HP HP Certifications HPE6-A84 Questions & Answers

• Question 31:

  When would you implement BPDU protection on an AOS-CX switch port versus BPDU filtering?

  A. Use BPDU protection on edge ports to protect against rogue devices when the switch implements MSTP; use BPDU filtering to protect against rogue devices when the switch implements PVSTP+.

  B. Use BPDU protection on edge ports to prevent rogue devices from connecting; use BPDU filtering on inter-switch ports for specialized use cases.

  C. Use BPDU protection on inter-switch ports to ensure that they are selected as root; use BPDU filtering on edge ports to prevent rogue devices from connecting.

  D. Use BPDU protection on edge ports to permanently lock out rogue devices; use BPDU filtering on edge ports to temporarily lock out rogue devices.

  Correct Answer: B

  BPDU (Bridge Protocol Data Unit) is a message that is exchanged between switches to maintain the spanning tree topology and prevent loops. BPDU protection and BPDU filtering are two features that can be configured on AOS-CX switch ports to enhance security and performance. BPDU protection is a feature that disables a port if it receives a BPDU, indicating that an unauthorized switch or device has been connected to the port. BPDU protection is typically used on edge ports, which are ports that connect to end devices such as PCs or printers, and are not expected to receive BPDUs. BPDU protection prevents rogue devices from connecting to the network and affecting the spanning tree topology. BPDU filtering is a feature that prevents a port from sending or receiving BPDUs, effectively isolating the port from the spanning tree topology. BPDU filtering is typically used on inter-switch ports, which are ports that connect to other switches, for specialized use cases such as creating a separate spanning tree domain or reducing the overhead of BPDUs. BPDU filtering should be used with caution, as it can create loops or inconsistencies in the network. You can find more information about how to configure BPDU protection and BPDU filtering on AOS-CX switch ports in the [Configuring Spanning Tree Protocol - Aruba] page and the [AOS-CX Switching Configuration Guide] page. The other options are not correct because they either use BPDU protection or BPDU filtering on the wrong type of ports or for the wrong purpose. For example, using BPDU protection on inter-switch ports would disable the ports if they receive BPDUs, which are expected in normal operation. Using BPDU filtering on edge ports would allow rogue devices to connect to the network and create loops or affect the spanning tree topology.

• Question 32:

  You are setting up Aruba ClearPass Policy Manager (CPPM) to enforce EAP-TLS authentication with Active Directory as the authentication source. The company wants to prevent users with disabled accounts from connecting even if those users still have valid certificates.

  As the first part of meeting these criteria, what should you do to enable CPPM to determine where accounts are enabled in AD or not?

  A. Add an Endpoint Context Server to the domain controller with actions for querying the domain controller for account status.

  B. Enable OCSP in the EAP-TLS authentication method settings and configure an OCSP override to the domain controller FQDN.

  C. Add a custom attribute for userAccountControl to the filters in the AD authentication source.

  D. Install a Microsoft Active Directory extension in Aruba ClearPass Guest and set up an HTTP authentication source that points to that extension.

  Correct Answer: C

  According to the ClearPass Policy Manager User Guide1, userAccountControl is a custom attribute in Active Directory that contains a set of flags that define the properties and behavior of user accounts. One of these flags is ACCOUNTDISABLE, which indicates whether the account is disabled or not. By adding this attribute to the filters in the AD authentication source, CPPM can retrieve this attribute for each user and use it as a condition in the enforcement policies to prevent users with disabled accounts from connecting even if they have valid certificates. Therefore, option C is the correct answer.

• Question 33:

  Refer to the scenario.

  A customer requires these rights for clients in the "medical-mobile" AOS firewall role on Aruba Mobility Controllers (MCs):

  1.

  Permitted to receive IP addresses with DHCP

  2.

  Permitted access to DNS services from 10.8.9.7 and no other server

  3.

  Permitted access to all subnets in the 10.1.0.0/16 range except denied access to 10.1.12.0/22

  4.

  Denied access to other 10.0.0.0/8 subnets

  5.

  Permitted access to the Internet

  6.

  Denied access to the WLAN for a period of time if they send any SSH traffic

  7.

  Denied access to the WLAN for a period of time if they send any Telnet traffic

  8.

  Denied access to all high-risk websites

  External devices should not be permitted to initiate sessions with "medical-mobile" clients, only send return traffic.

  The line below shows the effective configuration for the role.

  

  There are multiple issues with this configuration. What is one change you must make to meet the scenario requirements? (In the options, rules in a policy are referenced from top to bottom. For example, "medical-mobile" rule 1 is "ipv4 any any svc-dhcp permit," and rule 6 is "ipv4 any any any permit'.)

