HPE7-A06 HPE Campus Access Switching Expert Written Exam Questions and Answers

The question requires matching the default BGP keepalive and hold-down timers on AOS-CX switches to their respective values.

Analysis of Options:

Keepalive Timer:The keepalive timer determines how often BGP keepalive messages are sent to maintain a session. The default value on AOS-CX switches is 60 seconds.

Hold-down Timer:The hold-down timer specifies the maximum time a BGP session can remain active without receiving a keepalive or updatemessage before it is considered down. The default value on AOS-CX switches is 180 seconds.

Why This Mapping is Correct:Per BGP standards (RFC 4271) and HPE Aruba Networking AOS-CX documentation, the default BGP keepalive timer is 60 seconds, and the hold-down timer is 180 seconds (three times the keepalive interval). These timers ensure BGP sessions remain stable while allowing timely detection of peer failures. The AOS-CX implementation adheres to these defaults unless explicitly configured otherwise.

Relevance to Certification Objectives:

Routing (16%):Involves designing and troubleshooting BGP routing topologies, including timer configurations.

Troubleshooting (10%):Includes diagnosing BGP session issues related to timers.

The goal is to add a static route on Router-1 to allow clients in VLAN 10 (subnet 10.2.10.0/24, presumably in VRF 'IoT-Medical' based on options) to reach services in the 10.1.100.0/24 subnet. The exhibit indicates interface 1/1/1 (IP 10.255.101.10/24) is in VRF 'service', and the likely next hop towards the destination is Core-1 at 10.255.101.11 (also implied to be reachable via VRF 'service'). This requires adding a route in the source VRF ('IoT-Medical') pointing towards the destination via the next hop in the 'service' VRF.

Static Route Syntax (with VRF):ip route [vrf ]

Analysis of Options:

A: Claims Core-1 isn't in VRF 'service', contradicting the likely setup.

B: Uses unusual interface:ip syntax (1/1/1:10.255.101.11). Defines the route in VRF 'IoT-Medical'.

C: Uses interface 1/1/1 as the next hop. This is less specific than using the IP address and relies on the interface being point-to-point or having proxy ARP enabled. Defines the route in VRF 'IoT-Medical'.

D: ip route 10.1.100.0/24 10.255.101.11 vrf IoT-Medical. This uses the standard syntax to define a static route for the destination 10.1.100.0/24 via the next-hop IP 10.255.101.11 within the context of the IoT-Medical VRF. The successful function of this route depends on inter-VRF routing (route leaking) being configured between 'IoT-Medical' and 'service' VRFs, but the command itself correctly defines the desired static route.

Conclusion:Option D provides the correct and standard command syntax to configure the required static route within the specified source VRF ('IoT-Medical').

The question asks which tables are synchronized between a pair of CX 8325 switches in a Virtual Switching Extension (VSX) cluster. VSX is a high-availability solution that synchronizes specific tables to ensure consistent operation across both switches.

Analysis of Options:

A. BGP Neighbors:BGP neighbor tables are not synchronized in VSX; each switch maintains its own BGP sessions.

B. MAC address:Correct. VSX synchronizes the MAC address table to ensure consistent Layer 2 forwarding across both switches.

C. Spanning-Tree Protocol (STP):STP states are not synchronized; each switch runs its own STP instance, though they coordinate to avoid loops.

D. IP Routing:Correct. VSX synchronizes the IP routing table to ensure consistent Layer 3 forwarding.

E. Link Layer Discovery Protocol (LLDP):LLDP information is not synchronized; each switch maintains its own neighbor information.

Why B and D are Correct:In a VSX cluster, the MAC address table and IP routing table are synchronized to ensure seamless Layer 2 and Layer 3 operations. This synchronization allowsboth switches to share a common view of the network, enabling features like active-active forwarding and hitless failover. The vsx-sync feature in AOS-CX ensures these tables are kept consistent across the VSX pair.

Relevance to Certification Objectives:

Network Resiliency and Virtualization (8%):Involves designing and troubleshooting VSX for resiliency and redundancy.

Switching (19%):Includes implementing and troubleshooting Layer 2 technologies like MAC address tables.

Routing (16%):Covers IP routing table synchronization in VSX environments.

The question involves a client wanting to use the HPE Aruba Networking Switch Multi-Edit Software function in HPE Aruba Networking Central to manage multiple switches. The task is to identify the available option.

