Free HP HPE7-A08 Practice Exam with Questions & Answers | Set: 4

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.

When VSX peers are being managed through HPE Aruba Networking Central, VSX configuration synchronization must be handled carefully , particularly when the configuration state of the two peers is not identical or one peer is incomplete. Therefore, VSX sync can have configuration synchronization issues , making option B correct.

HPE Aruba documents multiple VSX configuration-sync conditions, including CONFIGURATION_SYNC_CONFLICT and CONFIGURATION_SYNC_MISSING_REFERENCE . A conflict can occur when configuration on the primary is marked for synchronization but corresponding configuration on the secondary creates a synchronization conflict; a missing-reference condition occurs when synchronized configuration depends on an object or configuration element that is absent. Aruba Networks

Central documentation additionally warns against enabling or manipulating certain vsx-sync configurations through Central , because synchronization can modify the peer and potentially leave it in an unknown configuration state. In MultiEdit specifically, HPE states that vsx-sync commands in subcontexts should not be added, edited, or deleted. Aruba Networks

This does not mean MultiEdit itself is unavailable, eliminating A. Central also supports AOS-CX configuration through its UI, eliminating D. There is likewise no general requirement that VSX switches must run 10.13.x or later merely for Central management; Central Managed mode supports substantially earlier AOS-CX releases. Aruba Networks

Study Guide References: VSX Configuration Synchronization; vsx-sync; Central MultiEdit; Configuration Sync Conflicts; VSX Peer Management.

If both switches are configured with default spanning-tree priorities and both appear as primary root bridges, to have a single spanning tree domain, matching MST configuration (Multiple Spanning Tree) must be created on Core-2 to align with Core-1.

Setting priority to 1 on one switch can help but matching MST configurations is the recommended approach for multiple VLANs.

Creating MST instances on only one switch will not ensure consistency.

Matching MST configurations ensures consistent root bridge election and stable spanning tree.

To interpret AOS-CX event logs correctly for the ACP-S exam, you must understand the syntax used by the VSX Daemon (hpe-vsxd) when reporting the status of Multi-Chassis Link Aggregation Groups (MC-LAGs).

Anatomy of the Log Message:

hpe-vsxd: This indicates the message is generated by the VSX synchronization process.

VSX 2: This refers specifically to Virtual Port Channel (or VSX LAG) ID 2. It does not refer to the switch member ID, but the logical LAG ID.

State local down: This means the physical member ports assigned to LAG 2 on the switch you are currently logged into (the " local " switch) are operationally down.

remote up: This indicates that via the Inter-Switch Link (ISL), the switch has learned that its VSX peer (the " remote " switch) still has its physical member ports for LAG 2 in an " up " state.

Operational Impact: In a healthy VSX environment, an MC-LAG should ideally show " local up, remote up. " When a log shows " local down, remote up, " it signifies a partial failure of the multi-chassis aggregation. Traffic destined for the device connected to LAG 2 will now only flow through the peer switch.

Why other options are incorrect:

Option A: If the secondary switch were down entirely, the " remote " status would typically be reported as " down " or " unknown " because the ISL/Keepalive synchronization would be lost.

Option B: If it were down on both, the log would read " local down, remote down. "

Option D: Keepalive failures are reported with different Event IDs (typically involving the " keepalive " keyword) and affect the overall VSX role state (Split-Brain recovery), not a specific LAG ID.

Key Practice Tip: Always look for the keywords local and remote in VSX logs. They provide an immediate health snapshot of the synchronized state between the two core switches.

Colorless ports allow network devices to move or replace endpoints without changing port-level configurations, typically by automatically assigning network policies dynamically to any port.

HPE Aruba’s solution for colorless ports is the VNBT (Virtual Network Boundary Tagging) feature. VNBT allows dynamic segmentation of traffic, so ports can automatically take on the policies assigned to devices regardless of physical port location.

VRRP is a first-hop redundancy protocol and unrelated to port colorlessness.

VSF (Virtual Switching Framework) is for switch stacking.

VRF (Virtual Routing and Forwarding) is for traffic segmentation.

Thus, VNBT is the correct feature to meet colorless port requirements.