  A. Apply the "apprf-medical-mobile-sjcT policy explicitly to the 'medical-mobile' user-role under the 'medical-mobile" policy.

  B. In the "medical-mobile" policy, change the action for rules 2 and 3 to reject.

  C. In the "medical-mobile" policy, move rule 5 under rule 6.

  D. In the "medical-mobile* policy, change the subnet mask in rule 5 to 255.255.252.0.

  Correct Answer: D

  The scenario requires that the clients in the "medical-mobile" role are denied access to the 10.1.12.0/22 subnet, which is a range of IP addresses from 10.1.12.0 to 10.1.15.255. However, the current configuration in rule 5 has a subnet mask of 255.255.240.0, which means that it matches any IP address from 10.1.0.0 to 10.1.15.255. This is too broad and would deny access to other subnets in the 10.1.0.0/16 range that should be permitted according to the scenario. Therefore, the subnet mask in rule 5 should be changed to 255.255.252.0, which would match only the IP addresses from 10.1.12.0 to 10.1.15.255 and deny access to them as required by the scenario

• Question 34:

  You are working with a developer to design a custom NAE script for a customer. You are helping the developer find the correct REST API resource to monitor.

  Refer to the exhibit below.

  

  What should you do before proceeding?

  A. Go to the v1 API documentation interface instead of the v10.10 interface.

  B. Use your Aruba passport account and collect a token to use when trying out API calls.

  C. Enable the switch to listen to REST API calls on the default VRF.

  D. Make sure that your browser is set up to store authentication tokens and cookies.

  Correct Answer: B

  The exhibit shows the ArubaOS-CX REST API documentation interface, which allows you to explore the available resources and try out the API calls using the "Try it out" button. However, before you can use this feature, you need to authenticate yourself with your Aruba passport account and collect a token that will be used for subsequent requests. This token will expire after a certain time, so you need to refresh it periodically. You can find more details about how to use the documentation interface and collect a token in the ArubaOS-CX REST API Guide1.

• Question 35:

  Refer to the scenario.

  A customer has an Aruba ClearPass cluster. The customer has AOS-CX switches that implement 802.1X authentication to ClearPass Policy Manager (CPPM).

  Switches are using local port-access policies.

  The customer wants to start tunneling wired clients that pass user authentication only to an Aruba gateway cluster. The gateway cluster should assign these clients to the "eth- internet" role. The gateway should also handle assigning clients

  to their VLAN, which is VLAN 20.

  The plan for the enforcement policy and profiles is shown below:

  

  The gateway cluster has two gateways with these IP addresses:

  Gateway 1

  1.

  VLAN 4085 (system IP) = 10.20.4.21

  2.

  VLAN 20 (users) = 10.20.20.1

  3.

  VLAN 4094 (WAN) = 198.51.100.14

  Gateway 2

  1.

  VLAN 4085 (system IP) = 10.20.4.22

  2.

  VLAN 20 (users) = 10.20.20.2

  3.

  VLAN 4094 (WAN) = 198.51.100.12

  VRRP on VLAN 20 = 10.20.20.254

  The customer requires high availability for the tunnels between the switches and the gateway cluster. If one gateway falls, the other gateway should take over its tunnels. Also, the switch should be able to discover the gateway cluster regardless of whether one of the gateways is in the cluster.

  Assume that you have configured the correct UBT zone and port-access role settings. However, the solution is not working.

  What else should you make sure to do?

  A. Assign VLAN 20 as the access VLAN on any edge ports to which tunneled clients might connect.

  B. Create a new VLAN on the AOS-CX switch and configure that VLAN as the UBT client VLAN.

  C. Assign sufficient VIA licenses to the gateways based on the number of wired clients that will connect.

  D. Change the port-access auth-mode mode to client-mode on any edge ports to which tunneled clients might connect.

  Correct Answer: B

  The correct answer is B. Create a new VLAN on the AOS-CX switch and configure that VLAN as the UBT client VLAN.

  User-based tunneling (UBT) is a feature that allows the AOS-CX switches to tunnel the traffic from wired clients to a mobility gateway cluster, where they can be assigned a role and a VLAN based on their authentication and authorization 1.