Analysis of Options:

Option A (Use templates and apply them to selected switches):Incorrect. Templates are used for configuration management in Central but are not part of the Multi-Edit Software function.

Option B (Apply a configuration to an interface range for selected switches):Incorrect. Multi-Edit focuses on CLI scripting, not specifically interface range configurations.

Option C (Run the same NAE scripts for selected switches):Incorrect. Network Analytics Engine (NAE) scripts are for monitoring, not configuration via Multi-Edit.

Option D:Correct. Multi-Edit Software in Central allows administrators to apply CLI scripts to multiple selected switches for configuration changes.

Why Option D is Correct:HPE Aruba Networking Central’s Multi-Edit Software feature enables administrators to create and apply CLI scripts to multiple AOS-CX switches simultaneously, streamlining configuration tasks. This is particularly useful for bulk changes, such as VLAN configurations or policy updates, across selected switches. The feature supports direct CLI input or script uploads, ensuring consistent application of commands, as per HPE Aruba Networking’s management tools. This aligns with the client’s need for efficient multi-switch management.

Relevance to Certification Objectives:

Connectivity (9%):Developing configurations for multiple devices based on customer requirements.

Troubleshooting (10%):Applying consistent configurations to resolve network issues.

Network Stack (4%):Analyzing solutions for network management automation.

The question asks for the reason for using WPA3-Enterprise (CCM-128) when deploying Wi-Fi 6 networks.

WPA3-Enterprise Modes:

CCM-128:Uses AES-CCMP-128 (same cipher as WPA2). Its main purpose is to provide a transition path from WPA2 to WPA3. It allows both WPA3-capable and WPA2-only clients to connect to the same SSID. It enforces Protected Management Frames (PMF, 802.11w) when possible(required for WPA3, optional for WPA2). It's often called "Transition Mode" or "Compatibility Mode".

GCMP-256:Uses stronger AES-GCMP-256. It operates in "WPA3-Only Mode" and doesnotallow WPA2 clients.

Wi-Fi 6 (802.11ax) & WPA3:Wi-Fi 6 certification requires support for WPA3.

Analysis of Options:

A: Incorrectly calls CCM-128 "192-bit mode" and "WPA3 only".

B: Correctly calls CCM-128 "Transition Mode" and states it allows WPA2 clients.

C: Correctly calls CCM-128 "Compatibility Mode" and states it allows WPA2 clients. "Compatibility Mode" and "Transition Mode" are used interchangeably for this WPA3 mode.

D: Incorrectly calls CCM-128 "Only Mode" and states no WPA2 support.  

Conclusion:Both Option B and Option C accurately describe WPA3-Enterprise (CCM-128). It is designed as a transition/compatibility mode to allow environments to adopt WPA3 features (like mandatory PMF for capable clients) while still supporting legacy WPA2 clients on the same network during the migration period. Selecting either B or C would be functionally correct based on common terminology.

 Analyze Topology and Existing Configuration:

RouterA (AS 64500) peers with RouterB (AS 64512) using eBGP.

Peering is configured between loopback interfaces (RouterA Lo0 10.3.0.3 to RouterB Lo0 10.255.0.12).

Two parallel physical links connect the routers (10.255.102.0/30 and 10.255.102.4/30).

RouterA has two static routes pointing to RouterB's loopback (10.255.0.12/32), one via each physical link's next hop (10.255.102.1 and 10.255.102.5). This provides reachability to the BGP peer address over both paths.

RouterA's BGP config activates the neighbor 10.255.0.12 for IPv4 unicast but is missing key commands for stable loopback peering and load balancing.

 Goal:Permit load balancing for traffic exchanged via BGP between RouterA and RouterB. This requires BGP ECMP (Equal Cost Multi-Path).

 Requirements for eBGP ECMP over Loopbacks:

Stable Peering:Peering must use loopback addresses. This requires:

update-source loopback : To source BGP TCP packets from the loopback IP.

ebgp-multihop : Because loopbacks are not directly connected (TTL > 1 needed).

ECMP Enabled:BGP must be configured to allow multiple paths in the routing table. This requires:

maximum-paths (or maximum-paths ebgp ): To allow more than the default 1 path.

Equal Paths:BGP must see multiple paths to thesameprefix learnedfrom RouterBthat are considered equal based on BGP path selection attributes (Weight, Local_Pref, AS_Path, Origin, MED, etc.). Since routes are learned from the same neighbor IP (RouterB's loopback), these attributes will likely be identical for routes learned via this peering. RouterA already has equal static routestothe BGP next hop (10.255.0.12).

