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Vendor: HP
Certifications: ACA - Network Security
Exam Code: HPE6-A84
Exam Name: Aruba Certified Network Security Expert Written
Updated: Jun 25, 2024
Q&As: 60
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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
On CPPM, you are creating the authentication method shown in the exhibit below:
You will use the method for standalone EAP-TLS and for inner methods in TEAP. What should you do?
A. Configure OCSP override and set the OCSP URL to localhost/onboard/mdps ocspphp/2
B. Enable certificate comparison.
C. Enable authorization.
D. Configure OCSP override and leave the OCSP URL blank.
Correct Answer: A
Refer to the exhibit.
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
Correct Answer: B
The exhibit shows a screenshot of a certificate that has the following information: The subject common name (CN) is *.clearpass.local, which is a wildcard domain name that matches any subdomain under clearpass.local. The subject alternative names (SANs) are DNS Name=clearpass.local and DNS Name=*.clearpass.local, which are the same as the subject CN. The issuer CN is clearpass.local, which is the same as the subject domain name. The key usage (KU) is Digital Signature and Key Encipherment, which are required for RADIUS/EAP and RadSec usages. The extended key usage (EKU) is Server Authentication and Client Authentication, which are also required for RADIUS/EAP and RadSec usages. The issue with this certificate is that it uses a fully qualified the `.local' domain name, which is a reserved domain name for local networks that cannot be registered on the public Internet. This means that the certificate cannot be verified by any public certificate authority (CA), and therefore cannot be trusted by any external devices or servers that communicate with ClearPass. This could cause problems for RADIUS/EAP and RadSec usages, as they rely on secure and authenticated connections between ClearPass and other devices or servers. To avoid this issue, the certificate should use a valid domain name that can be registered on the public Internet, such as clearpass.com or clearpass.net. This way, the certificate can be issued by a public CA that is trusted by most devices and servers, and can be verified by them. Alternatively, if the certificate is intended to be used only within a private network, it should be issued by a private CA that is trusted by all devices and servers within that network.
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
The customer needs a secure way for users to enroll their new wireless clients in Intune. You are recommending a new WLAN that will provide the users with limited access for the enrollment.
You have set up captive portal for clients on this WLAN to a web page with instructions for enrolling devices. You will need to add several hostnames to the captive portal allowlist manually.
What is one of those hostnames?
A. The hostname used by ClearPass Policy ManaGer's RADIUS services
B. The ClearPass Onboard hostname referenced in an Onboard provisioninG profile
C. The ClearPass Onboard hostname referenced in Intune SCEP profiles
D. The hostname used by the on-prem domain controllers
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