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  • Exam Name: Aruba Certified Network Security Expert Written Exam
  • Last Update: 01-Mar-2024
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HPE6-A84 Questions and Answers

Question # 1

Refer to the scenario.

A customer is using an AOS 10 architecture with Aruba APs and Aruba gateways (two per site). Admins have implemented auto-site clustering for gateways with the default gateway mode disabled. WLANs use tunneled mode to the gateways.

The WLAN security is WPA3-Enterprise with authentication to an Aruba ClearPass Policy Manager (CPPM) cluster VIP. RADIUS communications use RADIUS, not RadSec.

For which devices does CPPM require network device entries?

A.

Forgateways' actual IP addresses and dynamic authorization VRRP addresses

B.

For gateways' actual IP addresses and AP clusters' virtual IP addresses for dynamic authorization

C.

For APs' actual IP addresses

D.

ForAP clusters'virtual IP addresses

Question # 2

Refer to the scenario.

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

HPE6-A84 question answerPermitted to receive IP addresses with DHCP

HPE6-A84 question answerPermitted access to DNS services from 10.8.9.7 and no other server

HPE6-A84 question answerPermitted access to all subnets in the 10.1.0.0/16 range except denied access to 10.1.12.0/22

HPE6-A84 question answerDenied access to other 10.0.0.0/8 subnets

HPE6-A84 question answerPermitted access to the Internet

HPE6-A84 question answerDenied access to the WLAN for a period of time if they send any SSH traffic

HPE6-A84 question answerDenied access to the WLAN for a period of time if they send any Telnet traffic

HPE6-A84 question answerDenied access to all high-risk websites

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

The exhibits below show the configuration for the role.

HPE6-A84 question answer

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 8 is “ipv4 any any any permit”.)

A.

In the “medical-mobile” policy, move rules 2 and 3 between rules 7 and 8.

B.

In the “medical-mobile” policy, change the subnet mask in rule 3 to 255.255.248.0.

C.

Move the rule in the “apprf-medical-mobile-sacl” policy between rules 7 and 8 in the “medical-mobile” policy.

D.

In the “medical-mobile” policy, change the source in rule 8 to “user.”

Question # 3

What is a common characteristic of a beacon between a compromised device and a command and control server?

A.

Use of IPv6 addressing instead of IPv4 addressing

B.

Lack of encryption

C.

Use of less common protocols such as SNAP

D.

Periodic transmission of small, identically sized packets

Question # 4

Refer to the exhibit.

HPE6-A84 question answer

You have been given this certificate to install on a ClearPass server for the RADIUS/EAP and RadSec usages.

What is one issue?

A.

The certificate has a wildcard in the subject common name.

B.

The certificate uses a fully qualified the '.local" domain name.

C.

The certificate does not have a URI subject alternative name

D.

The certificate does not have an IP subject alternative name

Question # 5

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.

HPE6-A84 question answer

HPE6-A84 question answer

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:

HPE6-A84 question answerEAP-TLS to authenticate users on mobile clients registered in Intune

HPE6-A84 question answerTEAR, 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:

HPE6-A84 question answerTheir certificate is valid and is not revoked, as validated by OCSP

HPE6-A84 question answerThe 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:

HPE6-A84 question answerClients with certificates issued by Onboard are assigned the “mobile-onboarded” role

HPE6-A84 question answerClients that have passed TEAP Method 1 are assigned the “domain-computer” role

HPE6-A84 question answerClients in the AD group “Medical” are assigned the “medical-staff” role

HPE6-A84 question answerClients 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:

HPE6-A84 question answerAssign medical staff on mobile-onboarded clients to the “medical-mobile” firewall role

HPE6-A84 question answerAssign other mobile-onboarded clients to the “mobile-other” firewall role

HPE6-A84 question answerAssign medical staff on domain computers to the “medical-domain” firewall role

HPE6-A84 question answerAll reception staff on domain computers to the “reception-domain” firewall role

HPE6-A84 question answerAll domain computers with no valid user logged in to the “computer-only” firewall role

HPE6-A84 question answerDeny 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.

HPE6-A84 question answer

# ClearPass cluster IP addressing and hostnames

A customer’s ClearPass cluster has these IP addresses:

HPE6-A84 question answerPublisher = 10.47.47.5

HPE6-A84 question answerSubscriber 1 = 10.47.47.6

HPE6-A84 question answerSubscriber 2 = 10.47.47.7

HPE6-A84 question answerVirtual IP with Subscriber 1 and Subscriber 2 = 10.47.47.8

The customer’s DNS server has these entries

HPE6-A84 question answercp.acnsxtest.com = 10.47.47.5

HPE6-A84 question answercps1.acnsxtest.com = 10.47.47.6

HPE6-A84 question answercps2.acnsxtest.com = 10.47.47.7

HPE6-A84 question answerradius.acnsxtest.com = 10.47.47.8

HPE6-A84 question answeronboard.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.

HPE6-A84 question answer

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.

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