Free HPE6-A85 Practice Test Questions and Answers (2026) | Cert Empire Practice Questions

The signal to noise ratio (SNR) is a measure that compares the level of a desired signal to the level of

background noise. SNR is defined as the ratio of signal power to the noise power, often expressed in

decibels (dB). A high SNR means that the signal is clear and easy to detect or interpret, while a low

SNR means that the signal is corrupted or obscured by noise and may be difficult to distinguish or

recover3. To calculate the SNR in dB, we can use the following formula:

SNR (dB) = Signal power (dBm) - Noise power (dBm)

In this question, we are given that the noise floor measures -90 dBm (0.000000001 milliwatts) and

the receiver’s signal strength is -65 dBm (0.000316 milliwatts). Therefore, we can plug these values

into the formula and get:

SNR (dB) = -65 dBm - (-90 dBm) SNR (dB) = -65 dBm + 90 dBm SNR (dB) = 25 dBm

Therefore, the correct answer is that the SNR is 25 dBm.

Reference: 3 https://en.wikipedia.org/wiki/Signal-to-noise_ratio

In a Virtual Switching Extension (VSX) stack, the Virtual IP (VIP) provides a single default gateway IP

address for clients connected to the access switch. This VIP is a floating IP that is active on the

primary VSX switch. In the event of a failure of the primary switch, the VIP will failover to the

secondary switch, ensuring that client traffic can continue to be routed without disruption.

The main characteristic of the 6 GHz band that is true among the given options is that in North

America, the 6 GHz band offers more 80 MHz channels than there are 40 MHz channels in the 5 GHz

band. This characteristic provides more spectrum availability, less interference, and higher

throughput for wireless devices that support Wi-Fi 6E Wi-Fi Enhanced (Wi-Fi 6E) is an extension of

Wi-Fi 6 (802.11ax) standard that operates in the newly available unlicensed frequency spectrum

around 6 GHz in addition to existing bands below it. Some facts about this characteristic are:

In North America, there are up to seven non-overlapping channels available in each of three channel

widths (20 MHz, 40 MHz, and 80 MHz) in the entire unlicensed portion of the new spectrum (5925–

7125 MHz). This means there are up to 21 non-overlapping channels available for Wi-Fi devices in

total.

In comparison, in North America, there are only nine non-overlapping channels available in each of

two channel widths (20 MHz and 40 MHz) in the entire unlicensed portion of the existing spectrum

below it (2400–2483 MHz and 5150–5825 MHz). This means there are only up to nine non-

overlapping channels available for Wi-Fi devices in total.

Therefore, in North America, there are more than twice as many non-overlapping channels available

in each channel width in the new spectrum than in the existing spectrum below it.

Specifically, there are more than twice as many non-overlapping channels available at 80 MHz width

(seven) than at 40 MHz width (three) in the existing spectrum below it.

The other options are not true because:

Less RF signal is absorbed by objects in a 6 GHz WLAN: This option is false because higher frequency

signals tend to be more absorbed by objects than lower frequency signals due to higher attenuation

Attenuation is a general term that refers to any reduction in signal strength during transmission over

distance or through an object or medium . Therefore, RF signals in a 6 GHz WLAN would be more

absorbed by objects than RF signals in a lower frequency WLAN.

The 6 GHz band is fully backward compatible with existing bands: This option is false because Wi-Fi

devices need to support Wi-Fi 6E standard to operate in the new spectrum around 6 GHz . Existing

Wi-Fi devices that do not support Wi-Fi 6E standard cannot use this spectrum and can only operate in

existing bands below it.

Low Power Devices are allowed for indoor and outdoor usage: This option is false because Low

Power Indoor Devices (LPI) are only allowed for indoor usage under certain power limits and

registration requirements . Outdoor usage of LPI devices is prohibited by regulatory authorities such

as FCC Federal Communications Commission (FCC) is an independent agency of United States

government that regulates communications by radio, television, wire, satellite, and cable across

United States . However, outdoor usage of Very Low Power Devices (VLP) may be allowed under

certain power limits and without registration requirements.

