HPE4-A53 HPE Network Switching Expert Practical Exam Practice Questions
Prepare for HPE4-A53 with more than an answer.
- Questions on the exam
- 4 questions (scenarios)
- Passing score
- 66%
- Level
- Expert
- Valid for
- 3 years
Domains covered on the exam 5
- Configure and validate security features in CLI and HPE Aruba Networking Central20%
- Configure and validate dynamic routing20%
- Migrate a network to Layer 3 services, routing, and overlay in CLI and HPE Aruba Networking Central20%
- Configure, validate, and optimize a complex multicast scenario20%
- Diagnose and resolve a complex network issues20%
- 1
You are migrating a complex data center to a spine-leaf architecture using an eBGP underlay. To prevent routing loops, eBGP inherently drops updates if its own Autonomous System Number (ASN) is found in the AS_PATH attribute. However, to simplify automation, all leaf switches are configured with the exact same ASN. Which BGP feature must be configured on the spine switches to allow routes from one leaf to be advertised to another leaf?
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Correct answer: D
When 'as-override' is configured on the spine switches (the provider), the spine replaces the originating leaf's ASN in the AS_PATH with its own ASN before forwarding the route to other leaf switches. This bypasses the eBGP loop prevention mechanism and allows leaves sharing the same ASN to communicate.
- 2
A network engineer is designing a multi-area OSPF network on AOS-CX. Area 20 must support external routes redistributed from a legacy RIP network connected to an edge router within Area 20. However, to conserve memory, Area 20 should NOT receive any external routes (Type 5 LSAs) from the rest of the OSPF domain. Which TWO statements describe the required configuration and resulting behavior? (Select TWO)
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Correct answer: B, C
In an NSSA, the ASBR injects external routes as Type 7 LSAs. When these reach the ABR, the ABR translates them into standard Type 5 LSAs to flood into the rest of the OSPF domain.
An NSSA blocks standard Type 5 external LSAs from entering the area from the backbone, while simultaneously allowing an ASBR inside the area to inject external routes.
- 3
A large enterprise data center has a full-mesh iBGP topology that is facing control-plane scalability issues due to the high number of TCP sessions required. The architect decides to implement BGP Route Reflectors (RRs) to reduce the session count.
graph TD RR1[Route Reflector 1] --- C1[Client 1] RR1 --- C2[Client 2] RR2[Route Reflector 2] --- C1 RR2 --- C2 RR1 --- RR2The design includes dual RRs (RR1 and RR2) in the same cluster for redundancy. After implementation, a network engineer notices that Client 1 is dropping specific routing updates received from RR2. These dropped updates originally originated from Client 1 itself.
Which BGP attribute is responsible for preventing this specific routing loop in a Route Reflector topology?
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Correct answer: B
When a Route Reflector reflects a route, it attaches the ORIGINATOR_ID attribute, which contains the BGP Router ID of the router that originally injected the route into the AS. If a client receives an update where the ORIGINATOR_ID matches its own Router ID, it silently drops the update to prevent a routing loop.
- 4
A network administrator is configuring port-based access control on an AOS-CX switch for a mixed environment of corporate laptops and headless IoT devices (like IP cameras). Which authentication method should be prioritized to securely authenticate the IoT devices that lack the ability to install certificates or run specialized supplicant software?
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Correct answer: A
MAC Authentication is ideal for headless IoT devices (like printers, IP cameras, and HVAC sensors) that do not have the native capability to run an 802.1X supplicant or present user credentials. The switch sends the device's MAC address to the RADIUS server (e.g., ClearPass), which can then profile the device and return the appropriate access role or VLAN.
- 5
In an HPE Aruba Networking dynamic segmentation architecture utilizing User-Based Tunneling (UBT), what is the primary role of the ClearPass Policy Manager (CPPM) during the client onboarding process?
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Correct answer: C
In a dynamic segmentation design, ClearPass Policy Manager (CPPM) evaluates the authentication request and returns a RADIUS Access-Accept message containing a Downloadable User Role (DUR). This DUR instructs the AOS-CX access switch on how to handle the client's traffic, including instructions to tunnel the traffic to a gateway via UBT.
- 6
An expert network engineer is designing a classifier policy on an AOS-CX switch to prioritize voice traffic (DSCP EF) and drop unauthorized video streaming traffic. Which TWO components are strictly required when configuring and successfully applying this classifier policy in the CLI? (Select TWO)
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Correct answer: B, C
The policy ties the class (match criteria) to an action (like drop, rate-limit, or trust). Without the policy, the class does nothing. The policy is then applied to an interface, VLAN, or user role.
In AOS-CX, implementing advanced QoS or security policies requires a 'class' to define WHAT traffic to look for (the match criteria), and a 'policy' to define WHAT ACTION to take on that matched traffic. Both are strictly required.
