is still active, the switches can communicate to determine that both are still up. To prevent split-brain (where both switches act as the active gateway), the secondary switch shuts down its VSX LAGs and SVIs (virtual gateways), allowing the primary to handle all traffic.
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