Important HPE7-A06 Exam Questions

Answer: C

Explanation:

The question involves a customer deploying PoE-powered IoT security devices (e.g., door locks) that must remain active during an AOS-CX switch software upgrade. The task is to identify a valid solution.

Analysis of Options:

Option A: Incorrect. A VSX pair provides redundancy but does not guarantee PoE continuity during a single switch's upgrade.

Option B: Incorrect. quick-poe reduces PoE startup time but does not ensure power during upgrades.

Option C: Correct. power-over-ethernet always-on ensures PoE remains active during software upgrades, meeting the requirement.

Option D: Incorrect. PoE priority adjusts power allocation but does not guarantee continuity during upgrades.

Why Option C is Correct: The power-over-ethernet always-on feature on AOS-CX switches ensures that PoE power delivery continues uninterrupted during software upgrades or reboots, critical for devices like IoT security door locks that require constant power. This feature prevents power cycling on PoE ports, maintaining device operation. For example, enabling it on relevant ports (e.g., interface 1/1/1 power-over-ethernet always-on) ensures compliance with the customer's requirement, as per HPE Aruba Networking's PoE high-availability guidelines.

Relevance to Certification Objectives:

Connectivity (9%): Configuring PoE for critical device deployment.

Network Resiliency and Virtualization (8%): Ensuring device uptime during maintenance.

Troubleshooting (10%): Resolving PoE continuity issues.

HPE Aruba Networking AOS-CX Configuration Guide: PoE Always-On Feature.

HPE7-A06 Study Guide: Covers PoE configuration for high-availability devices.

HPE Aruba Networking Technical Documentation: PoE Best Practices for IoT.

Answer: B

Explanation:

In an EVPN VXLAN distributed overlay network, excessive ARP packet replication (flooding) to all leaf switches is observed. We need the command to optimize this.

EVPN ARP Optimization: EVPN uses its control plane (BGP) to distribute MAC and IP address reachability information. Leaf switches (VTEPs) learn these mappings. To reduce ARP flooding across the VXLAN fabric:

ARP Suppression: VTEPs intercept ARP requests. If the VTEP already knows the MAC address for the requested IP (learned via EVPN), it can suppress the ARP request, preventing it from being flooded over VXLAN.

Proxy ARP: VTEPs intercept ARP requests. If the VTEP knows the MAC for the requested IP, it can generate an ARP reply on behalf of the remote host.

AOS-CX Commands: These features are configured within the EVPN context.

evpn arp-suppression (B): Enables the ARP suppression feature for EVPN.

evpn ip proxy-arp (C): Enables the proxy ARP feature for EVPN.

Options A and D use standard interface/VLAN level arp-suppression or proxy-arp commands, which are not specific to optimizing flooding within the EVPN VXLAN fabric itself.

Conclusion: To optimize by reducing the replication/flooding of ARP packets across the EVPN VXLAN overlay, enabling evpn arp-suppression (Option B) is the direct command. This leverages the EVPN control plane knowledge to stop unnecessary ARP flooding.

Answer: C

Explanation:

The exhibit shows the output of show vsx status on sw-agg1. Key information includes:

Config Sync Status : sw_image_version_mismatch_error

NAE : sw_image_version_mismatch_error

HTTPS Server : sw_image_version_mismatch_error

Primary Software Version: GL.10.09.0010

Secondary Software Version: GL.10.11.1021

These errors clearly indicate that the primary and secondary VSX switches are running different AOS-CX software versions. For VSX to operate correctly, including configuration synchronization and enabling features like MC-LAG interfaces, both switches in the pair must run the exact same software version.

Analysis of Options:

A: vsx-software-upgrade is used for upgrades but doesn't resolve the current mismatch requirement.

B: NAE errors are a symptom of the underlying version mismatch.

C: Using the same CX OS version on both primary and secondary switches is the fundamental requirement to clear the mismatch errors and achieve a stable VSX operational state.

D: While ServiceOS is part of the system, the primary requirement and error message relate to the main AOS-CX software version.

Answer: A, E

Explanation:

A Python developer using the REST API cannot modify the VLAN database on an AOS-CX switch. We need to identify the first settings to check.

REST API Requirements for Modification:

HTTPS Server: The REST API operates over HTTPS, so the HTTPS server must be enabled on the switch (show https-server status).

REST Interface: The REST API interface itself must be enabled (it usually is by default, check with show rest-interface).

Authentication: The API client must provide valid credentials (username/password or token) for a user account configured on the switch.

Authorization: The authenticated user account must have sufficient privileges to modify the configuration (e.g., belong to the built-in administrators group or a custom role with appropriate permissions). Check user details (show user <name>) and role permissions (show user roles).

Analysis of Options:

A . HTTPS settings: Essential for API communication. Check if enabled.

B . SSH settings: Irrelevant to REST API.

C . SNMP settings: Irrelevant to REST API.

D . REST API settings: Check if enabled (show rest-interface), but it's usually enabled by default. Less likely than A or E to be the initial problem.

E . local-user settings: Crucial for both authentication (correct credentials used?) and authorization (does the user have modification privileges?).

Conclusion: When a REST API modification fails, the most critical initial checks involve ensuring the API endpoint is accessible (HTTPS Server enabled - A) and that the user account being used for the API call has the necessary permissions (local-user settings, specifically privileges/roles - E).

Answer: B

Explanation:

The question asks for the effect of applying the command ip igmp snooping blocked vlan 5,6 on a switch port.

ip igmp snooping blocked vlan <vlan-list>: This interface configuration command instructs the IGMP snooping process on the switch to block (ignore/drop) any inbound IGMP control packets (specifically Membership Reports, i.e., 'joins', and Leave messages) received on this port for the specified VLANs (5 and 6 in this case).

Effect: By blocking IGMP join messages from hosts connected to this port, the switch will not learn about any multicast group memberships requested by those hosts in VLANs 5 and 6. Consequently, the switch will not forward multicast traffic for those groups out of this port for those VLANs (unless the port is designated as a multicast router port). It effectively prevents hosts on this port from receiving multicast streams in the specified VLANs via standard IGMP mechanisms.

Analysis of Options:

A: It results in traffic effectively being pruned because memberships aren't learned, but the command itself blocks the IGMP control packets (joins).

B: Correct. It stops the switch from accepting IGMP join messages on this port for VLANs 5 and 6.

C: Incorrect. It doesn't control inter-VLAN traffic.

D: Incorrect. It doesn't disable the entire port.

Conclusion: The command specifically blocks the reception and processing of IGMP join messages on the configured port for the listed VLANs.