Reference: https://www.wi-fi.org/discover-wi-fi/wi-fi-certified-6e https://www.wi-fi.org/file/wi-fialliance-spectrum-needs-study

https://www.cisco.com/c/en/us/products/collateral/wireless/spectrum-expert-wifi/prod_white_paper0900aecd807395a9.html

https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/82068-powerlevels.html https://www.wi-fi.org/file/wi-fi-alliance-unlicensed-spectrum-in-the-us

The correct command to add a static route to a class-c-network 10.2.10.0 via a gateway of 172.16.1.1

is ip-route 10.2.10.0/24 172.16.1.1 . This command specifies the destination network address

(10.2.10.0) and prefix length (/24) and the next-hop address (172.16.1 .1) for reaching that network

from the switch. The other commands are either incorrect syntax or incorrect parameters for adding

a static route. Reference: https://www.arubanetworks.com/techdocs/AOSCX_10_04/NOSCG/Content/cx-noscg/ip-routing/static-routes.htm

To add a static route in network devices, including Aruba switches, the correct command format

generally includes the destination network, subnet mask (or CIDR notation for the mask), and the

next-hop IP address. The command "ip route 10.2.10.0/24 172.16.1.1" correctly specifies the

destination network "10.2.10.0" with a class C subnet mask indicated by "/24", and "172.16.1.1" as

the next-hop IP address. This command is succinct and follows the standard syntax for adding a static

route in many network operating systems, including ArubaOS-CX. The other options either have

incorrect syntax or include additional unnecessary parameters that are not typically part of the

standard command to add a static route.

AirMatch is a feature that provides centralized RF planning and optimization service for Aruba

wireless networks. It uses cloud-based algorithms and machine learning to optimize the RF

performance and user experience. Reference:

https://www.arubanetworks.com/assets/ds/DS_AirMatch.pdf

In Aruba networks, the recommended Virtual Switching Framework (VSF) topologies include the

daisy chain plus Multi-Active Detection (MAD) and the ring topology. The daisy chain topology with

MAD provides a straightforward and effective way to connect multiple switches in a series while

ensuring there is a mechanism in place (MAD) to detect and handle situations where more than one

switch in the VSF might become active simultaneously. The ring topology offers redundancy by

creating a looped connection pattern among the VSF members, enhancing network resilience and

reliability.

The command that is used to set a default route to 10.4.5.1 on an Aruba CX switch when in-band

management using an SVI is being used is ip route 0.0 0 0/0 10.4.5.1 . This command specifies the

destination network address (0.0 0 0) and prefix length (/0) and the next-hop address (10.4.5.1) for

reaching any network that is not directly connected to the switch. The default route applies to the

default VRF Virtual Routing and Forwarding. VRF is a technology that allows multiple instances of a

routing table to co-exist within the same router at the same time. VRFs are typically used to segment

network traffic for security, privacy, or administrative purposes. , which is used for in-band

management traffic that goes through an SVI Switch Virtual Interface. SVI is a virtual interface on a

switch that allows the switch to route packets between different VLANs on the same switch or

different switches that are connected by a trunk link. An SVI is associated with a VLAN and has an IP

address and subnet mask assigned to it12.

Reference: 1 https://www.arubanetworks.com/techdocs/AOS-CX/10_08/HTML/ip_route_4100i6000-6100-6200/Content/Chp_StatRoute/def-

rou.htm 2 https://www.arubanetworks.com/techdocs/AOS-CX/10_08/HTML/ip_route_4100i-60006100-6200/Content/Chp_VRF/vrf-overview.htm

This configuration script will achieve the task as it follows the guidelines given by the Senior

Engineer. It creates VLAN 20 with name Mgmt, adds L3 SVI on VLAN 20 with IP address 10.1.1.10/24,

creates LAG 1 with LACP mode active for the uplink, uses VLAN 20 as the native VLAN on the LAG,

and ensures that the interfaces are all ON. Reference:

https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6790/GUID-8F0E7E8B-0F4B4A3C-AE7F-0F1B5A7F9C5D.html

Edge1# conf t

vlan 20

name Mgmt

interface vlan 20

ip address 10.1.1.10/24

no shut

interface lag 1

no shut

vlan trunk native 20

vlan trunk allowed all

lacp mode active

interface 1/1/51

no shut

lag 1

interface 1/1/52

no shut

lag 1

exit

This script correctly creates VLAN 20 with the name 'Mgmt', adds an L3 SVI for management using

the specified IP address, and configures LACP for link aggregation (LAG 1) using the active mode. It

also sets VLAN 20 as the native VLAN on the LAG and ensures all interfaces are enabled ('no shut' is

the command to bring up the interface if it has been administratively shut down).