The issue involves users roaming to APs connected to a test switch failing to receive an IP address on the corporate Wi-Fi network (bridged mode), with ClearPass reporting a RADIUS Aruba-User-Role attribute of Access_Point. The goal is to identify the configuration change needed to resolve this issue.

Analysis of Options:

Option A (port-access client-move enable):Enables client movement between ports but does not address the AP authentication issue.

Option B (aaa authentication port-access client-limit 0):Correct. Setting the client limit to 0 on the switch ports (1/1/1–1/1/48) disables MAC authentication for APs, allowing them to be treated as trusted devices and preventing the application of an incorrect role.

Option C (port-access onboarding-method concurrent enable):Enables concurrent onboarding but is unrelated to the AP role issue.

Option D (port-access role Access_point auth-mode device-mode):Configures a device mode role but does not resolve the IP assignment issue caused by incorrect authentication.

Why Option B is Correct:The issue arises because the switch is applying 802.1X or MAC authentication to the AP ports, resulting in ClearPass assigning the Access_Point role, which restricts client connectivity. By setting aaa authentication port-access client-limit 0 on the AP-connected ports (1/1/1–1/1/48), the switch disables port-access authentication for these ports, treating the APs as trusted devices. This allows clients to authenticate properly via the AP and receive IP addresses in bridged mode, resolving the issue.

Relevance to Certification Objectives:

WLAN (9%):Involves troubleshooting wireless functions and Layer 2 issues related to AP connectivity.

Authentication/Authorization (9%):Includes troubleshooting ClearPass integration and 802.1X configurations.

Security (10%):Covers troubleshooting wired 802.1X implementations.

The setup has Agg-1 and Agg-2 as a VSX pair with IGMPv3 enabled. Ace-1 is a downstream switch connected to clients. The question asks which switch becomes the IGMP querier for clients connected to Ace-1.  

IGMP Snooping & Querier:In a Layer 2 network using IGMP snooping, an IGMP querier is required on each VLAN to periodically send general queries. This prompts hosts to send membership reports, allowing snooping switches to learn which ports need which multicast streams.

Querier Election:If multiple devices capable of querying exist on a VLAN (like routers or capable switches), an election occurs. Typically, the device with the lowest IP address on the VLAN becomes the querier.

VSX & IGMP Querier:In an ArubaOS-CX VSX environment, the IGMP querier functionality is managed by the VSX pair. Documentation indicates that theprimary VSX switchtypically assumes the role of the IGMP querier for the VLANs it serves, including those extended via MC-LAG to downstream switches.

Analysis of Options:

A. Agg-2: Would only be the querier if it were the primary VSX switch.

B. Both Agg-1 and Agg-2: Incorrect, only one active querier per VLAN is standard.

C. Agg-1: Likely the primary VSX switch (often designated or wins election based on priority/lower system MAC/IP) and thus becomes the querier.

D. Active gateway IP: This is the virtual IP used for unicast routing, but the querier function runs on a physical switch, usually the primary.

Conclusion:Assuming Agg-1 is the primary VSX switch (as is common convention or based on default election parameters if not explicitly configured), it will act as the IGMP querier for the VLAN serving clients connected to Ace-1.

The scenario describes two separate VSX clusters interconnected via MC-LAG, where both clusters are configured to use theexact samevirtual IP address and virtual MAC address for their respective Active Gateway SVIs.

Active Gateway Scope & Conflict:Active Gateway provides a highly available default gatewaywithina single VSX cluster (L2 domain). The vIP/vMAC combination should be unique within its L2 broadcast domain.

Interconnecting Clusters with Same vIP/vMAC:When two VSX clusters using the identical Active Gateway vIP/vMAC are interconnected at Layer 2 (even via MC-LAG), this creates a situation where the same active L2 (vMAC) and L3 (vIP) address exists in multiple places within the extended broadcast domain.

Consequences:This leads to MAC address conflicts and L3 ambiguity. ARP resolution becomes unreliable, potentially causing ARP tables to flap on connected devices. Traffic forwarding becomes unpredictable, as packets destined for the vIP/vMAC might be delivered to the "wrong" cluster. This unstable and unpredictable state is sometimes referred to as an asymmetric or "async" setup.

Analysis of Options:

A: ISL traffic might change, but it's a symptom, not the root problem.

