Contextual Exchange for Better Decisions:

HPE Aruba ClearPass can integrate with third-party solutions like MDM and firewalls to exchange

contextual information about endpoints (e.g., device type, posture, location).

This integration allows ClearPass and the third-party solutions to make better access control and

security decisions.

For example:

An MDM can inform CPPM about device compliance, and CPPM can adjust enforcement policies

dynamically.

Firewalls can receive updated context about users and devices to enforce policies more effectively.

Option Analysis:

Option A: Correct. Exchanging contextual information improves access control decisions.

Option B: Incorrect. CPPM does not provide signature-based threat detection.

Option C: Incorrect. CPPM does not offload policy decisions; it integrates for collaboration.

Option D: Incorrect. CPPM does not replace third-party traffic filtering capabilities.

The Network Analytics Engine (NAE) in AOS-CX switches provides intelligent monitoring,

troubleshooting, and performance analysis through predefined or custom scripts. Here’s an analysis

of the guidelines for NAE:

A. Each switch model has a maximum number of supported monitors, and one agent might have

multiple monitors.

Correct:

Each AOS-CX switch model has hardware and software limitations, including the number of agents

and monitors it supports.

Monitors are data collection points for tracking specific metrics like interface statistics, CPU usage, or

custom-defined parameters.

Agents are scripts that use monitors to evaluate data, trigger actions, or generate alerts.

Since one agent can have multiple monitors, the total number of monitors might impact the

scalability of agents.

B. You can install multiple scripts on a switch, but you can deploy only one agent per script.

Incorrect:

Multiple agents can be deployed from the same script if they monitor different parameters or have

different configurations.

The limitation is usually related to the total number of agents and monitors supported by the switch

model, not the script itself.

C. The switch will permit you to deploy as many NAE agents as you want, but they might degrade the

switch functionality.

Incorrect:

AOS-CX enforces hardware and software limits on the number of agents and monitors. These limits

are designed to prevent degradation of switch performance.

You cannot deploy an unlimited number of agents, as the system enforces these restrictions.

D. When you use custom scripts, you can create as many agents from each script as you want.

Incorrect:

While you can use custom scripts to create agents, the total number of agents is subject to the

switch's maximum supported limits.

The scalability of agents is still bound by hardware and software constraints, even with custom

scripts.

Reference

HPE Aruba AOS-CX Network Analytics Engine Configuration Guide.

Aruba AOS-CX Switch Series Technical Specifications.

Best Practices for NAE Deployment in AOS-CX Networks.

Integrating HPE Aruba Networking ClearPass Policy Manager (CPPM) and HPE Aruba Networking

ClearPass Device Insight (CPDI) can help a company implement Zero Trust Security by allowing CPDI

to use tags to inform CPPM that clients are using prohibited applications. CPPM can then take action,

such as telling the network infrastructure to quarantine those clients, ensuring that only compliant

and trusted devices have network access.

1. Device Insight Tags: CPDI can monitor client behavior and tag devices that are using prohibited

applications.

2. Policy Enforcement: CPPM can use these tags to apply specific enforcement actions, such as

quarantining non-compliant devices.

3. Zero Trust Implementation: This integration supports Zero Trust Security by ensuring that all

devices are continuously monitored and controlled based on their behavior and compliance with

security policies.

Reference: Aruba's ClearPass integration guides detail how CPDI and CPPM can work together to

enhance security by leveraging device insights and dynamic policy enforcement.

802.1X Authentication Workflow: Requires the root CA certificate of the issuing authority for the

supplicants’ certificates. This ensures that the server can validate the client certificate during the

EAP-TLS handshake.

Trusted CA Usage: In ClearPass, certificates with "Trusted CA" usage are used for validating client and

server identities during secure authentication exchanges.

Option A: Incorrect. The "ClearPass Server certificate" is used for server-side identity verification and

is not used to validate client certificates.

Option B: Incorrect. Database usage is unrelated to RADIUS/EAP or certificate validation.

Option C: Incorrect. While LDAP/AD integration supports certificate validation, this is not the primary

purpose of Trusted CAs for 802.1X.

Option D: Correct. Trusted CAs for EAP are required to validate client certificates during the

authentication process.

By uploading the root CA as a "Trusted CA with EAP usage," the CPPM can properly authenticate the

certificates presented by the supplicants during EAP-TLS negotiations.

Why Monitoring Control Plane Policing (CoPP) with an NAE Agent Is Effective for Detecting DoS

Attacks

Control Plane Policing (CoPP): AOS-CX switches use CoPP to protect the CPU from excessive traffic

caused by DoS attacks (e.g., ARP floods, ICMP floods). CoPP enforces rate limits and drops malicious

traffic at the control plane level.

NAE (Network Analytics Engine) Agent:

The NAE on AOS-CX switches can monitor CoPP counters in real time and trigger alerts if thresholds

for certain traffic types (e.g., ICMP, ARP) are exceeded.

Admins can use NAE to automate detection and respond faster to DoS attacks.

Analysis of Each Option

A . Deploy an NAE agent on the switches to monitor control plane policing (CoPP):

Correct:

NAE agents provide real-time visibility into CoPP behavior, helping detect DoS attacks more quickly.

By analyzing CoPP statistics, the NAE can pinpoint abnormal traffic patterns and alert admins.

