HPE7-A02 Exam Dumps - Aruba Certified Network Security Professional Exam

When setting up a ClearPass cluster, it is critical to ensure secure communication between the cluster nodes and the client devices. For this purpose, certain certificates must be properly configured.

1. Why HTTPS Requires a CA-Signed Certificate?

HTTPS communication is used for inter-cluster communication and for the web-based user interface that administrators use to manage the ClearPass cluster.

Before joining the cluster, it is strongly recommended to install a CA-signed HTTPS certificate on the Subscriber to ensure secure communication and prevent warnings/errors due to untrusted certificates.

Without a CA-signed certificate, the Subscriber might use a self-signed certificate, leading to security risks and lack of trust validation.

2. Analysis of Other Certificate Types

B. Database:

Incorrect: Database communications within ClearPass clusters are secured using internal certificates or keys. These are not user-facing and do not require a CA-signed certificate before joining the cluster.

C. RADIUS/EAP:

Incorrect: RADIUS/EAP certificates are important for client authentication, but they are not required on the Subscriber prior to cluster joining. These can be configured after the Subscriber is part of the cluster.

D. RadSec:

Incorrect: RadSec is an optional feature for secure RADIUS communication over TLS, and its certificate configuration is typically performed post-cluster setup.

Final Recommendation

To ensure secure cluster operations and seamless web-based management, a CA-signed HTTPS certificate should be installed on the Subscriber before it joins the ClearPass cluster.

References

ClearPass Deployment Guide for Version 6.9.

Best Practices for Certificate Management in ClearPass Clusters.

HPE Aruba ClearPass Cluster Configuration Guide.

ClearPass Role Mapping Policy:

The Endpoint namespace is used to reference attributes and tags related to endpoint devices.

Device Insight Tags are part of endpoint profiling information and are stored in the Endpoint Repository.

Option Analysis:

Option A: Correct. The Endpoint namespace includes Device Insight Tags.

Option B: Incorrect. TIPS refers to system attributes and configuration data, not endpoint tags.

Option C: Incorrect. Device is not a valid namespace in this context.

Option D: Incorrect. Application relates to application-level attributes, not Device Insight Tags.

To tunnel VoIP phone traffic from AOS-CX switches to an HPE Aruba Networking gateway, you need to configure a User-Based Tunneling (UBT) reserved VLAN on the switches. This VLAN is dedicated for tunneling purposes and ensures that the VoIP traffic is correctly identified and tunneled to the gateway where security policies can be applied.

1.UBT Configuration: Setting a UBT reserved VLAN ensures that the switch knows which VLAN to use for tunneling traffic to the gateway.

2.Traffic Tunneling: The reserved VLAN helps in segregating the VoIP traffic, ensuring it is handled securely and according to the configured policies at the gateway.

3.Policy Application: By tunneling the traffic, the gateway can apply advanced security policies to the VoIP traffic.

When using "Tips

" conditions within an 802.1X service's enforcement policy, you should enable caching roles and posture attributes from previous sessions in the service's enforcement settings. This ensures that ClearPass retains posture information from previous authentications, which is necessary for making decisions based on the current posture state of an endpoint. By caching these attributes, ClearPass can apply appropriate enforcement actions based on the device's posture status.

When transitioning from Intrusion Detection System (IDS) mode to Intrusion Prevention System (IPS) mode, it’s critical to review and refine configurations to ensure legitimate traffic is not blocked. Here's the reasoning behind each option:

A. Disable traffic inspection and reboot before re-enabling traffic inspection with the new mode.

Incorrect:

Transitioning to IPS mode does not require a full reboot or disabling traffic inspection.

This step is unnecessary and could lead to downtime that impacts network operations.

B. Change the mode on one gateway at a time to establish a smoother transition period.

Incorrect:

While a phased approach might help in some large deployments, it does not directly address the potential for legitimate traffic to be blocked by IPS mode.

IPS operates in real-time, so misconfigured rules or policies need to be addressed before enabling IPS on any gateway.

C. Consider applying a stricter IPS policy to minimize issues during the transition period.

Incorrect:

A stricter IPS policy increases the likelihood of false positives, which could disrupt legitimate business-critical traffic.

During the transition, the focus should be on minimizing disruptions by fine-tuning policies, not making them stricter.

D. Check for legitimate traffic that has been flagged as a threat and allow list the associated rules.

Correct:

In IDS mode, the system only detects and logs suspicious traffic but does not block it. Reviewing these logs for false positives allows the organization to fine-tune policies and allow list legitimate traffic before transitioning to IPS mode.

By doing this, the company ensures that IPS mode will block actual threats while permitting legitimate traffic.

This is a proactive step to prevent unnecessary disruptions to normal operations when IPS mode is enabled.

References

HPE Aruba Gateway IDS/IPS Configuration Guide.

Best Practices for Transitioning from IDS to IPS Modes in Aruba Networks.

Aruba Network Threat Management Documentation.

To ensure that HPE Aruba Networking ClearPass Policy Manager (CPPM) applies tag-based rules to a client immediately after learning the client has that tag, verify that both 802.1X services have the "Profile Endpoints" option enabled and an appropriate Change of Authorization (CoA) profile selected in the Profiler tab. This setup ensures that when a device is profiled and tagged, CPPM can immediately enforce the updated policies through CoA.

1.Profile Endpoints: Enabling this option ensures that endpoint profiling is active, allowing CPPM to gather and use device information dynamically.

2.CoA Profile: Selecting an appropriate CoA profile ensures that CPPM can push policy changes immediately to the network devices, applying the new rules without delay.

3.Real-Time Enforcement: This configuration allows for the immediate application of new tags and associated policies, ensuring compliance with security requirements.

Why MD5 Authentication on Lag 1 is Preferred:

Lag 1 is the primary link between Switch-2 and Switch-1, both of which are Layer 3 switches running OSPF.

By enabling MD5 authentication, OSPF routers exchange authenticated packets, preventing unauthorized or rogue OSPF routers from forming adjacencies or injecting routes.

MD5 is a secure authentication method and ensures the integrity and authenticity of OSPF communications.

Other Options Analysis:

A. Configure OSPF authentication on VLANs 10-19 in password mode: While configuring authentication on VLAN interfaces could secure VLAN-specific OSPF traffic, it is less effective because the main threat of rogue OSPF comes from unauthorized L3 devices connected via the backbone (Lag 1).

C. Disable OSPF entirely on VLANs 10-19: Disabling OSPF on these VLANs is not a preferred solution because OSPF is needed to route traffic in this design.

D. Configure passive-interface as the OSPF default and disable OSPF passive on Lag 1: While passive interfaces prevent OSPF from forming adjacencies, it does not directly prevent rogue routers. Passive mode only limits OSPF advertisements on specific interfaces.