On AOS-CX, the authorized DHCP server list is configured at global/VRF scope rather than within an individual VLAN . The relevant configuration is therefore to enable DHCPv4 snooping globally and add 10.100.100.10 to the authorized-server list. HPE Aruba documents the command as dhcpv4-snooping authorized-server < IPV4-ADDR > [vrf < VRF-NAME > ]; in newer AOS-CX releases, the dhcpv4-snooping keyword has been superseded by dhcp-snooping. Aruba Networks

The authorized-server mechanism causes DHCP replies received through trusted paths to be accepted only when their server address appears in the permitted list. HPE ' s DHCP snooping sample configuration shows the same operational sequence: enable DHCP snooping globally, enable it on the required client VLANs, configure the trusted server-facing/uplink interface, and then configure the authorized DHCP server globally. Aruba Networks

Therefore, neither VLAN 100 nor VLAN 20 is the configuration context for the authorized-server command. Option D is also syntactically incorrect because dhcpv4-snooping trust is an interface-level operation; it trusts the port/path, not a server IP address. For VLAN 20 to be protected, DHCP snooping must additionally be active on VLAN 20. Aruba Networks

Study Guide References: DHCPv4 Snooping; Authorized DHCP Servers; Trusted/Untrusted Interfaces; DHCP Relay Across VLANs; DHCP Snooping Security.

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.

Colorless Ports is a foundational concept in Aruba’s Dynamic Segmentation strategy. It refers to a switch configuration where all access ports are configured identically, and the network identity of the port changes dynamically based on the device that plugs into it.

Role of 802.1X: To achieve a colorless port, the switch must first identify the device or user. 802.1X (Port-based Network Access Control) is the industry-standard method for providing this identification. When a device connects, the switch challenges it for credentials. Based on the response, the RADIUS server tells the switch which " User Role " to apply, which then sets the VLAN, QoS, and ACLs.

Complementary Methods: While 802.1X is the primary answer here, colorless ports also frequently utilize MAC Authentication for devices that do not support 802.1X (like printers).

Evaluating Other Options:

Option A: 802.1Q is the standard for VLAN tagging. While colorless ports use VLANs, 802.1Q is a static trunking/tagging protocol and does not provide the " dynamic " intelligence required for a colorless environment.

Option C: 802.11X is a common " trick " option on exams. 802.11 is the standard for Wireless (Wi-Fi), and there is no specific " 802.11X " protocol used for wired switch port security.

Option D: 802.1AD refers to " QinQ " or double-tagging, used primarily in service provider environments to tunnel customer VLANs. It has no relevance to the colorless port security model.

HPE Aruba Networking AOS-CX is a cloud-native, database-driven operating system designed to move away from traditional, " brittle " management methods toward Network Automation and AIOps.

REST API (Option A): In AOS-CX, the entire system state is stored in a database (ASDB). The switch provides a 100% " REST-ful " API, meaning every single feature, configuration, and statistical counter that can be accessed via the CLI can also be accessed programmatically via REST. This allows for modern automation, integration with custom dashboards, and DevOps workflows.

NAE (Network Analytics Engine) (Option D): This is a hallmark " modern " feature of AOS-CX. NAE provides a built-in framework for monitoring and troubleshooting. It uses Python-based agents to monitor the local database for specific events (like a spike in CPU or an OSPF state change) and can take automated actions (like capturing a packet trace or generating a log). It provides a graphical representation of network health directly in the Web UI.

Why other options are incorrect:

Option C (SNMP): While supported, SNMP is considered a legacy protocol. It is relatively slow, lacks security (in v1/v2c), and is typically used for monitoring only, rather than the " modern management " and automation logic found in REST or NAE.

Options B and E: YAML and XML are data serialization formats. While they are used by modern management tools (like Ansible using YAML or NETCONF using XML), they are not management " approaches " or native switch features in the same way that a REST API or an Analytics Engine is.

To monitor BGP neighbor state changes and automatically create a helpdesk ticket, the NAE (Network Analytics Engine) action to use is a REST API call. This allows integration with external ticketing or automation systems, enabling automated ticket creation when a monitored event occurs.

Executing shell commands, sending emails, or generating logs are limited to internal actions and do not integrate as seamlessly with helpdesk systems.

REST API calls allow custom integration and automation.