The Alerts and Events dashboard displays all types of alerts and events generated for events

pertaining to device provisioning, configuration, and user management. You can use the Config icon

to configure alerts and notifications for different alert categories and severities1. You can also view

the alerts and events in the List view and Summary view2.

Reference: 1 https://www.arubanetworks.com/techdocs/central/latest/content/nms/alerts/configuri

ng-

alerts.htm 2 https://www.arubanetworks.com/techdocs/central/latest/content/nms/alerts/viewingalerts.htm

A UXI (User Experience Insight) is a device that simulates user behavior and tests network

performance from the user perspective. It can check different applications, such as HTTP, VOIP, or

Office 365, and measure metrics such as latency, jitter, packet loss, and throughput. Reference:

https://www.arubanetworks.com/products/networking/user-experience-insight/

A User Experience Insight (UXI) sensor, such as those used in Aruba networks, is designed to mimic

client behavior and test the performance of various network services and applications from the

user's perspective. It can simulate user activities and measure the quality of experience for different

applications, including HTTP, VOIP, and cloud services like Office 365, providing valuable insights into

network performance and user experience.

WPA3-Personal enhances the security of wireless networks by using Simultaneous Authentication of

Equals (SAE), which is a more secure replacement for the Pre-Shared Key (PSK) method used in

WPA2. SAE strengthens the initial key exchange, providing better protection against offline dictionary

attacks and ensuring that each session has a unique Pairwise Master Key (PMK), derived from the

interaction between the client and the access point, including session-specific information like MAC

addresses and nonces.

Wireless client roaming decisions are made by the client device based on its own criteria, such as

signal strength, noise level, data rate, etc. The network can influence the client’s roaming decision by

providing information such as neighbor reports, load balancing, band steering, etc., but the final

decision is up to the client. Reference:

https://www.arubanetworks.com/techdocs/Instant_86_WebHelp/Content/instant-ug/wlanroaming/client-roaming.htm

Wireless client roaming decisions are primarily made by the client device itself. The client device

monitors the signal strength and quality of the current connection and decides to roam to a different

Access Point (AP) when the current signal deteriorates below a certain threshold or a better option is

available. While APs and controllers can provide information and support for roaming decisions

through protocols like 802.11k and 802.11v, the ultimate decision to roam is made by the client

device based on its algorithms and thresholds.

Bonding multiple 20MHz wide 802.11 channels is a technique to create a wider bandwidth channel

that supports higher data rate transmissions. It can increase the throughput between the client and

AP by using more spectrum resources and reducing interference. Reference:

https://ieeexplore.ieee.org/document/9288995

Bonding multiple 20MHz wide 802.11 channels is a technique used to increase the throughput

between the client device and the Access Point (AP). By combining two or more 20MHz channels into

a wider channel (e.g., 40MHz, 80MHz, or even 160MHz), the data carrying capacity and,

consequently, the overall throughput of the wireless connection are increased. This method is

particularly useful in high-bandwidth applications or environments where higher data rates are

required.

Aruba’s Captive Portal uses Layer 3 authentication, which means that it intercepts the client’s HTTP

requests and redirects them to a web page where the client can enter their credentials. The

credentials are then verified by a RADIUS server or a local database before granting network access.

Reference: https://www.arubanetworks.com/techdocs/Instant_86_WebHelp/Content/instantug/captive-portal/captive-portal-auth.htm

Aruba's Captive Portal primarily uses Layer 3 authentication, which operates at the network layer.

When a user connects to a network with a Captive Portal, they are redirected to a web page for

authentication. This process involves the user entering credentials or accepting terms and conditions

through a web interface before gaining full access to the network. The Captive Portal intercepts the

user's web traffic at Layer 3, requiring them to authenticate before proceeding, which is why it's

considered a form of Layer 3 authentication.

