HPE7-A08 Exam Dumps - HP Aruba Certified Switching Expert Questions and Answers

For BGP in a multi-homed configuration advertising public IP blocks, the AS number should be a valid public AS number allocated by the regional internet registry (RIR). Numbers in the private AS range (64512–65534) are not suitable for public Internet announcements.

63472 falls in the public AS range (16-bit AS numbers below 64512).

64813, 65535, and 65218 are in the private or reserved range.

Therefore, 63472 is an example of a suitable public AS number.

The question concerns an OSPF configuration where the interface does not come up as expected.

Common reasons for no OSPF adjacency or interface participation include:

Interfaces being passive (no adjacency formed)

Mismatched OSPF process IDs

Missing loopback interfaces (for router ID)

Layer-3 interfaces not associated with VRFs when VRFs are configured

Option D (a Layer-3 interface has not been associated with a VRF) is the root cause because in Aruba CX switches, when VRF is configured, all Layer-3 interfaces that participate in OSPF must be associated with the correct VRF instance to establish adjacency and participate correctly.

If an interface is not part of the VRF configured for OSPF, it will not appear in the OSPF interface list or form neighbors.

The Network Analytics Engine (NAE) is the most appropriate tool for troubleshooting an intermittent condition that must be detected and correlated with the exact time of occurrence . NAE runs directly on AOS-CX switches and continuously monitors selected operational resources using programmable agents, rules, and time-series data.

HPE Aruba specifically uses BGP neighbor state as an example of an NAE monitoring use case. An agent can monitor a particular BGP neighbor and automatically execute an action when that neighbor transitions from UP to DOWN. This is especially useful for intermittent failures because the engineer does not need to be watching the CLI when the condition occurs. Aruba Networks

NAE also maintains a built-in time-series database , allowing monitored data to be correlated over time and reviewed around the failure event. Aruba Networks Events generated by NAE contain an explicit timestamp , along with the triggering condition, monitor, time-series resource, and observed value. This provides precise temporal correlation for an intermittent BGP problem. Aruba Networks

Syslog can record events but lacks NAE ' s integrated programmable monitoring and time-series correlation. An SNMP GET is a point-in-time query and can easily miss an intermittent condition. Central provides centralized monitoring, but NAE is specifically designed for real-time, switch-resident event detection and automated troubleshooting data collection .

Study Guide References: Network Analytics Engine; NAE Agents and Scripts; Time-Series Database; BGP Neighbor Monitoring; Event Rules and Automated Actions.

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Comprehensive Detailed Explanation:

To prevent man-in-the-middle attacks based on Layer 2 (Ethernet) addressing, enabling ARP inspection in the VLAN context is recommended. ARP inspection validates ARP packets and ensures only legitimate ARP responses are forwarded.

Enabling ARP inspection at VLAN level allows granular control.

Interface-level or global context is less typical or supported for ARP inspection on Aruba CX switches.

The command erase all zeroize performs a secure erase on the switch, which deletes all customer data including startup-config and stored credentials. This process can take up to an hour depending on the hardware and storage media.

It does not retain running config (Option A).

It does not restore the factory AOS-CX image (Option B).

Admin credentials are deleted as part of the secure erase (Option C is incorrect).

Therefore, this command securely wipes all data and resets the device.

The LACP fallback command in Aruba VSX configurations allows the system to continue forwarding traffic even if LACP negotiation fails or is not established. This is useful when provisioning a gateway or link that does not support LACP, ensuring that the port remains operational in a static manner.

It is not specifically for backward compatibility with LACP v1.

It does not relate to operation with a single partner interface.

It also is not about active/passive LACP modes per se.

Therefore, LACP fallback is configured to support provisioning a gateway without LACP.

An eBGP relationship is established between BGP routers belonging to different autonomous systems . In this scenario, the local Aruba AOS-CX switch operates in AS 65010 , while the neighboring router belongs to AS 65100 , making the relationship external BGP. AOS-CX defines the neighbor ' s AS with the neighbor < IP-address > remote-as < AS-number > configuration; for this topology, the remote AS would be 65100 . HPE Aruba documentation confirms that an eBGP neighbor ' s remote AS must differ from the local BGP AS. Aruba Networks Developer Hub

By default, AOS-CX permits an external BGP session to be established with a directly connected external peer . HPE Aruba specifically documents that eBGP peers on non-directly-connected networks require neighbor ... ebgp-multihop; therefore, ordinary eBGP operation assumes direct connectivity. Aruba Networks

A route reflector is an iBGP scaling mechanism , not an eBGP establishment requirement. Option D is also incorrect because AOS-CX uses address-family ipv4 unicast, rather than an “ipv4 internal” address family. Option A specifies AS 65001, which does not correspond to the stated remote AS 65100.

Study Guide References: BGP Fundamentals; eBGP Neighbor Establishment; neighbor remote-as; eBGP Multihop; IPv4 Unicast Address Family.

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The Aruba CX switches REST API supports the JSON (JavaScript Object Notation) data format for both requests and responses. JSON is widely adopted for REST APIs due to its lightweight and readable format.

XML and YAML are not supported for REST API on CX switches.

SOAP is a different protocol not used by Aruba CX REST API.

Therefore, JSON is the correct and supported data format.

The configuration explicitly contains ip igmp version 2 , which overrides the normal AOS-CX IGMP version selection for this Layer 3 VLAN interface. HPE Aruba Networking documents the default IGMP version as IGMPv3 . The ip igmp version < VERSION > command permits either version 2 or version 3, and removing the explicit version configuration restores the interface to the default of IGMPv3 . Therefore, configuring version 2 represents a custom, non-default IGMP version , making option D correct. Aruba Networks

The commands have separate multicast functions. ip igmp enable enables IGMP operation on VLAN 2222 so the Layer 3 interface can process multicast membership information from attached receivers. ip pim-sparse enable enables PIM Sparse Mode on that routed interface, allowing the switch to participate in multicast routing and build multicast distribution trees toward other PIM routers. HPE Aruba configuration examples show PIM-SM and IGMP enabled together on receiver-facing routed interfaces. Aruba Networks

PIM is therefore not a requirement for ordinary Layer 2 multicast forwarding , and neither is it required merely to perform generic local Layer 3 unicast routing. Its role is specifically multicast routing between Layer 3 interfaces .

Study Guide References: IGMP Configuration; IGMPv2/IGMPv3; PIM Sparse Mode; Multicast Receiver Membership; Layer 3 Multicast Routing.

When a recent routing change causes an outage affecting all users, the recommended immediate action is to restore the last-known working configuration to quickly return the network to a stable state. This is critical to minimize downtime and impact.

Asking customers to send logs or explaining the issue takes time and delays remediation.

Collecting show tech and opening TAC cases can be done after restoring service.

Hence, the quickest way to mitigate the impact is to restore the last known good configuration.