This is the most efficient and scalable solution for this use case.

B . Configure the switches to implement RADIUS accounting to HPE Aruba Networking ClearPass and

enable HPE Aruba Networking ClearPass Insight:

Incorrect:

While ClearPass can provide visibility into user authentication and device activity, it is not specifically

designed to detect or mitigate DoS attacks against switches.

C . Implement ARP inspection on all VLANs that support end-user devices:

Incorrect:

ARP inspection helps mitigate ARP spoofing or poisoning, but it does not directly address detection

of DoS attacks like ICMP or ARP floods.

It is a preventative measure, not a detection tool.

D . Enabling debugging of security functions on the switches:

Incorrect:

Debugging logs can help troubleshoot specific issues but are not practical for real-time detection of

DoS attacks.

Enabling debugging can overload the switch and is not suitable for proactive monitoring.

Final Recommendation

Deploying an NAE agent to monitor CoPP is the best solution because it provides real-time detection,

alerting, and insights into traffic patterns that indicate DoS attacks.

Reference

AOS-CX Network Analytics Engine (NAE) Configuration Guide.

HPE Aruba AOS-CX Control Plane Policing Documentation.

Best Practices for Protecting Switches Against DoS Attacks in Aruba Networks.

Internet Key Exchange (IKE)/IKEv2 plays a crucial role in an HPE Aruba Networking client-to-site VPN

by helping to negotiate the IPsec Security Association (SA) automatically and securely. IKE/IKEv2

handles the authentication and key exchange processes, ensuring that both the client and the VPN

gateway can establish a secure IPsec tunnel.

1. SA Negotiation: IKE/IKEv2 automates the negotiation of the Security Association, which defines

the parameters for the secure IPsec tunnel.

2. Secure Authentication: It provides a secure method for authenticating the communicating parties

and exchanging cryptographic keys.

3. Efficiency: Using IKE/IKEv2 simplifies the setup and maintenance of secure VPN connections,

enhancing the overall security and reliability of the VPN.

Reference: Documentation on IPsec VPNs and IKE/IKEv2 protocols explains how these protocols

facilitate secure and automated negotiation of IPsec tunnels, ensuring robust client-to-site VPN

connections.

The use case for the HPE Aruba Networking ClearPass OnGuard dissolvable agent is implementing a

one-time compliance scan. The dissolvable agent is designed to perform a compliance check without

requiring a permanent installation on the client device. This is ideal for environments where a quick,

temporary assessment of the device's security posture is needed without the overhead of a

persistent agent.

1. Dissolvable Agent: The dissolvable agent is downloaded and executed on the client device for a

single session, performing the necessary compliance checks before being removed automatically.

2. One-time Compliance Scan: This method is particularly useful for guest or unmanaged devices

where a temporary compliance scan is sufficient to ensure security standards are met.

3. Minimal Impact: Since the agent does not persist on the client device, it minimizes the impact on

the user's system and does not require ongoing maintenance or updates.

Reference: ClearPass OnGuard documentation details the capabilities and use cases for the

dissolvable agent, emphasizing its role in one-time compliance assessments.

To ensure that HPE Aruba Networking ClearPass Policy Manager (CPPM) can apply the correct access

levels based on a client's device category after discovering new clients, you need to enable the

"Profile Endpoints" option in the Service tab. This option allows CPPM to profile and categorize

endpoints dynamically, ensuring that the appropriate access levels are applied based on the device's

characteristics. Enabling this feature ensures that new devices are accurately profiled and that access

policies can be enforced based on the updated device information.

Reference: Aruba ClearPass documentation and profiling guides detail the configuration and use of

endpoint profiling to enhance access control and policy enforcement based on device categories.

To apply Virtual Network based Tunneling (VNBT) to a particular group of users and assign them to an

overlay network with VNI 3000, you should configure the users' AOS-CX role to set the Access VLAN

to the VLAN mapped to VNI 3000. This ensures that when users connect, their traffic is tunneled

through the specified VNI, integrating seamlessly with the EVPN VXLAN solution.

1. Access VLAN Configuration: Setting the Access VLAN to the VLAN mapped to VNI 3000 ensures

that users' traffic is directed to the correct virtual network.

2. EVPN VXLAN Integration: This setup allows the AOS-CX switch to participate in the EVPN VXLAN

solution, ensuring that user traffic is properly encapsulated and tunneled.

3. Role-Based Assignment: Configuring the role with the correct VLAN mapping ensures that users

are dynamically assigned to the appropriate virtual network based on their role.

Reference: Aruba's documentation on AOS-CX configuration and VXLAN integration provides detailed

steps for setting up VNBT and role-based VLAN assignments.

To capture only the traffic sent in the mirroring session between an AOS-CX switch and a

management station running Wireshark, you should apply a capture filter that isolates the specific

traffic of interest. In this case, using the filter udp port 5555 will capture the traffic associated with

the mirroring session. This is because AOS-CX switches typically use UDP port 5555 for mirrored

traffic, ensuring that only the relevant mirrored packets are captured and excluding other traffic

generated by the management station.

Reference: Aruba's AOS-CX documentation and network management guides detail the configuration

and monitoring of traffic mirroring sessions, including the use of specific ports for mirrored traffic.