B: Multiple ARP replies would occur, contributing to the confusion.

C: The configuration results in an "async setup," accurately describing the unstable state caused by duplicate active L2/L3 addresses across the interconnected L2 domain.

D: Load-balancing happens within a cluster; this setup causes conflict, not predictable load balancing across clusters.

Conclusion:Reusing the same Active Gateway vIP and vMAC across interconnected VSX clusters is not a valid design and leads to an unstable, asymmetric ("async") environment due to address duplication within the extended L2 domain. Option C best describes this problematic outcome.

The client wants to automate troubleshooting processes and gain better visibility into their network. We need to identify the recommended Aruba solution.  

Analysis of Options:

A. HPE Aruba Networking Fabric Composer: A tool primarily for data center fabric provisioning and management, not general campus troubleshooting automation.  

B. HPE Aruba Networking Switch Multi-Edit Software: Likely refers to configuration management features (e.g., in Central or NetEdit) for applying changes to multiple switches, not primarily focused on automated troubleshooting or visibility.  

C. Automate processes with scripting like Python: AOS-CX supports on-box scripting (NAE) and REST APIs, enabling custom automation for monitoring and troubleshooting. While powerful, it requires development effort.  

D. AIOps integrated into HPE Aruba Networking Central: Aruba Central's AIOps capabilities are specifically designed to enhance visibility and automate aspects of troubleshooting. It uses AI/ML to analyze network data, detect anomalies, provide insights into potential issues, correlate events, and offer prescriptive recommendations, directly addressing the client's need for better visibility and automated assistance with troubleshooting.  

Conclusion:While custom scripting (C) allows automation, Aruba Central AIOps (D) is the platform-integrated solution specifically marketed and designed by HPE Aruba Networking to provide enhanced visibility and automated insights fortroubleshooting campus networks. It is the most direct and recommended solution among the options for achieving these goals within the Aruba ecosystem.

The goal is to configure a Link Aggregation Group (LAG) on a VSX cluster (pair of CX 8325 switches) that connects to an Aruba 7000 series gateway undergoing Zero Touch Provisioning (ZTP). The LAG needs to support "protocol-based port redundancy" (LACP) and allow connectivity during ZTP.

VSX Requirement:Since the LAG connects to two separate physical switches operating as a VSX pair, the LAG must be configured as a Multi-Chassis LAG (MC-LAG) on the switches. This allows the gateway to form a single LAG across both upstream devices. The command multi-chassis under the interface lag context enables this.

Protocol Redundancy Requirement:"Protocol-based port redundancy" indicates that Link Aggregation Control Protocol (LACP) should be used to dynamically negotiate and manage the LAG bundle between the switches and the gateway. The command lacp mode active enables LACP in active negotiation mode.

ZTP Requirement:During ZTP, the gateway might not have its full configuration, including LACP settings, enabled immediately. To ensure the gateway can establish basic IP connectivity for ZTP (e.g., reach Activate/Central via DHCP/DNS), the switch ports should allow traffic even if LACP negotiation hasn't completed. The lacp fallback feature enables this, allowing individual LAG member ports to become active if LACP PDUs are not received from the peer.

Analyzing the Options:

A)Configures lacp mode active and lacp fallback butlacksthe multi-chassis command required for VSX.

B)Correctly configures the LAG as multi-chassis, enables lacp mode active, and enables lacp fallback. This meets all requirements.

C)Configures multi-chassis but uses potentially older or less standard syntax lacp enable and lacp fail-over instead of lacp mode active and lacp fallback.

D)Lacks the multi-chassis command and uses potentially older/less standard syntax.

Conclusion:Option B provides the complete and correct configuration using standard AOS-CX syntax to create an MC-LAG on the VSX pair with LACP enabled for redundancy and LACP fallback enabled to support gateway connectivity during ZTP.

The question involves granting read-only access to a user with physical access to an AOS-CX switch. The task is to identify the correct command set.

Analysis of Options (Assumed Context):Read-only access is typically configured using AAA with a privilege level or role. Option C is assumed to include commands like:

text

Copy

aaa authentication login privilege-mode

user operator password plaintext

This assigns the “operator” role, which provides read-only access.

Option A:Incorrect. Likely uses an incorrect role or privilege level (e.g., admin).

Option B:Incorrect. May configure a role with excessive permissions or invalid syntax.

Option C:Correct. Configures a user with the “operator” role for read-only access.

Option D:Incorrect. Likely includes commands for a different access level or invalid configuration.

