HP HP Certifications HPE7-A01 Questions & Answers

• Question 81:

  You are setting up a customer's 15 headless loT devices that do not support 802.1X. What should you use?

  A. Multiple Pre-Shared Keys (MPSK) Local

  B. Clearpass with WPA3-PSK

  C. Clearpass with WPA3-AES

  D. Multiple Pre-Shared Keys (MPSK) with WPA3-AES

  Correct Answer: A

  Explanation: MPSK Local is a feature that can be used to set up 15 headless IoT devices that do not support 802.1X authentication. MPSK Local allows the switch to automatically generate and assign unique pre-shared keys for devices based on their MAC addresses, without requiring any configuration on the devices or an external authentication server. The other options are incorrect because they either require 802.1X authentication, which is not supported by the IoT devices, or WPA3 encryption, which is not supported by Aruba CX switches. References: https://www.arubanetworks.com/techdocs/AOS- CX/10.04/HTML/5200-6728/bk01-ch05.html https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01- ch06.html

• Question 82:

  You are troubleshooting an issue with a pair of Aruba CX 8360 switches configured with VSX Each switch has multiple VRFs. You need to find the IP address of a particular client device with a known MAC address You run the "show arp" command on the primary switch in the pair but do not find a matching entry for the client MAC address.

  The client device is connected to an Aruba CX 6100 switch by VSX LAG.

  Which action can be used to find the IP address successfully?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: B

  Explanation: The show arp command displays the ARP table for a specific VRF or all VRFs on the switch. The ARP table contains the IP address to MAC address mappings for hosts that are directly connected to the switch or reachable through a gateway. If the client device is connected to another switch by VSX LAG, the ARP entry for the client device will not be present on the primary switch unless it has communicated with it recently. Therefore, to find the IP address of the client device, the administrator should run the show arp command on the secondary switch in the VSX pair, specifying the VRF name that contains the client device's subnet. References: https://techhub.hpe.com/eginfolib/Aruba/OS-CX_10.04/5200-6692/GUID-9B8F6E8F-9C7A- 4F0D-AE7B-9D8E6C5B6A7F.html

• Question 83:

  Your customer has asked you to assign a switch management role for a new user The customer requires the user role to only have Web Ul access to the System > Log page and only have access to the GET method for REST API for the / logs/event resource

  Which default AOS-CX user role meets these requirements?

  A. administrators

  B. auditors

  C. sysops

  D. operators

  Correct Answer: A

  Explanation: The auditors role is the default AOS-CX user role that meets the requirements of having Web UI access to the System > Log page and having access to the GET method for REST API for the /logs/event resource. The auditors role has a level of 1 and allows read-only access to most commands except those related to security or passwords. It also allows access to the Web UI and REST API with limited permissions. The other options are incorrect because they either have higher levels of access or do not allow access to the Web UI or REST API. References: https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01- ch01.html https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200- 6728/bk01-ch04.html

• Question 84:

  Two AOS-CX switches are configured with VSX at the the Access-Aggregation layer where servers attach to them An SVI interface is configured for VLAN 10 and serves as the default gateway for VLAN 10. The ISL link between the switches fails, but the keepalive interface functions. Active gateway has been configured on the VSX switches.

  

  What is correct about access from the servers to the Core? (Select two.)

  A. Server 1 can access the core layer via the keepalrve link

  B. Server 2 can access the core layer via the keepalive link

  C. Server 2 cannot access the core layer.

  D. Server 1 can access the core layer via both uplinks

  E. Server 1 and Server 2 can communicate with each other via the core layer

  F. Server 1 can access the core layer on only one uplink

  Correct Answer: DE

  Explanation: These are the correct statements about access from the servers to the Core when the ISL link between the switches fails, but the keepalive interface functions. Server 1 can access the core layer via both uplinks because it is connected to VSX-A, which is still active for VLAN 10. Server 2 can also access the core layer via its uplink to VSX-B, which is still active for VLAN 10 because of Active Gateway feature. Server 1 and Server 2 can communicate with each other via the core layer because they are in the same VLAN and subnet, and their traffic can be routed through the core switches. The other statements are incorrect because they either describe scenarios that are not possible or not relevant to the question. References: https://www.arubanetworks.com/techdocs/AOS- CX/10.04/HTML/5200-6728/bk01

• Question 85:

  You are deploying a bonded 40 MHz wide channel.

  What is the difference in the noise floor perceived by a client using this bonded channel as compared to an unbonded 20MHz wide channel?

  A. 2dB

  B. 3dB

  C. 8dB

  D. 4dB

  Correct Answer: B

  Explanation: The difference in the noise floor perceived by a client using a bonded 40 MHz wide channel as compared to an unbonded 20 MHz wide channel is 3 dB. The noise floor is the level of background noise in a given frequency band. When two adjacent channels are bonded, the noise floor increases by 3 dB because the bandwidth is doubled and more noise is captured. The other options are incorrect because they do not reflect the correct relationship between bandwidth and noise floor. References: https://www.arubanetworks.com/techdocs/ArubaOS_86_Web_Help/Content/arubaos- solutions/wlan-rf/rf-fundamentals.htm https://www.arubanetworks.com/techdocs/ArubaOS_86_Web_Help/Content/arubaos- solutions/wlan-rf/channel-bonding.htm

• Question 86:

  Which method is used to onboard a new UXI in an existing environment with 802 1X authentication? (The sensor has no cellular connection)

  A. Use the UXI app on your smartphone and connect the UXI via Bluetooth

  B. Use the Aruba installer app on your smartphone to scan the barcode

  C. Connect the new UXI from an already installed one and adjust the initial configuration.

  D. Use the CLI via the serial cable and adjust the initial configuration.

  Correct Answer: A

  Explanation: To onboard a new UXI in an existing environment with 802.1X authentication, you need to use the UXI app on your smartphone and connect the UXI via Bluetooth. The UXI app allows you to scan the QR code on the UXI sensor

  and configure its network settings, such as SSID, password, IP address, etc. The Bluetooth connection allows you to communicate with the UXI sensor without requiring any network access or cellular connection. The other options are

  incorrect because they either do not use the UXI app or do not use Bluetooth.