  To enable UBT, the switches need to have a UBT zone configured with the IP addresses of the gateways, and a UBT client VLAN configured with the ubt-client-vlan command 2. The UBT client VLAN is a special VLAN that is used to

  encapsulate the traffic from the tunneled clients before sending it to the gateways. The UBT client VLAN must be different from any other VLANs used on the switch or the network, and it must not be assigned to any ports or interfaces on the

  switch 2. The UBT client VLAN is only used internally by the switch for UBT, and it is not visible to the clients or the gateways. In this scenario, the customer wants to tunnel the clients that pass user authentication to the gateway cluster,

  where they will be assigned to VLAN 20. Therefore, the switch must have a UBT client VLAN configured that is different from VLAN 20 or any other VLANs on the network. For example, the switch can use VLAN 4000 as the UBT client VLAN,

  as shown in one of the web search results 3. The switch must also have a UBT zone configured with the system IP addresses of the gateways as the primary and backup controllers, as explained in question 3.

  The other options are not correct or relevant for this issue:

  Option A is not correct because assigning VLAN 20 as the access VLAN on any edge ports to which tunneled clients might connect would conflict with UBT. The access VLAN is the VLAN that is assigned to untagged traffic on a port, and it is

  used for local switching on the switch 4. If VLAN 20 is assigned as the access VLAN, then the traffic from the clients will not be tunneled to the gateways, but rather switched locally on VLAN 20. This would defeat the purpose of UBT and

  cause inconsistency in role and VLAN assignment.

  Option C is not correct because VIA licenses are not required for UBT. VIA licenses are required for enabling VPN services on Aruba Mobility Controllers for remote access clients using Aruba Virtual Intranet Access (VIA) software . VIA

  licenses are not related to UBT or wired clients.

  Option D is not correct because changing the port-access auth-mode mode to client-mode on any edge ports to which tunneled clients might connect would not affect UBT. The port-access auth-mode mode determines how a port handles

  authentication requests from multiple clients connected to a single port . Client- mode is the default mode that allows only one client per port, while multi-client- mode allows multiple clients per port. The port-access auth-mode mode does not

  affect how UBT works or how traffic is tunneled from a port.

• Question 36:

  Refer to the scenario.

  # Introduction to the customer

  You are helping a company add Aruba ClearPass to their network, which uses Aruba network infrastructure devices.

  The company currently has a Windows domain and Windows CA. The Window CA issues certificates to domain computers, domain users, and servers such as domain controllers. An example of a certificate issued by the Windows CA is shown here.

  

  The company is in the process of adding Microsoft Endpoint Manager (Intune) to manage its mobile clients. The customer is maintaining the on-prem AD for now and uses Azure AD Connect to sync with Azure AD.

  # Requirements for issuing certificates to mobile clients

  The company wants to use ClearPass Onboard to deploy certificates automatically to mobile clients enrolled in Intune. During this process, Onboard should communicate with Azure AD to validate the clients. High availability should also be

  provided for this scenario; in other words, clients should be able to get certificates from Subscriber 2 if Subscriber 1 is down.

  The Intune admins intend to create certificate profiles that include a UPN SAN with the UPN of the user who enrolled the device.

  # Requirements for authenticating clients

  The customer requires all types of clients to connect and authenticate on the same corporate SSID.

  The company wants CPPM to use these authentication methods:

  1.

  EAP-TLS to authenticate users on mobile clients registered in Intune

  2.

  TEAR, with EAP-TLS as the inner method to authenticate Windows domain computers and the users on them To succeed, EAP-TLS (standalone or as a TEAP method) clients must meet these requirements:

  1.

  Their certificate is valid and is not revoked, as validated by OCSP

  2.

  The client's username matches an account in AD

  # Requirements for assigning clients to roles

  After authentication, the customer wants the CPPM to assign clients to ClearPass roles based on the following rules:

  1.

  Clients with certificates issued by Onboard are assigned the "mobile-onboarded" role

  2.

  Clients that have passed TEAP Method 1 are assigned the "domain-computer" role

  3.

  Clients in the AD group "Medical" are assigned the "medical-staff" role

  4.

  Clients in the AD group "Reception" are assigned to the "reception-staff" role

  The customer requires CPPM to assign authenticated clients to AOS firewall roles as follows:

  1.

  Assign medical staff on mobile-onboarded clients to the "medical-mobile" firewall role

  2.

  Assign other mobile-onboarded clients to the "mobile-other" firewall role

  3.

  Assign medical staff on domain computers to the "medical-domain" firewall role

  4.

  All reception staff on domain computers to the "reception-domain" firewall role

  5.

  All domain computers with no valid user logged in to the "computer-only" firewall role

  6.

  Deny other clients access

  # Other requirements

  Communications between ClearPass servers and on-prem AD domain controllers must be encrypted.

