HPE4-A53 Sample Questions & Answers
Five equally weighted areas run from security configuration built on AAA and policy through OSPF and BGP routing, migrating to layer 3 overlay services, optimizing multicast, and structured troubleshooting of complex issues.
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- Question 1Intermediate
Configure and validate security features in CLI and HPE Aruba Networking Central · AAA and access security
You are a network architect tasked with securing the access layer of a financial institution. The company's security policy requires that all physical ports located in the public lobby must only allow a single specific device to connect at any given time. If a different device (a rogue laptop) is plugged into the port, the port must immediately shut down and generate a log event to alert the security team.
You are implementing this on an AOS-CX edge switch without the use of 802.1X or external AAA servers.
Which sequence of CLI commands correctly implements these exact requirements on interface 1/1/1?
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Correct answer: B
In the AOS-CX operating system, port security is configured under the 'port-access port-security' context of the interface. The 'client-limit 1' command restricts the port to a single MAC address, and 'violation action shutdown' ensures the port is disabled if a violation occurs.
- Question 2Beginner
Configure and validate security features in CLI and HPE Aruba Networking Central · AAA and access security
When configuring administrative access to AOS-CX core switches using TACACS+, what is the primary technical advantage of utilizing TACACS+ over RADIUS for device administration?
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Correct answer: C
A major security advantage of TACACS+ for device administration is that it encrypts the entire payload of the packet, protecting usernames, attributes, and command arguments. RADIUS natively only encrypts the user password, leaving other attributes in plain text.
- Question 3Intermediate
Configure and validate security features in CLI and HPE Aruba Networking Central · Dynamic segmentation
A network engineer is configuring dynamic segmentation and wants to utilize Downloadable User Roles (DUR) provided by ClearPass Policy Manager (CPPM). What is a critical prerequisite configuration that must be present on the AOS-CX access switch for DUR to function successfully?
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Correct answer: B
When ClearPass returns a DUR, the switch must initiate a secure HTTPS (REST API) connection back to ClearPass to download the actual role contents (ACLs, VLANs, etc.). For this HTTPS connection to establish, the switch must trust the ClearPass server's certificate (or have certificate validation explicitly disabled).
- Question 4Advanced
Configure and validate security features in CLI and HPE Aruba Networking Central · Dynamic segmentation
You are troubleshooting a User-Based Tunneling (UBT) deployment. A client successfully authenticates via 802.1X, and the ClearPass Access Tracker shows an ACCEPT response with the correct user role assigned. However, the client's traffic is not reaching the centralized gateway cluster, and local show commands on the switch indicate the tunnel has not been established. What is the most likely cause of this issue?
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Correct answer: A
For UBT to function, the access switch must have a control plane connection to the gateway cluster. If the 'tunneled-node-server' configuration is missing, incorrect, or the gateway is unreachable via the Layer 3 underlay, the GRE tunnel cannot be bootstrapped, even if ClearPass sends the correct role.
flowchart LR Client[Client Device] -->|802.1X Auth| Switch[AOS-CX Access Switch] Switch -->|RADIUS| CPPM[ClearPass] CPPM -.->|DUR + UBT Policy| Switch Switch ===|GRE Tunnel| Gateway[Aruba Gateway] - Question 5Beginner
Configure and validate security features in CLI and HPE Aruba Networking Central · AAA and access security
True or False: In a zero-trust dynamic segmentation environment, ClearPass Policy Manager can profile devices using DHCP fingerprinting to assign specific restrictive user roles to headless IoT devices that cannot perform 802.1X authentication.
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Correct answer: A
True. ClearPass Policy Manager utilizes device profiling (such as DHCP fingerprinting, MAC OUI, and HTTP User-Agent parsing) to identify the specific type of IoT device. Once identified, ClearPass can dynamically assign a highly restrictive user role (via MAC Authentication) tailored to that specific device type.
- Question 6Intermediate
Configure and validate dynamic routing · OSPF
An enterprise network uses OSPF across multiple areas to route traffic efficiently. Area 10 is configured as a Totally Stubby Area to minimize the routing table size on the branch switches. Which type of Link-State Advertisement (LSA) is exclusively injected into Area 10 by the Area Border Router (ABR) to provide connectivity to the rest of the network?
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Correct answer: C
In a Totally Stubby Area, the ABR blocks all Type 3 (inter-area), Type 4, and Type 5 (external) LSAs from entering the area. To ensure routers inside the area can still reach outside destinations, the ABR injects a single Type 3 Summary LSA containing a default route (0.0.0.0/0).
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