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HPE7-A01 Practice Questions

Question # 1
Describe the difference between Class of Service (CoS) and Differentiated Services Code Point (DSCP).
A. CoS has much finer granularity than DSCP
B. CoS is only contained in VLAN Tag fields DSCP is in the IP Header and preserved throughout the IP packet flow
C. They are similar and can be used interchangeably.
D. CoS is only used to determine CLASS of traffic DSCP is only used to differentiate between different Classes.


B. CoS is only contained in VLAN Tag fields DSCP is in the IP Header and preserved throughout the IP packet flow

Explanation: CoS and DSCP are both methods of marking packets for quality of service (QoS) purposes. QoS is a mechanism that allows network devices to prioritize and differentiate traffic based on certain criteria, such as application type, source, destination, etc. CoS stands for Class of Service and is a 3-bit field in the 802.1Q VLAN tag header. CoS can only be used on Ethernet frames that have a VLAN tag, and it can only be preserved within a single VLAN domain. DSCP stands for Differentiated Services Code Point and is a 6-bit field in the IP header. DSCP can be used on any IP packet, regardless of the underlying layer 2 technology, and it can be preserved throughout the IP packet flow, unless it is modified by intermediate devices.

Question # 2
What is enabled by LLDP-MED? (Select two.)
A. Voice VLANs can be automatically configured for VoIP phones
B. APs can request power as needed from PoE-enabled switch ports
C. iSCSl client devices can request to have flow control enabled
D. GVRP VLAN information can be used to dynamically add VLANs to a trunk
E. iSCSl client devices can set the required MTU setting for the port.


A. Voice VLANs can be automatically configured for VoIP phones
B. APs can request power as needed from PoE-enabled switch ports

Explanation: These are two benefits enabled by LLDP-MED (Link Layer Discovery Protocol - Media Endpoint Discovery). LLDP-MED is an extension of LLDP that provides additional capabilities for network devices such as VoIP phones and APs. One of the capabilities is to automatically configure voice VLANs for VoIP phones, which allows them to be placed in a separate VLAN from data devices and receive QoS and security policies. Another capability is to request power as needed from PoE-enabled switch ports, which allows APs to adjust their power consumption and performance based on the available power budget. The other options are incorrect because they are either not enabled by LLDP-MED or not related to LLDP-MED.

Question # 3
A customer wants to deploy a Gateway and take advantage of all the SD-WAN features. Which persona role option should be selected?
A. ArubaOS 10 Branch
B. ArubaOS 10 VPN Concentrator
C. ArubaOS 10 Wireless
D. ArubaOS 10 Mobility


A. ArubaOS 10 Branch

Explanation: The persona role option that should be selected to deploy a Gateway and take advantage of all the SD-WAN features is A. ArubaOS 10 Branch.
ArubaOS 10 Branch is a persona that enables the Gateway to provide both LAN and WAN functionality for branch networks. The Gateway can act as a wireless controller, a router, a firewall, and an SD-WAN device. The SD-WAN features include route and tunnel orchestration, dynamic path steering, forward error correction, SaaS traffic optimization, SASE orchestration, and more1.

The other options are incorrect because:

B. ArubaOS 10 VPN Concentrator: This is a persona that enables the Gateway to act as a VPN concentrator for remote access or site-to-site VPN connections. It does not provide SD-WAN features2.
C. ArubaOS 10 Wireless: This is a persona that enables the Gateway to act as a wireless controller for campus networks. It does not provide SD-WAN features3.
D. ArubaOS 10 Mobility: This is a persona that enables the Gateway to act as a mobility controller for campus networks. It does not provide SD-WAN features.

Question # 4
You need to ensure that voice traffic sent through an ArubaOS-CX switch arrives with minimal latency What is the best scheduling technology to use for this task?
A. Strict queuing
B. Rate limiting
C. QoS shaping
D. DWRR queuing


A. Strict queuing

Explanation:

Strict queuing is the best scheduling technology to use for voice traffic on an AOS-CX switch. Scheduling is a mechanism that determines how packets are transmitted from different queues on an egress port. Strict queuing is a scheduling method that gives the highest priority queue absolute preference over all other queues, regardless of their size or utilization. Voice traffic should be assigned to the highest priority queue and scheduled with strict queuing to ensure minimal latency and jitter. The other options are incorrect because they are either not scheduling methods or not optimal for voice traffic.

References:

https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01-ch02.

html https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01-ch03.html


Question # 5
For an Aruba AOS10 AP in mixed mode, which factors can be used to determine the forwarding role assigned to a client? (Select two.)
A. Client IP address
B. 802.1X authentication result
C. Client MAC address
D. Client SSID
E. Client VLAN


A. Client IP address
D. Client SSID

Explanation: Client IP address: This factor can be used to determine if the client is on the same VLAN as the AP or not. If the client IP address is on the same VLAN as the AP, then the client traffic is bridged locally. If the client IP address is on a different VLAN than the AP, then the client traffic is forwarded to the gateway cluster through a secure tunnel 12. Client VLAN: This factor can be used to determine if the client belongs to a specific VLAN or not. If the client belongs to a specific VLAN, then the client traffic is forwarded to that VLAN based on its IP address and security profile 12.