  # Network topology

  For the network infrastructure, this customer has Aruba APs and Aruba gateways, which are managed by Central. APs use tunneled WLANs, which tunnel traffic to the gateway cluster. The customer also has AOS-CX switches that are not managed by Central at this point.

  

  # ClearPass cluster IP addressing and hostnames

  A customer's ClearPass cluster has these IP addresses:

  1.

  Publisher = 10.47.47.5

  2.

  Subscriber 1 = 10.47.47.6

  3.

  Subscriber 2 = 10.47.47.7

  4.

  Virtual IP with Subscriber 1 and Subscriber 2 = 10.47.47.8

  The customer's DNS server has these entries

  1.

  cp.acnsxtest.com = 10.47.47.5

  2.

  cps1.acnsxtest.com = 10.47.47.6

  3.

  cps2.acnsxtest.com = 10.47.47.7

  4.

  radius.acnsxtest.com = 10.47.47.8

  5.

  onboard.acnsxtest.com = 10.47.47.8

  You have started to create a CA to meet the customer's requirements for issuing certificates to mobile clients, as shown in the exhibit below.

  

  What change will help to meet those requirements and the requirements for authenticating clients?

  A. Change the EST authentication method to use an external validator.

  B. Change the EST Digest Algorithm to SHA-512.

  C. Recreate the CA as a registration authority under Azure AD.

  D. Specify an OCSP responder, setting the hostname to localhost.

  Correct Answer: A

• Question 37:

  Refer to the exhibit.

  

  Aruba ClearPass Policy Manager (CPPM) is using the settings shown in the exhibit. You reference the tag shown in the exhibit in enforcement policies related to NASes of several types, including Aruba APs, Aruba gateways, and AOS-CX switches.

  What should you do to ensure that clients are reclassified and receive the correct treatment based on the tag?

  A. Change the RADIUS action to [Aruba Wireless -Terminate Session] which is supported by all the NASes in question.

  B. Change the RADIUS action to [Aruba Wireless - Bounce Switch Port] which is supported by all the NASes in question.

  C. Enable profiling in each service using one of these enforcement profiles. Set the profiling action to the correct one for the NASes using that service.

  D. Set the Tags Update Action to No Action. Then instead enable the RADIUS CoAs using enforcement profiles in the rules that match clients with the tag shown in the exhibit.

  Correct Answer: C

  According to the ClearPass Policy Manager User Guide1, the tag shown in the exhibit is a Device Insight tag, which is used to classify and identify devices based on their behavior and characteristics. Device Insight tags can be used as conditions in enforcement policies to apply different actions or roles to devices based on their tags. However, in order to ensure that devices are reclassified and receive the correct treatment based on their tags, profiling must be enabled in each service that uses one of these enforcement profiles. Profiling is a feature that allows ClearPass to dynamically discover and profile devices on the network, and update their attributes and tags accordingly. Profiling also allows ClearPass to send RADIUS Change of Authorization (CoA) messages to the network access servers (NASes) that control the access of the devices, and instruct them to reauthenticate or terminate the sessions of the devices that have changed their tags. The profiling action must be set to the correct one for the NASes using that service, as different NASes may support different types of CoA messages. Therefore, option C is the correct answer.

• Question 38:

  Refer to the scenario.

  # Introduction to the customer

  You are helping a company add Aruba ClearPass to their network, which uses Aruba network infrastructure devices.

  The company currently has a Windows domain and Windows CA. The Window CA issues certificates to domain computers, domain users, and servers such as domain controllers. An example of a certificate issued by the Windows CA is shown here.

  

  

  The company is in the process of adding Microsoft Endpoint Manager (Intune) to manage its mobile clients. The customer is maintaining the on-prem AD for now and uses Azure AD Connect to sync with Azure AD.

  # Requirements for issuing certificates to mobile clients

  The company wants to use ClearPass Onboard to deploy certificates automatically to mobile clients enrolled in Intune. During this process, Onboard should communicate with Azure AD to validate the clients. High availability should also be

  provided for this scenario; in other words, clients should be able to get certificates from Subscriber 2 if Subscriber 1 is down.

  The Intune admins intend to create certificate profiles that include a UPN SAN with the UPN of the user who enrolled the device.

  # Requirements for authenticating clients

  The customer requires all types of clients to connect and authenticate on the same corporate SSID.

  The company wants CPPM to use these authentication methods:

  1.

  EAP-TLS to authenticate users on mobile clients registered in Intune

  2.

