HPE7-A08 Practice Questions

The qos trust dscp command is configured within an interface context on an HPE ArubaOS-CX switch. This command establishes a trust boundary, instructing the switch to honor the Differentiated Services Code Point (DSCP) value present in the IP header of incoming packets. By trusting the DSCP marking, the switch uses this value to classify the traffic and assign it to the appropriate internal quality of service queue for prioritization. This ensures that upstream QoS policies are maintained as traffic traverses the switch.

B. apply trust-dscp: This is not a valid command syntax in ArubaOS-CX for establishing a QoS trust boundary. The apply keyword is typically used for policies, not trust settings.

C. traffic trust dscp: The traffic keyword is incorrect for this context. QoS trust settings are configured under the qos command hierarchy in the ArubaOS-CX command-line interface.

D. qos enforce dscp: The enforce keyword implies a policing or rate-limiting action. This is different from trust, which simply accepts and uses the existing QoS markings for classification.

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1. HPE ArubaOS-CX 10.12 Quality of Service Guide

Page 19

Chapter 3: "Configuring QoS trust mode". The guide explicitly states

"To trust the DSCP value in the IP packet header

enter the command qos trust dscp."

2. HPE ArubaOS-CX 10.12 Command-Line Interface Guide

Page 2999

"Interface context commands". The command qos trust dscp is listed with the description: "Configures the QoS trust mode of the interface to dscp."

This command sets the Link Aggregation Group to use LACP in 'active' mode. In LACP, the operational mode (active or passive) is a property of the logical aggregate interface (the group), not the individual physical member ports. Setting the LAG to 'active' mode is the essential step to enable the switch to actively initiate LACP negotiations on all member ports. While the specific command syntax lacp group 1 mode active is not native to ArubaOS-CX, it correctly represents the concept of enabling LACP at the group level, which is the most accurate choice among the options provided. The correct ArubaOS-CX command is lacp mode active under the interface lag context.

A. LACP mode is not configured on physical interfaces, and 'enable' is not a valid LACP mode; 'active' or 'passive' are used.

C. channel-group is Cisco-specific syntax, and the 'auto' mode typically refers to the proprietary PAgP protocol, not the industry-standard LACP.

D. The LACP mode is a property of the logical LAG interface, not configured directly on a physical member port in ArubaOS-CX.

1. ArubaOS-CX 10.12 Fundamentals Guide

Page 268

"Configuring a static LACP LAG". The official documentation shows that LACP is enabled on the logical LAG interface

not the physical port. The command is lacp mode active or lacp mode passive within the interface lag configuration context. This supports the reasoning that the mode is a group-level property

making option B the most conceptually correct answer.

Document Snippet: "The LACP mode can be configured as active or passive. The default mode is passive. switch(config)# interface lag 1 switch(config-lag-if)# lacp mode active"

2. ArubaOS-CX 10.12 Link Aggregation Guide

Page 10

"LACP modes". This guide explicitly states

"LACP can be configured in active or passive mode on a LAG interface." This confirms that the LACP mode is set on the LAG interface itself

reinforcing that options attempting to configure it on a physical port (A and D) are incorrect.

Aruba Central uses Firmware Compliance policies applied to groups of devices to manage and standardize software versions. An administrator can define a specific firmware version for a group containing multiple CX switches. Central then identifies any non-compliant switches within that group and allows the administrator to schedule simultaneous or rolling upgrades to bring all devices to the desired version. This feature centralizes and automates the firmware update process across a fleet of switches, ensuring consistency and simplifying management.

A. Network Analytics Engine (NAE): NAE is an on-box framework for monitoring and troubleshooting network health using scripts. It does not manage firmware updates from Aruba Central.

C. Smart Rate Ports: This is a hardware feature (HPE Smart Rate) that enables multi-gigabit Ethernet speeds on switch ports. It is unrelated to software or firmware management.

D. Multi-Chassis Link Aggregation (MC-LAG): MC-LAG is a high-availability feature that provides device-level redundancy by creating a logical link aggregation group across two separate switches. It is a network resiliency technology, not a management tool.

1. Aruba Central User Guide: In the section "Managing Software Upgrades for Switches

" it states

"Aruba Central allows you to enforce firmware compliance across all devices in a group. At the group level

you can set a firmware version for the devices in the group and upgrade the devices that are not in compliance with the version set for the group."

