HPE4-A54 sample questions

Question 1

True or False: When discovering requirements for a greenfield deployment, analyzing the existing network topology is completely unnecessary since all new HPE Aruba Networking hardware will be installed.

Accepted Answer

False

Answer

True

Question 2

A large hospital is refreshing its campus network. During discovery, you map out their current architecture (see diagram). They require seamless roaming for VoIP devices across all wards. The current design uses traditional L2 VLANs stretched across multiple access switches, leading to large broadcast domains. Which constraint MUST you document when proposing a migration to a routed access layer with EVPN-VXLAN? ```mermaid flowchart TD Core[Legacy Core] -->|L2 Trunk| Agg1[Agg Switch 1] Core -->|L2 Trunk| Agg2[Agg Switch 2] Agg1 -->|VLAN 10,20| Acc1[Ward A Access] Agg2 -->|VLAN 10,20| Acc2[Ward B Access] Acc1 -.->|VoIP Roaming| Acc2 ```

Accepted Answer

The migration strategy must account for gateway IP coexistence or a flash-cutover, as moving the default gateway from the legacy core to the EVPN distributed anycast gateway will impact L2 roaming during transition.

Answer

The VoIP devices must support native BGP peering to participate in the EVPN control plane.

Answer

The legacy access switches must be upgraded to support VXLAN VTEPs before the core can be replaced.

Answer

Multicast routing is unsupported in EVPN-VXLAN, so the hospital must replace their VoIP system with a unicast-only solution.

Question 3

When performing network discovery, an architect needs to quickly map the physical topology of third-party IP phones and APs connected to an existing Aruba CX switch. The architect should use the _____ protocol command outputs to identify these directly connected neighbors.

Accepted Answer

LLDP

Answer

OSPF

Answer

BGP

Answer

MSTP

Question 4

You are discovering requirements for a manufacturing facility. The customer mentions they use older 2.4 GHz handheld scanners that cannot be upgraded due to budget constraints, but they also want to deploy new 6 GHz capable laptops for the engineering team. What is the most critical constraint to document regarding AP selection?

Accepted Answer

The new APs must support Wi-Fi 6E (6 GHz) but must also retain 2.4 GHz radios, potentially requiring tri-band APs (like the AP-635 or AP-655).

Answer

The customer must replace the handheld scanners, as Wi-Fi 6E access points do not have 2.4 GHz radios backward compatibility.

Answer

The 6 GHz spectrum must be disabled during business hours to prevent interference with the 2.4 GHz manufacturing scanners.

Answer

A separate physical network of AP-505s must be deployed purely for the scanners, alongside AP-635s for the laptops.

Question 5

During discovery, you find the customer is currently running a single-area OSPF design with 300 routers. They are experiencing high CPU utilization on their core switches during link flaps. They want to migrate to an EVPN-VXLAN architecture using eBGP as the underlay. Which of the following is the BEST technical requirement to define to resolve their current issue? ```mermaid flowchart LR A[Link Flap] --> B[OSPF LSA Flood] B --> C[SPF Recalculation] C --> D[High CPU on Core] ```

Accepted Answer

The underlay must use eBGP, which inherently isolates fault domains and prevents network-wide SPF recalculations during localized link flaps.

Answer

The new core switches must have larger CPUs to handle the OSPF LSA floods, as BGP cannot be used as an underlay for EVPN.

Answer

The OSPF timers must be tuned to aggressive sub-second intervals to allow the SPF algorithm to run faster, reducing overall CPU load.

Answer

The network must implement OSPF totally stubby areas at the core to block external LSAs from reaching the edge.

Question 6

A customer requests 'five nines' (99.999%) of uptime for their campus core network. During discovery, you note they only have a budget for a single fiber run between buildings and a single power circuit in their main MDF. How should you handle this requirement?

Accepted Answer

Document the physical infrastructure limitations as a constraint that prevents achieving 99.999% uptime, and propose a highly available logical design within the physical budget limits.

Answer

Design a standard single-switch core to meet the budget, and assure the customer that Aruba CX hardware naturally achieves five nines without redundancy.

Answer

Ignore the budget constraint and include redundant fiber trenching and power upgrades in the BoM to ensure the five nines requirement is met.

Answer

Propose Aruba Central AIOps to predict fiber cuts before they happen, satisfying the uptime requirement.

HPE4-A54 Sample Questions & Answers

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HPE4-A54 Sample Questions & Answers

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