  TEAR, with EAP-TLS as the inner method to authenticate Windows domain computers and the users on them To succeed, EAP-TLS (standalone or as a TEAP method) clients must meet these requirements:

  1.

  Their certificate is valid and is not revoked, as validated by OCSP

  2.

  The client's username matches an account in AD # Requirements for assigning clients to roles After authentication, the customer wants the CPPM to assign clients to ClearPass roles based on the following rules:

  1.

  Clients with certificates issued by Onboard are assigned the "mobile-onboarded" role

  2.

  Clients that have passed TEAP Method 1 are assigned the "domain-computer" role

  3.

  Clients in the AD group "Medical" are assigned the "medical-staff" role

  4.

  Clients in the AD group "Reception" are assigned to the "reception-staff" role The customer requires CPPM to assign authenticated clients to AOS firewall roles as follows:

  1.

  Assign medical staff on mobile-onboarded clients to the "medical-mobile" firewall role

  2.

  Assign other mobile-onboarded clients to the "mobile-other" firewall role

  3.

  Assign medical staff on domain computers to the "medical-domain" firewall role

  4.

  All reception staff on domain computers to the "reception-domain" firewall role

  5.

  All domain computers with no valid user logged in to the "computer-only" firewall role

  6.

  Deny other clients' access # Other requirements Communications between ClearPass servers and on-prem AD domain controllers must be encrypted. # Network topology For the network infrastructure, this customer has Aruba APs and Aruba gateways, which are managed by Central. APs use tunneled WLANs, which tunnel traffic to the gateway cluster. The customer also has AOS-CX switches that are not

  managed by Central at this point.

  

  # ClearPass cluster IP addressing and hostnames A customer's ClearPass cluster has these IP addresses:

  1.

  Publisher = 10.47.47.5

  2.

  Subscriber 1 = 10.47.47.6

  3.

  Subscriber 2 = 10.47.47.7

  4.

  Virtual IP with Subscriber 1 and Subscriber 2 = 10.47.47.8

  The customer's DNS server has these entries

  1.

  cp.acnsxtest.com = 10.47.47.5

  2.

  cps1.acnsxtest.com = 10.47.47.6

  3.

  cps2.acnsxtest.com = 10.47.47.7

  4.

  radius.acnsxtest.com = 10.47.47.8

  5.

  onboard.acnsxtest.com = 10.47.47.8

  You have created a role mapping policy as shown in the exhibits below.

  

  What is one change that you need to make to this policy?

  A. In rule 1 change Subject-CN to Issuer-CN.

  B. Move rules 2 and 3 to the top of the list.

  C. Change the rules evaluation mechanism to first applicable.

  D. Change the default role to 'mobile-onboarded*

  Correct Answer: A

• Question 39:

  A customer has an AOS 10 architecture, consisting of Aruba AP and AOS-CX switches, managed by Aruba Central. The customer wants to obtain information about the clients, such as their general category and OS. What should you explain?

  A. The customer must deploy Aruba gateways in order to receive any client profiling information.

  B. You will need to set up Aruba Central as a secondary IP helper for client VLANs, but this will not interfere with existing operations.

  C. Aruba Central will automatically derive this information using telemetry from the Aruba devices.

  D. The customer should set up a dedicated switch VSX group to sniff packets and direct them to Aruba Central.

  Correct Answer: C

  Aruba Central can provide visibility and profiling of clients using the Client Insights feature, which is an AI-powered solution that uses native infrastructure telemetry to identify and classify clients based on their OS and general category. This feature does not require any additional hardware or software, such as gateways, IP helpers, or packet sniffers. It works by collecting and analyzing data from the Aruba APs and AOS-CX switches that are managed by Aruba Central. You can find more information about Client Insights in the Visibility and profiling solutions | HPE Aruba Networking page and the Clients Profile - Aruba page.

• Question 40:

  Refer to the scenario.

  A customer has an AOS10 architecture that is managed by Aruba Central. Aruba infrastructure devices authenticate clients to an Aruba ClearPass cluster.

  In Aruba Central, you are examining network traffic flows on a wireless IoT device that is categorized as "Raspberry Pi" clients. You see SSH traffic. You then check several more wireless IoT clients and see that they are sending SSH also.

  You want a relatively easy way to communicate the information that an IoT client has used SSH to Aruba CPPM.

  What is one prerequisite?

  A. Enable event processing on subscribers in the ClearPass cluster.

  B. In CPPM's CA trust list, add the Aruba Infrastructure usage to the DigiCert certificate.

  C. Obtain a data collector token from Central's platform integration settings.

  D. Create an API application and token within the REST API settings.

  Correct Answer: C