  References:

  https://www.arubanetworks.com/products/network-management-operations/analytics- monitoring/user-experience-insight-sensors/

  https://help.centralon- prem.arubanetworks.com/2.5.4/documentation/online_help/content/nms-on-prem/aos- cx/get-started/uxi-sensor.htm

• Question 87:

  Which feature supported by SNMPv3 provides an advantage over SNMPv2c?

  A. Transport mapping

  B. Community strings

  C. GetBulk

  D. Encryption

  Correct Answer: D

  Explanation: Encryption is a feature supported by SNMPv3 that provides an advantage over SNMPv2c. Encryption protects the confidentiality and integrity of SNMP messages by encrypting them with a secret key. SNMPv2c does not support encryption and relies on community strings for authentication and authorization, which are transmitted in clear text and can be easily intercepted or spoofed. Transport mapping, community strings, and GetBulk are features that are common to both SNMPv2c and SNMPv3. References: https://www.arubanetworks.com/techdocs/ArubaOS_86_Web_Help/Content/arubaos- solutions/snmp/snmp.htm

  https://www.arubanetworks.com/techdocs/ArubaOS_86_Web_Help/Content/arubaos- solutions/snmp/snmpv3.htm

• Question 88:

  You need to create a keepalive network between two Aruba CX 8325 switches for VSX configuration How should you establish the keepalive connection?

  A. SVI, VLAN trunk allowed all on ISL in default VRF

  B. routed port in custom VRF

  C. loopback 0 and OSPF area 0 in default VRF

  D. SVI, VLAN trunk allowed all on ISL in custom VRF

  Correct Answer: B

  Explanation: To establish a keepalive connection between two Aruba CX 8325 switches for VSX configuration, you need to use a routed port in custom VRF. A routed port is a physical port that acts as a layer 3 interface and does not belong to any VLAN. A custom VRF is a virtual routing and forwarding instance that provides logical separation of routing tables. By using a routed port in custom VRF, you can isolate the keepalive traffic from other traffic and prevent routing loops or conflicts. The other options are incorrect because they either do not use a routed port or do not use a custom VRF. References: https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6728/bk01- ch07.html https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200- 6728/bk01-ch02.html

• Question 89:

  With the Aruba CX switch configuration, what is the Active Gateway feature that is used for and is unique to VSX configuration?

  A. Sixteen different VMACs are supported total as shared.

  B. Active Gateway can once MSTP instances are created for VLAN load sharing.

  C. Sixteen different VMACS are supported for each IPV4 and IPV6 stack simultaneously

  D. copied over the ISL link for an optimized path.

  Correct Answer: C

  Explanation: The active gateway feature is used to provide active-active layer 3 default gateway for hosts on the same subnet. It allows the switch to convert multicast streams into unicast streams over the wireless link, which improves the

  quality and reliability of streaming video, while preserving the bandwidth available to the non-video clients. The active gateway feature is unique to VSX configuration because it eliminates the need for VRRP and avoids traffic being pushed

  over the ISL link, which can cause latency in the network12.

  The correct answer to the question is C. Sixteen different VMACs are supported for each IPv4 and IPv6 stack simultaneously. This means that you can have a maximum of eight VMACs for IPv4, and a maximum of eight VMACs for IPv6, on a

  VSX pair. Only 15 VMACs are supported on 6400 switch series2.

  The other options are incorrect because:

  A. Sixteen different VMACs are not supported total as shared. They are supported for each IPv4 and IPv6 stack separately.

  B. Active gateway can be used without MSTP instances. MSTP is a protocol that allows multiple spanning tree instances to coexist on the same switch, but it does not affect how active gateway works.

  D. Active gateway does not copy traffic over the ISL link for an optimized path. It avoids using the ISL link for routed traffic and uses the local switch interface MAC instead of the virtual MAC address (VMAC) for source address1.

• Question 90:

  your customer has asked you to assign a switch management role for a new user The customer requires the user role to View switch configuration information and have access to the PUT and POST meth0ds for REST API.

  Which default AOS-CX user role meets these requirements?

  A. administrators

  B. auditors

  C. sysops

  D. helpdesk

  Correct Answer: C

  The correct answer is C. sysops.

  The sysops user role is a predefined role that allows users to view switch configuration information and have access to the PUT and POST methods for REST API. The sysops user role can also use the PATCH and DELETE methods for

  REST API, but not for all resources. The sysops user role is suitable for users who need to perform system operations on the switch, such as backup, restore, upgrade, or reboot. According to the AOS-CX REST API Reference basics1, one

  of the predefined user roles

  is:

  sysops: Users with this role can view switch configuration information and have access to the PUT and POST methods for REST API. They can also use the PATCH and DELETE methods for REST API, but not for all resources. Users with

  this role can perform system operations on the switch, such as backup, restore, upgrade, or reboot.

  The other options are incorrect because:

  A. administrators: Users with this role have full access to all switch configuration information and all REST API methods. This role is more than what the customer requires.

  B. auditors: Users with this role can only view switch configuration information and have access to the GET method for REST API. They cannot use the PUT and POST methods for REST API.

  D. helpdesk: Users with this role can view switch configuration information and have access to the GET method for REST API. They can also use the PATCH method for REST API, but only for a limited set of resources. They cannot use the PUT and POST methods for REST API.