HPE6-A78 exam questions

1. Question 1

   Single answer

   What is a vulnerability of an unauthenticated Dime-Heliman exchange?

   • A

     A hacker can replace the public values exchanged by the legitimate peers and launch an MITM attack.

   • B

     A brute force attack can relatively quickly derive Diffie-Hellman private values if they are able to obtain public values

   • C

     Diffie-Hellman with elliptic curve values is no longer considered secure in modem networks, based on NIST recommendations.

   • D

     Participants must agree on a passphrase in advance, which can limit the usefulness of Diffie- Hell man in practical contexts.

   Reveal answer

   Correct answer

   • A

     A hacker can replace the public values exchanged by the legitimate peers and launch an MITM attack.

   Explanation

   The vulnerability of an unauthenticated Diffie-Hellman exchange, particularly when it comes to the risk of a man-in-the-middle (MITM) attack, is a significant concern. In this scenario, a hacker can intercept the public values exchanged between two legitimate parties and substitute them with their own. This allows the attacker to decrypt or manipulate the messages passing between the two original parties without them knowing. This answer is based on the fundamental principles of how Diffie-Hellman key exchange works and its vulnerabilities without authentication mechanisms. Reference materials from cryptographic textbooks and security protocols detail these vulnerabilities, such as those found in standards and publications by organizations like NIST.

2. Question 2

   Multiple answer

   You configure an ArubaOS-Switch to enforce 802.1X authentication with ClearPass Policy Manager (CPPM) denned as the RADIUS server Clients cannot authenticate You check Aruba ClearPass Access Tracker and cannot find a record of the authentication attempt.

   What are two possible problems that have this symptom? (Select two)

   • A

     users are logging in with the wrong usernames and passwords or invalid certificates.

   • B

     Clients are configured to use a mismatched EAP method from the one In the CPPM service.

   • C

     The RADIUS shared secret does not match between the switch and CPPM.

   • D

     CPPM does not have a network device defined for the switch's IP address.

   • E

     Clients are not configured to trust the root CA certificate for CPPM's RADIUS/EAP certificate.

   Reveal answer

   Correct answer

   • C

     The RADIUS shared secret does not match between the switch and CPPM.

   • D

     CPPM does not have a network device defined for the switch's IP address.

   Explanation

   If clients cannot authenticate and there is no record of the authentication attempt in Aruba ClearPass Access Tracker, two possible problems that could cause this symptom are:

   The RADIUS shared secret does not match between the switch and CPPM. This mismatch would prevent the switch and CPPM from successfully communicating, so authentication attempts would fail, and no record would appear in Access Tracker.

   CPPM does not have a network device profile defined for the switch's IP address. Without a network device profile, CPPM would not recognize authentication attempts coming from the switch and would not process them, resulting in no logs in Access Tracker.

   The other options are incorrect because:

   Users logging in with the wrong credentials would still generate an attempt record in Access Tracker.

   Clients configured to use a mismatched EAP method would also generate an attempt record in Access Tracker.

   Clients not configured to trust the root CA certificate for CPPM's RADIUS/EAP certificate might fail authentication, but the attempt would still be logged in Access Tracker.

3. Question 3

   Single answer

   What is a benefit of deploying Aruba ClearPass Device insight?

   • A

     Highly accurate endpoint classification for environments with many devices types, including Internet of Things (loT)

   • B

     visibility into devices' 802.1X supplicant settings and automated certificate deployment

   • C

     Agent-based analysts of devices' security settings and health status, with the ability to implement quarantining

   • D

     Simpler troubleshooting of ClearPass solutions across an environment with multiple ClearPass Policy Managers

   Reveal answer

   Correct answer

   • A

     Highly accurate endpoint classification for environments with many devices types, including Internet of Things (loT)

   Explanation

   Aruba ClearPass Device Insight offers a significant benefit by providing highly accurate endpoint classification. This feature is particularly useful in complex environments with a wide variety of device types, including IoT devices. Accurate device classification allows network administrators to better understand the nature and behavior of devices on their network, which is crucial for implementing appropriate security policies and ensuring network performance and security.

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5. Question 4

   Single answer

   What is a benefit or using network aliases in ArubaOS firewall policies?

   • A

     You can associate a reputation score with the network alias to create rules that filler traffic based on reputation rather than IP.

   • B

     You can use the aliases to translate client IP addresses to other IP addresses on the other side of the firewall

   • C

     You can adjust the IP addresses in the aliases, and the rules using those aliases automatically update

   • D

     You can use the aliases to conceal the true IP addresses of servers from potentially untrusted clients.

   Reveal answer

   Correct answer

   • C

     You can adjust the IP addresses in the aliases, and the rules using those aliases automatically update

   Explanation

   In ArubaOS firewall policies, using network aliases allows administrators to manage groups of IP addresses more efficiently. By associating multiple IPs with a single alias, any changes made to the alias (like adding or removing IP addresses) are automatically reflected in all firewall rules that reference that alias. This significantly simplifies the management of complex rulesets and ensures consistency across security policies, reducing administrative overhead and minimizing the risk of errors.

6. Question 5

   Single answer

   What is a guideline for managing local certificates on an ArubaOS-Switch?

   • A

     Before installing the local certificate, create a trust anchor (TA) profile with the root CA certificate for the certificate that you will install

   • B

     Install an Online Certificate Status Protocol (OCSP) certificate to simplify the process of enrolling and re-enrolling for certificate

   • C

     Generate the certificate signing request (CSR) with a program offline, then, install both the certificate and the private key on the switch in a single file.

   • D

     Create a self-signed certificate online on the switch because ArubaOS-Switches do not support CA-signed certificates.

   Reveal answer

   Correct answer

   • A

     Before installing the local certificate, create a trust anchor (TA) profile with the root CA certificate for the certificate that you will install

   Explanation

   When managing local certificates on an ArubaOS-Switch, a recommended guideline is to create a trust anchor (TA) profile with the root CA certificate before installing the local certificate. This step ensures that the switch can verify the authenticity of the certificate chain during SSL/TLS communications. The trust anchor profile establishes a basis of trust by containing the root CA certificate, which helps validate the authenticity of any subordinate certificates, including the local certificate installed on the switch. This process is essential for enhancing security on the network, as it ensures that encrypted communications involving the switch are based on a verified certificate hierarchy.

   :

   ArubaOS-Switch security configuration guides that detail the process of certificate management, including the creation of trust anchor profiles.

   Security best practices and SSL/TLS implementation guidelines that emphasize the importance of establishing trusted certificate chains for secure communications.

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