Source: Aruba Central User Guide

"Managing Software Upgrades for Switches" > "Setting Firmware Compliance".

2. ArubaOS-CX 10.12 Fundamentals Guide: This guide describes the Network Analytics Engine (NAE) as a tool for network monitoring and troubleshooting through scripting

confirming it is not a firmware management feature.

Source: ArubaOS-CX 10.12 Fundamentals Guide

Chapter "Network Analytics Engine

" Page 1.

3. Aruba CX 6300 Switch Series Data Sheet: This document describes HPE Smart Rate ports as a physical layer technology for multi-gigabit connectivity (1/2.5/5GbE)

confirming its function is unrelated to firmware management.

Source: Aruba CX 6300 Switch Series Data Sheet

Page 2

"Performance and Power" section.

Dynamic Segmentation and EVPN/VXLAN are fundamental features in Aruba CX switches for modern network segmentation and security.

Dynamic Segmentation centralizes policy enforcement by tunneling user traffic from an access switch to an Aruba Gateway. This allows for consistent, role-based policies to be applied to users and devices, regardless of their connection point, effectively creating micro-segments.

EVPN/VXLAN creates a network overlay, allowing Layer 2 segments (VXLAN Network Identifiers or VNIs) to be extended across a Layer 3 underlay. This is a highly scalable method for creating macro-segments, isolating traffic between different tenants or departments across a campus or data center.

A. Virtual Switching Framework (VSF) is a stacking technology that combines multiple switches into a single logical device for simplified management and redundancy, not for traffic segmentation.

D. Smart Rate Ports are a physical layer feature that provides multi-gigabit connectivity (1/2.5/5/10 GbE) over standard cabling; they do not contribute to logical network segmentation.

1. Aruba Dynamic Segmentation Solution Guide: (Page 4

"What is Aruba Dynamic Segmentation?") "Dynamic Segmentation unifies policy enforcement for wired and wireless network access across campus and branch networks... It automates the configuration of network access policies for every user and device

segmenting traffic with a centralized policy enforcement point." This directly supports the role of Dynamic Segmentation in segmentation and security enforcement.

2. ArubaOS-CX 10.12 VXLAN Guide: (Page 7

"Introduction to VXLAN") "Virtual Extensible LAN (VXLAN) is a network virtualization technology that provides a framework for creating virtualized Layer 2 networks that span physical Layer 3 networks... EVPN is a BGP control plane for VXLAN that provides a scalable and efficient way to build and manage VXLAN-based overlay networks." This confirms EVPN/VXLAN as a core segmentation technology.

3. ArubaOS-CX 10.12 Virtual Switching Framework (VSF) Guide: (Page 7

"VSF introduction") "The Virtual Switching Framework (VSF) allows you to stack up to 10 supported switches into a single logical device with a single IP address." This defines VSF's purpose as virtualization of the switch chassis

not the network.

The Aruba CX 6300 Switch Series is specifically designed for enterprise campus access, aggregation, and core deployments. It features the Aruba Virtual Stacking Framework (VSF), which allows up to 10 switches to be stacked and managed as a single entity, providing high-density port connectivity. This series also offers a comprehensive Layer 3 feature set, including dynamic routing protocols like OSPF and BGP, as well as VRF-Lite, making it optimized for deployments requiring scalable, high-performance Layer 3 routing in a stacked configuration.

A. Aruba CX 6200: While the 6200 series supports VSF stacking, it is an entry-level access switch with more basic Layer 3 features, not optimized for high-density routing.

B. Aruba CX 4100i: This is a ruggedized switch series for IoT and harsh environments that supports only static routing and does not support VSF stacking.

D. Aruba CX 10000: This is a data center-specific Distributed Services Switch, not a campus switch, and it does not support VSF stacking.

1. Aruba CX 6300 Switch Series Datasheet: "The Aruba CX 6300 Switch Series is a modern

flexible

and intelligent family of stackable switches ideal for enterprise network access

aggregation

and core... High performance stacking with Aruba Virtual Stacking Framework (VSF) for stacking of up to 10 switches... Comprehensive Layer 2 and Layer 3 feature set includes BGP

OSPF

VRF

and IPv6." (Page 1

"Product overview" and "Product highlights" sections).