Why Option C is Correct:In AOS-CX, the “operator” role provides read-only access, allowing users to view configurations and status (e.g., show commands) without modifying settings. The command user operator password plaintext creates a local user with this role, and aaa authentication login privilege-mode ensures privilege levels are enforced upon login. This configuration is suitable for a user with physical access (e.g., via console or SSH), ensuring they cannot alter the switch, as per HPE Aruba Networking’s AAA security practices.

Relevance to Certification Objectives:

Authentication/Authorization (9%):Configuring AAA for user access control.

Security (10%):Implementing secure management access in customer networks.

Troubleshooting (10%):Ensuring proper user permissions for network management.

The correct order is:

identify

analyze

hypothesize

validate

implement

verify

This question requires arranging standard troubleshooting steps into a logical sequence. A systematic approach is crucial for effective network troubleshooting.

identify:The first step is always to clearly identify and define the problem. What are the symptoms? Who is affected? What is the scope? When did it start? Understanding the problem precisely is essential before proceeding.

analyze:Once the problem is identified, gather relevant data and analyze the situation. This involves checking logs, looking at configurations, examining network topology diagrams, checking status commands, and potentially capturing packets. This analysis helps build context around the identified issue.

hypothesize:Based on the identification and analysis, form a hypothesis (or multiple hypotheses) about the probable cause of the problem. This involves using technical knowledge and experience to theorize what might be wrong.

validate:Test the hypothesis to determine if it's correct. This step involves performing specific tests or checks designed to confirm or refute the theory. For example, if the hypothesis is a bad cable, test the cable. If it's a routing issue, check the routing table and perform trace routes. This step validates the cause before implementing a fix.

implement:Once the cause has been validated, implement the solution. This could involve replacing hardware, correcting configuration, clearing states, etc.

verify:After implementing the solution, verify that the original problem is resolved. It's also critical to check that the fix hasn't introduced any new issues. Monitor the system to ensure stability.

The question involves a VSX configuration with CX 8325 switches (agg-sw1 and agg-sw2) where SVI 10’s active-gateway is set up. For testing, SVI 10 on agg-sw1 is shutdown, and traffic from a client connected to Edge-1 is initiated toward the default route. The task is to determine the expected behavior.

Analysis of Options:

Option A:Incorrect. Traffic is not dropped, as VSX ensures redundancy via the active-gateway on agg-sw2.

Option B:Incorrect. Traffic does not traverse the ISL unnecessarily; agg-sw2 takes over directly.

Option C:Correct. Traffic continues unaffected, with a 50ms failover time for agg-sw2 to assume forwarding responsibilities for SVI 10.

Option D:Incorrect. Traffic is not dropped, and vsx-sync does not disable SVI 10 on agg-sw2; it ensures consistency.

Why Option C is Correct:In a VSX cluster with active-gateway, both switches (agg-sw1 and agg-sw2) share a virtual IP and vMAC for SVI 10, allowing either to respond to ARP requests and forward traffic. Shutting down SVI 10 on agg-sw1 triggers agg-sw2 to take over Layer 3 forwarding, leveraging the active-gateway configuration. VSX’s fast failover mechanism ensures a typical failover time of approximately 50ms, making the transition seamless for clients on Edge-1. The vsx-sync feature ensures SVI configurations remain consistent, preventing traffic disruption. This behavior aligns with HPE Aruba Networking’s VSX high-availability design.

Relevance to Certification Objectives:

Network Resiliency and Virtualization (8%):Designing and troubleshooting VSX for high availability.

Routing (16%):Ensuring seamless Layer 3 forwarding in VSX environments.

Troubleshooting (10%):Diagnosing failover behavior in campus networks.

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 ) 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).

To enable DHCP Endpoint Profiling, the switch needs to forward relevant DHCP packets from the client to the ClearPass server. The most common method is configuring the switch to act as a DHCP relay agent for the ClearPass server IP address on the client VLAN's Switched Virtual Interface (SVI).

In scenarios where port access control (like 802.1X or MAC Auth) is enabled, clients might need to send DHCP requestsbeforethey are fully authenticated. To allow this while maintaining security, a pre-authentication role with limited access (specifically allowing DHCP) can be applied to the port initially.

The logical sequence based on the provided steps, assuming a pre-authentication workflow is intended, is:

Create the role:Define the pre-authentication role container and associate it with the appropriate initial VLAN if needed.