USE CASE: a) Controls the dynamic addition and removal of ports to groups Technology: 3) LACP USE CASE: b) Tags Ethernet frames with an additional VLAN header Technology: 1) 802.1Q USE CASE: c) Used to authenticate EAP-Capable client on a switch port Technology: 2) 802.1X USE CASE: d) Used to identify a voice VLAN to an IP phone Technology: 4) LLDP The following table summarizes the switching technologies and their use cases: Technology Use case 802.1Q is a standard that defines how to create and manage virtual LANs (VLANs) on a network. VLANs allow network administrators to logically segment a network into different broadcast domains, improving security, performance, and manageability. 802.1Q tags Ethernet frames with an additional VLAN header th contains a VLAN identifier (VID), which indicates which VLAN the frame belongs to1. 1) 802.1Q 802.1X is a standard that defines how to provide port-based network access control (PNAC) on a network. PNAC allows network administrators to authenticate and authorize devices before granting them access to network resources. 802.1X uses the Extensible Authentication Protocol (EAP) to exchange authentication messages between a supplicant (a device that wants to access the network), an authenticator (a device tha controls access to the network, such as a switch), and an authentication server (a device that verifies the credentials of the supplicant, such as a RADIUS server)2. 2) 802.1X LACP stands for Link Aggregation Control Protocol, which is part of the IEEE 802.3ad standard that defines how to bundle multiple physical links into a single logical link, also known as a link aggregation group (LAG or an EtherChannel. LAGs provide increased bandwidth, load balancing, and redundancy for network connections. LACP controls the dynamic addition and removal of ports to groups, ensuring that only ports with compatible configurations can form a LAG3. 3) LACP LLDP stands for Link Layer Discovery Protocol, which is part of the IEEE 802.1AB standard that defines how discover and advertise information about neighboring devices on a network. LLDP operates at Layer 2 of th OSI model and uses TLVs (type-length-value) to exchange information such as device name, port number, VLAN ID, capabilities, and power requirements. LLDP can be used to identify a voice VLAN to an IP phone b sending a TLV that contains the voice VLAN ID and priority. 4) LLDP Reference: 1 https://en.wikipedia.org/wiki/IEEE_802.1Q 2 https://en.wikipedia.org/wiki/IEEE_802.1 X 3 https://en.wikipedia.org/wiki/Link_aggregation https://en.wikipedia.org/wiki/Link_Layer_Discovery_Protocol

Proves knowledge of the PMK Exchanges messages for generating PTK Distributes an encrypted GTK to the client Sets first initialization vector (IV)

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Features: 1) Clustered Instant Access Points Aruba OS version: a) Aruba OS 8 Features: 2) Dynamic Radius Proxy Aruba OS version: a) Aruba OS 8 Features: 3) Scales to more than 10,000 devices Aruba OS version: b) Aruba OS 10 Features: 4) Unifies wired and wireless management Aruba OS version: a) Aruba OS 8 Features: 5) Wireless controllers Aruba OS version: a) Aruba OS 8 ArubaOS is the operating system for all Aruba Mobility Controllers (MCs) and controller-managed wireless access points (APs). ArubaOS 8 delivers unified wired and wireless access, seamless roaming, enterprise grade security, and a highly available network with the required reliability to support high density environments1. Some of the features of ArubaOS 8 are: Clustered Instant Access Points: This feature allows multiple Instant APs to form a cluster and share configuration and state information. This enables seamless roaming, load balancing, and fast failover for clients2. Dynamic Radius Proxy: This feature allows an MC to act as a proxy for RADIUS authentication requests from clients or APs. This simplifies the configuration and management of RADIUS servers and reduces the network traffic between MCs and RADIUS servers3. Wireless controllers: Aruba wireless controllers are devices that centrally manage and control the wireless network. They provide functions such as AP provisioning, configuration, security, policy enforcement, and network optimization. ArubaOS 10 is the next-generation operating system that works with Aruba Central, a cloud-based network management platform. ArubaOS 10 delivers greater scalability, security, and AI-powered optimization across large campuses, branches, and remote work environments. Some of the features of ArubaOS 10 are: Scales to more than 10,000 devices: ArubaOS 10 can support up to 10,000 devices per cluster, which is ten times more than ArubaOS 8. This enables customers to scale their networks without compromising performance or reliability. Unifies wired and wireless management: ArubaOS 10 provides a single platform for managing both wired and wireless devices across the network. Customers can use Aruba Central to configure, monitor, troubleshoot, and update their devices from anywhere. Both ArubaOS 8 and ArubaOS 10 share some common features, such as: Unifies wired and wireless management: Both operating systems provide unified wired and wireless access for customers who use Aruba switches and APs. Customers can use a single interface to manage their entire network infrastructure1 . Reference: 1 https://www.arubanetworks.com/resource/arubaos-8-fundamentalguide/ 2 https://www.arubanetworks.com/techdocs/Instant_86_WebHelp/Content/instant-ug/iap- maintenance/cluster.htm 3 https://www.arubanetworks.com/techdocs/ArubaOS_86_Web_Help/Con tent/arubaos-solutions/1-overview/dynamic-radius-proxy.htm https://www.arubanetworks.com/products/networking/controllers/ https://www.arubanetworks.com/products/network-management-operations/arubaos/ https://blogs.arubanetworks.com/solutions/making-the-switch/ https://www.arubanetworks.com/products/network-management-operations/aruba-central/