2. Aruba CX 6200 Switch Series Datasheet: "The Aruba CX 6200 Switch Series is a family of stackable access switches... Supports static routing and OSPF." (Page 1

"Product overview" and "Key features" sections). This highlights its role as an access switch with less comprehensive L3 features compared to the 6300.

3. Aruba CX 4100i Switch Series Datasheet: "The Aruba CX 4100i Switch Series is a family of ruggedized Ethernet switches... Convenient built-in wire-speed Layer 2 switching with static routing support." (Page 1

"Product overview" section). The datasheet confirms the lack of VSF stacking and advanced routing.

4. Aruba CX 10000 Series Switch with Pensando Datasheet: "The Aruba CX 10000 Series Switch with Pensando is a new category of data center switch..." (Page 1

"Product overview" section). This clearly positions it outside the campus switch category specified in the question.

On an Aruba CX switch, assigning a Layer 3 interface to a Virtual Routing and Forwarding (VRF) instance is a two-step process in the CLI. First, you enter the configuration context of the specific interface (e.g., interface 1/1/1). Second, within that context, you use the vrf attach command to associate the interface with the desired VRF. Option A, interface 1/1/1 vrf attach vrf1, accurately represents this required command sequence and syntax.

B. set vrf 1/1/1 vrf1: This is not a valid ArubaOS-CX command syntax for interface configuration or VRF assignment.

C. interface vrf assign 1/1/1 vrf1: The keywords vrf assign are incorrect. The correct command uses vrf attach within the interface context.

D. switchport vrf add vrf1: The switchport command is used for Layer 2 configurations. VRF assignment is a Layer 3 function, making this command contextually incorrect.

1. ArubaOS-CX 10.12 Virtual Routing and Forwarding (VRF) Guide

Page 12

Section: "Associating a layer 3 interface with a VRF". The guide explicitly shows the command vrf attach being used within the interface context (switch(config-if)#).

2. ArubaOS-CX 10.12 Command-Line Interface Guide

Page 7818. The entry for the vrf attach command specifies its function as "Attaches the current interface to a VRF" and confirms its usage within the config-if context.

The Aruba CX 6300 and Aruba CX 8400 switch series are designed for environments requiring high availability and resiliency. The Aruba CX 6300 series are stackable access switches that feature models with field-replaceable, hot-swappable power supplies, allowing for N+1 redundancy. The Aruba CX 8400 is a high-performance modular chassis switch designed for core and data center roles, which inherently includes multiple hot-swappable, load-sharing power supplies to ensure continuous operation and high levels of redundancy.

A. Aruba CX 6200: This series is an entry-level access switch family that features fixed, non-modular internal power supplies and is not designed for power supply redundancy.

D. Aruba CX 4100i: This is a ruggedized switch series designed for harsh environments. It features fixed, non-modular internal power supplies and does not support redundancy.

1. Aruba CX 6300 Switch Series Datasheet: Under the "High availability and resiliency" section

it states

"Hot-swappable

redundant power supplies and fans." (Hewlett Packard Enterprise

Document Number: a00097639enw

Page 3).

2. Aruba CX 8400 Switch Series Datasheet: In the "Key Features" summary

it lists "Redundant and hot-swappable power supplies and fans" as a core feature of this modular chassis. (Hewlett Packard Enterprise

Document Number: a00021842enw

Page 1).

3. Aruba CX 6200 Switch Series Datasheet: The "High availability and resiliency" section explicitly mentions

"Fixed power supply and fans

" confirming the lack of modularity and redundancy. (Hewlett Packard Enterprise

Document Number: a00094942enw

Page 3).

4. Aruba CX 4100i Switch Series Datasheet: The "High availability and resiliency" section states

"Fixed power supply and fans

" indicating no support for modular

redundant power supplies. (Hewlett Packard Enterprise

Document Number: a00112728enw

Page 3).

The show dhcp-relay command is the correct command used in the ArubaOS-CX command-line interface (CLI) to display the comprehensive status of the DHCP relay agent. This command provides information about the global DHCP relay configuration, including whether the feature is enabled, the VLANs or interfaces on which it is active, and the configured helper IP addresses. It is the primary command for verifying the operational state and configuration of the DHCP relay service across the entire device. The question uses a space (dhcp relay) which is functionally equivalent to the hyphenated form (dhcp-relay) found in the documentation.