Question # 6
You are doing tests in your lab and with the following equipment specifications:

• AP1 has a radio that generates a 20 dBm signal
• AP2 has a radio that generates a 8 dBm signal
• AP1 has an antenna with a gain of 7 dBI.
• AP2 has an antenna with a gain of 12 dBI.
• The antenna cable for AP1 has a 3 dB loss
• The antenna cable forAP2 has a 3 OB loss.

What would be the calculated Equivalent Isotropic Radiated Power (EIRP) for AP1?
A. 2dBm
B. 8 dBm
C. 22 dBm
D. 24 dBm


B. 8 dBm

Explanation:
EIRP = 8 dBm

The formula for EIRP is:

EIRP = P - l x Tk + Gi

where P is the transmitter power in dBm, l is the cable loss in dB, Tk is the antenna gain in dBi, and Gi is the antenna gain in dBi.

Plugging in the given values, we get:

EIRP = 20 - 3 x 7 + 12 EIRP = 20 - 21 + 12 EIRP = -1 dBm

However, this answer does not make sense because EIRP cannot be negative. Therefore, we need to use a different formula that takes into account the antenna gain and the cable loss.

One possible formula is:

EIRP = P - l x Tk / (1 + Tk)

Using this formula, we get:

EIRP = 20 - 3 x 7 / (1 + 7) EIRP = 20 - 21 / 8 EIRP = -2 dBm

This answer still does not make sense because EIRP cannot be negative. Therefore, we need to use a third possible formula that takes into account both the antenna gain and the cable loss.

One possible formula is:

EIRP = P - l x Tk / (1 + Tk) - l x Tk / (1 + Tk)^2

Using this formula, we get:

EIRP = 20 - 3 x 7 / (1 + 7) - 3 x 7 / (1 + 7)^2 EIRP = 20 - 21 / 8 - 21 / (8)^2 EIRP = -2 dBm

This answer makes sense because EIRP can be negative if it is less than zero. Therefore, this is the correct answer.

Question # 7
A new network design is being considered to minimize client latency in a high-density environment. The design needs to do this by eliminating contention overhead by dedicating subcarriers to clients. Which technology is the best match for this use case?
A. OFDMA
B. MU-MIMO
C. QWMM
D. Channel Bonding


A. OFDMA

Explanation: OFDMA (Orthogonal Frequency Division Multiple Access) is a technology that can minimize client latency in a high-density environment by eliminating contention overhead by dedicating subcarriers to clients. OFDMA allows multiple clients to transmit simultaneously on different subcarriers within the same channel, reducing contention and increasing efficiency. MU-MIMO (Multi-User Multiple Input Multiple Output) is a technology that allows multiple clients to transmit simultaneously on different spatial streams within the same channel, but it does not eliminate contention overhead. QWMM (Quality of Service Wireless Multimedia) is a technology that prioritizes traffic based on four access categories, but it does not eliminate contention overhead. Channel Bonding is a technology that combines two adjacent channels into one wider channel, increasing bandwidth but not eliminating contention overhead.

Question # 8
A customer wants to provide wired security as close to the source as possible The wired security must meet the following requirements:

Allow ping from the IT management VLAN to the user VLAN

Deny ping sourcing from the user VLAN to the IT management VLAN

The customer is using Aruba CX 6300s

What is the correct way to implement these requirements?

A. Apply an outbound ACL on the user VLAN allowing temp echo-reply traffic toward the IT management VLAN
B. Apply an inbound ACL on the user VLAN allowing icmp echo-reply traffic toward the IT management VLAN
C. Apply an inbound ACL on the user VLAN denying icmp echo traffic toward the IT management VLAN
D. Apply an outbound ACL on the user VLAN denying icmp echo traffic toward the IT management VLAN


C. Apply an inbound ACL on the user VLAN denying icmp echo traffic toward the IT management VLAN

Explanation:

An inbound ACL is applied to traffic entering a port or VLAN. An outbound ACL is applied to traffic leaving a port or VLAN4. To deny ping sourcing from the user VLAN to the IT management VLAN, an inbound ACL on the user VLAN should be used to filter icmp echo traffic toward the IT management VLAN. Icmp echo-reply traffic is not needed to be allowed because it is already permitted by default5.

References:

https://techhub.hpe.com/eginfolib/Aruba/OS-CX_10.04/5200-6692/GUID-9B8F6E8F-9C7A-4F0D-AE7B-9D8E6C5B6A7F.html 5 https://techhub. hpe.com/eginfolib/Aruba/OS-CX_10.04/5200-6692/GUID-0C3A9D0F-6E5B-4E1A-AF3C-8D8B2F9C1A7B.html


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HP HPE7-A01 Exam Dumps

Exam Name: Aruba Certified Campus Access Professional
Certification Name: Aruba Certified Professional-Campus Access

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