Layer: 1) Physical layer Phase of Message Processing: d) Organize the data into bits Layer: 2) Data Link layer Phase of Message Processing: c) Organize the data into frames Layer: 3) Network layer Phase of Message Processing: b) Organize the data into packets Layer: 4) Transport layer Phase of Message Processing: a) Organize the data into segments The OSI model divides the networking process into seven layers, each representing a different step of the transmission chain. Each layer has its own function and is responsible for well-defined tasks. User data passes sequentially from the highest layer down through the lower layers until the device transmits it externally. The lowest layer, the physical layer, converts the data into bits that can be sent over a physical medium. The second layer, the data link layer, organizes the bits into frames that can be transmitted over a link between two nodes. The third layer, the network layer, organizes the frames into packets that can be routed across a network of nodes. The fourth layer, the transport layer, organizes the packets into segments that can provide reliable and error-free communication between two end points12. Reference: 1 https://www.linode.com/docs/guides/introduction-to-osinetworking-model/ 2 https://en.wikipedia.org/wiki/OSI_model

QoS Quality of Service (QoS) is a set of techniques that manage network resources and provide different levels of service to different types of traffic based on their requirements. QoS can improve network performance, reduce latency, increase throughput, and prevent congestion. concept and its definition. QoS Concept: Best Effort Service Class of Service Differentiated Services WMM ====================== Definition: d) A method where traffic is treated equally in a first-come, first-served manner a) A method for classifying network traffic at Layer 2 by marking 802.1Q VLAN Ethernet frames with one of eight service classes b) A method for classifying network traffic at Layer 3 by marking packets with one of 64 different service classes c) A method for classifying network traffic using access categories based on the IEEE 802.11e QoS standard Short But Comprehensive Explanation of Correct Answer Only: The correct match between QoS concept and its definition is as follows: Best Effort Service: This is a method where traffic is treated equally in a first-come, first-served manner without any prioritization or differentiation. This is the default service level for most networks and applications that do not have specific QoS requirements or guarantees. Best Effort Service does not provide any assurance of bandwidth, delay, jitter, or packet loss. Class of Service: This is a method for classifying network traffic at Layer 2 by marking 802.1Q VLAN Ethernet frames with one of eight service classes (0 to 7). These service classes are also known as IEEE 802.1p priority values or PCP Priority Code Point (PCP) is a 3-bit field in the 802.1Q VLAN tag that indicates the priority level of an Ethernet frame . Class of Service allows network devices to identify and handle different types of traffic based on their priority levels. Class of Service is typically used in LAN Local Area Network (LAN) is a network that connects devices within a limited geographic area, such as a home, office, or building environments where Layer 2 switching is predominant. Differentiated Services: This is a method for classifying network traffic at Layer 3 by marking packets with one of 64 different service classes (0 to 63). These service classes are also known as DiffServ Code Points (DSCP) DiffServ Code Point (DSCP) is a 6-bit field in the IP header that indicates the service class of a packet . Differentiated Services allows network devices to identify and handle different types of traffic based on their service classes. Differentiated Services is typically used in WAN Wide Area Network (WAN) is a network that connects devices across a large geographic area, such as a country or continent environments where Layer 3 routing is predominant. WMM: This is a method for classifying network traffic using access categories based on the IEEE 802.11e QoS standard. WMM stands for Wi-Fi Multimedia and it is a certification program developed by the Wi-Fi Alliance to enhance QoS for wireless networks. WMM defines four access categories (AC): Voice, Video, Best Effort, and Background. These access categories correspond to different priority levels and contention parameters for wireless traffic. WMM allows wireless devices to identify and handle different types of traffic based on their access categories. Reference: https://en.wikipedia.org/wiki/Quality_of_service https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_dfsrv/configuration/xe-16/qos-dfsrv-xe16-book/qos-dfsrv-overview.html https://www.cisco.com/c/en/us/support/docs/quality-of-service- qos/qos-packet-marking/10103-dscpvalues.html https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/81831-qoswlan.html https://www.wi-fi.org/discover-wi-fi/wi-fi-certified-wmm