A. show ip helper-address is not the correct command syntax in ArubaOS-CX to view the overall DHCP relay status; this syntax is more common in other vendor CLIs like Cisco IOS.

C. The display command is used in the HPE Comware CLI. The ArubaOS-CX CLI, relevant to the HPE7-A08 exam, uses the show command for displaying configuration and status.

D. show dhcp forwarding is not a valid command in ArubaOS-CX for displaying information about the DHCP relay agent. The correct term is "relay," not "forwarding."

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1. ArubaOS-CX 10.12 CLI Reference Guide

Page 1229. The guide documents the show dhcp-relay command. The description states: "Shows DHCP relay information." The command output example clearly displays the global status

enabled VLANs

and configured helper addresses

confirming it shows the status of all configurations.

2. ArubaOS-CX 10.10 Fundamentals Guide

Page 238. In the "Verifying DHCP relay" section

the guide explicitly states to use the show dhcp-relay command to verify the DHCP relay configuration. The sample output shows the "DHCP Relay Agent" status as "Enabled

" along with the list of "Enabled Vlans" and "Helper Addresses."

Live Upgrade is a specific feature in ArubaOS-CX designed to update the switch software with minimal service disruption. On systems with redundant management modules or in a Virtual Switching Framework (VSF) stack, Live Upgrade updates the standby member first. Once the standby is updated and ready, a graceful failover is initiated, making the newly updated member active. This process ensures the data plane continues to forward traffic throughout the upgrade, significantly reducing downtime compared to a standard reboot.

A. Virtual Switching Framework (VSF) is a stacking technology that virtualizes multiple switches into a single logical device. While it provides the high-availability foundation for a Live Upgrade, it is not the upgrade feature itself.

C. Multi-Chassis Link Aggregation (MC-LAG) is a high-availability feature that provides link and chassis redundancy for connected devices, but it is not a software update mechanism for the switches.

D. Zero Touch Provisioning (ZTP) is a deployment feature used to automate the initial configuration and software loading of a new switch, not for upgrading an already operational switch.

1. HPE Aruba Networking

ArubaOS-CX 10.12 High Availability Guide

Page 19

"Live upgrade" chapter: "The live upgrade feature provides the ability to upgrade the switch software with minimum downtime. This feature is supported on switches with redundant management modules and on VSF stacks."

2. HPE Aruba Networking

ArubaOS-CX 10.12 Fundamentals Guide

Page 101

"Zero Touch Provisioning (ZTP)" chapter: "Zero Touch Provisioning (ZTP) helps to provision the switch automatically with software images and configuration files from the network with little to no user intervention."

3. HPE Aruba Networking

ArubaOS-CX 10.12 Fundamentals Guide

Page 121

"Virtual Switching Framework (VSF)" chapter: "Virtual Switching Framework (VSF) is a virtualization technology that stacks up to 10 switches of the same family into one virtual device called a 'stack'."

The command clear mac-address-table dynamic is used in ArubaOS-CX to remove all dynamically learned MAC address entries from the forwarding database (MAC table). This action forces the switch to relearn the MAC addresses of connected devices as they transmit frames. This is a standard administrative procedure for troubleshooting Layer 2 connectivity issues or clearing stale entries after network topology changes. The dynamic keyword specifically targets entries learned through traffic observation, leaving any statically configured MAC addresses untouched.

B. The verb delete and the object name mac-table are not the correct syntax for this operation in the ArubaOS-CX command-line interface.

C. The verb flush is not used for clearing the MAC address table in ArubaOS-CX; the correct command verb is clear.

D. The correct object name is mac-address-table, not mac-table. This command is syntactically incorrect and would not be recognized by the switch.

1. ArubaOS-CX 10.12 Command-Line Interface Guide

Page 1

"clear mac-address-table" command section. The guide provides the full command syntax: clear mac-address-table [dynamic | ] [vlan ] [interface ]. The description for the dynamic parameter explicitly states it "Clears all dynamic MAC address entries."

2. ArubaOS-CX 10.10 Fundamentals Guide

Page 211

"Monitoring MAC addresses" section. The guide discusses viewing the MAC address table and mentions the clear mac-address-table command as the method for removing entries.