Permit DHCP in the role:Apply an Access Control List (ACL) or policy to this role that permits the necessary DHCP traffic (UDP ports 67 and 68). The step provided only mentions UDP 67, which allows the client's initial Discover/Request packets towards the server/relay. (A complete solution requires allowing return traffic on UDP 68 as well).

Apply the role:Configure the client-facing physical interface to use this pre-authentication role before the final role is assigned post-authentication.

Configure DHCP Relay:Configure the ip helper-address command on the client's VLAN SVI. This instructs the switch to forward the DHCP packets it receives from clients in that VLAN to the ClearPass server (in addition to forwarding them to the actual DHCP server). ClearPass receives these packets and extracts information for profiling.

This sequence ensures that even before full authentication, DHCP is permitted, and the necessary packets are relayed to ClearPass for profiling.

The customer requires VLAN 151 to be configured as an isolated Private VLAN. A partial configuration was added, but the desired outcome wasn't achieved. We need to determine which configuration snippet should be addedbeforethe (unspecified) partial configuration to correctly set up the Private VLAN structure.

Private VLAN Configuration Fundamentals:

APrimary VLANmust be defined. This VLAN carries traffic between promiscuous ports and ports in associated secondary VLANs.

Secondary VLANs(either isolated or community) are associated with the primary VLAN.

Ports are then mapped to either the primary VLAN (promiscuous ports, typically router/firewall connections) or a secondary VLAN (host ports). Isolated ports within thesameisolated VLAN cannot communicate with each other.

Analyzing the Options (Assuming VLAN 15 is the intended Primary):

A)

vlan 15

private-vlan primary

vsx-sync

This correctly defines VLAN 15 as the Primary Private VLAN. The vsx-sync command ensures this configuration is synchronized across a VSX pair (relevant if applicable). This is the necessary prerequisite before defining VLAN 151 as an isolated secondary VLAN and associating it with VLAN 15.

B)isolated-vlan primary is incorrect syntax. The command is private-vlan primary.

C)primary-vlan isolated 151 is incorrect syntax for defining either the primary or secondary VLAN type/association within the primary VLAN context.

D)private-vlan isolated 151 within the vlan 15 context is incorrect syntax. The private-vlan isolated command belongs under the configuration of the secondary VLAN (VLAN 151 in this case).

Conclusion:Before configuring VLAN 151 as private-vlan isolated and associating it, the primary VLAN must be defined. Option A correctly shows the command (private-vlan primary) under the intended primary VLAN's configuration (vlan 15) to establish it as the primary VLAN.

The question involves a customer experiencing performance degradation due to periodic overutilization of ToR-1 uplinks to legacy Core-1 and Core-2 switches. The proposed solution is to migrate to CX 6400 series switches, and the task is to identify which aspects of the CX 6400 platform address the issue while adhering to HPE Aruba Networking best practices.

Analysis of Options:

Option A:Incorrect. The CX 6400 does not support “multi-region design” as a feature for active forwarding pathways.

Option B:Correct. Virtual Switching Framework (VSF) on the CX 6400 allows multiple active forwarding pathways by creating a single logical switch from multiple physical switches, eliminating the need for STP in the core and reducing uplink congestion.

Option C:Incorrect. Backplane stacking does not directly enable ESXi hosts to load balance using active LACP; this is unrelated to uplink utilization.

Option D:Correct. Multi-Chassis Link Aggregation (MC-LAG) allows Core-1 and Core-2 to form a single logical 802.3ad (LACP) device, enabling active-active uplinks from ToR-1 and load balancing traffic to prevent overutilization.

Why B and D are Correct:The performance degradation is caused by uplink overutilization, likely due to STP blocking redundant paths or inefficient load balancing. The CX 6400’s VSF capability combines multiple switches into a single logical device, allowing all uplinks from ToR-1 to be active without relying on STP, which often blocks redundant paths. MC-LAG further enhances this by presenting Core-1 and Core-2 as a single LACP system, enabling ToR-1 to use all uplinks actively via LACP load balancing. These features align with HPE Aruba Networking best practices for high-availability and performance in campus core deployments.

Relevance to Certification Objectives:

Network Resiliency and Virtualization (8%):Designing and troubleshooting VSF and MC-LAG for resiliency and redundancy.

Performance Optimization (6%):Analyzing and remediating uplink utilization issues.

Connectivity (9%):Applying advanced networking architectures like VSF and MC-LAG.