Prepare Smarter for the HPE6-A78 Exam

In the AAA (Authentication, Authorization, and Accounting) framework, the role of the Network Access Server (NAS) is to act as a gateway that enforces access to network

services and sends accounting information to the AAA server. The NAS initially requests authentication information from the user and then passes that information to the

AAA server. It also enforces the access policies as provided by the AAA server after authentication and provides accounting data to the AAA server based on user activity.

[References:, Technical literature on AAA protocols which often includes a description of the roles and responsibilities of a Network Access Server., Network security resources that discuss the

NAS function within the AAA framework., ]

EAP-TLS and PEAP both provide secure authentication methods, but they differ in their requirements for client-side authentication. EAP-TLS requires both the client (supplicant) and the server to authenticate each other with certificates, thereby ensuring a very high level of security. On the other hand, PEAP requires a server-side certificate to create a secure tunnel and allows the client to authenticate using less stringent methods, such as a username and password, which are then protected by the tunnel. This makes PEAP more flexible in environments where client-side certificates are not feasible.

[References:, EAP-TLS and PEAP authentication protocols comparison., , ]

When an ArubaOS solution detects a rogue AP with Wireless Intrusion Prevention (WIP), the most crucial information that can help locate the rogue device is the detecting devices .

This is because the detecting devices can provide the physical location or the network topology context where the rogue AP has been detected 1 .

The detecting devices are typically the Air Monitors (AMs) or Access Points (APs) in the network that have identified the rogue AP’s presence. These devices can provide information

such as the signal strength and the direction from which the rogue AP’s signals are being received. By triangulating this information from multiple detecting devices, it becomes

possible to pinpoint the physical location of the rogue AP 2 .

Additionally, the detecting devices can log events and alerts that can be reviewed to understand the rogue AP’s behavior, such as the channels it is

operating on and the potential impact on the authorized wireless network 1 . This information is vital for network administrators to quickly

and effectively respond to the threat posed by the rogue AP.

In contrast, the match method (A) and match type © relate to how the rogue AP is classified and identified by the system,

which is useful for classification but not for physical location. The confidence level (D) indicates the system’s certainty in the

classification but does not aid in locating the device 2 .

Endpoint classification in HPE Aruba Networking ClearPass Policy Manager (CPPM) involves identifying and categorizing devices on the network to enforce access policies.

CPPM supports two types of profiling methods: passive and active.

Passive Profiling : Involves observing network traffic that devices send as part of their normal operation, without CPPM sending any requests to the device.

Examples include DHCP fingerprinting, HTTP User-Agent analysis, and TCP fingerprinting.

Active Profiling : Involves CPPM sending requests to the device to gather information, such as SNMP scans, WMI scans, or SSH probes.

Option A , " TCP fingerprinting, " is correct. TCP fingerprinting is a passive profiling method where CPPM analyzes TCP packet headers (e.g., TTL, window size)

in the device’s normal network traffic to identify its operating system. This does not require CPPM to send any requests to the device, making it a passive method.

Option B , " SSH scans, " is incorrect. SSH scans involve actively connecting to a device over SSH to gather information (e.g., system details), which is an active profiling method.

Option C , " WMI scans, " is incorrect. Windows Management Instrumentation (WMI) scans involve CPPM querying a Windows device to gather information (e.g., OS version, installed software),

which is an active profiling method.

Option D , " SNMP scans, " is incorrect. SNMP scans involve CPPM sending SNMP requests to a device to gather information (e.g., system description, interfaces), which is an active profiling method.

The HPE Aruba Networking ClearPass Policy Manager 6.11 User Guide states:

" Passive profiling methods observe network traffic that endpoints send as part of their normal operation, without ClearPass sending any requests to the device. An example of passive profiling is TCP fingerprinting, where ClearPass analyzes TCP packet headers (e.g., TTL, window size) to identify the device’s operating system. Active profiling methods, such as SNMP scans, WMI scans, or SSH scans, involve ClearPass sending requests to the device to gather information. " (Page 246, Passive vs. Active Profiling Section)

Additionally, the ClearPass Device Insight Data Sheet notes:

" Passive profiling techniques, such as TCP fingerprinting, allow ClearPass to identify devices without generating additional network traffic. By analyzing TCP attributes in the device’s normal traffic, ClearPass can fingerprint the OS, making it a non-intrusive method for endpoint classification. " (Page 3, Profiling Methods Section)

[References:, HPE Aruba Networking ClearPass Policy Manager 6.11 User Guide, Passive vs. Active Profiling Section, Page 246., ClearPass Device Insight Data Sheet, Profiling Methods Section, Page 3.===========]

Packet captures on an HPE Aruba Networking Mobility Controller (MC) are a powerful troubleshooting and analysis tool, allowing administrators to capture and analyze network traffic at various levels (e.g., control plane or data plane). The MC supports packet captures for both wired and wireless traffic, which can be filtered based on criteria such as IP address, MAC address, or port.

Option A , " The security team believes that a wireless endpoint connected to the MC is launching an attack and wants to examine the traffic more closely, " is correct. Packet captures are commonly used in security investigations to analyze the traffic of a specific endpoint suspected of malicious activity. For example, if a wireless client is suspected of launching an attack (e.g., a DoS attack or data exfiltration), a packet capture on the MC can capture the client’s traffic (filtered by MAC or IP address) for detailed analysis, helping the security team identify the nature of the attack.

Option B , " The company wants to use HPE Aruba Networking ClearPass Policy Manager (CPPM) to profile devices and needs to receive HTTP User-Agent strings from the MC, " is incorrect. While CPPM can use HTTP User-Agent strings for device profiling, this is typically achieved by mirroring HTTP traffic to CPPM (e.g., using a datapath mirror on the MC), not by setting up a packet capture. Packet captures are for manual analysis, not for feeding data to CPPM.

Option C , " You want the MC to analyze wireless clients ' traffic at a lower level, so that the AOS firewall can control Web traffic based on the destination URL, " is incorrect. The AOS firewall on the MC can control traffic based on applications or services (e.g., using deep packet inspection, DPI), but it does not support URL-based filtering directly. URL filtering typically requires an external solution (e.g., a web proxy or firewall). Packet captures are not used to enable URL-based control by the firewall.

Option D , " You want the MC to analyze wireless clients ' traffic at a lower level, so that the AOS firewall can control the traffic based on application, " is incorrect. The AOS firewall can already perform application-based control using DPI (if enabled), without requiring a packet capture. Packet captures are for manual analysis, not for enabling firewall functionality.

The HPE Aruba Networking AOS-8 8.11 User Guide states:

" Packet captures on the Mobility Controller are useful for troubleshooting and security investigations. For example, if the security team suspects that a wireless endpoint is launching an attack, you can set up a packet capture on the MC’s data plane to capture the endpoint’s traffic. Use the command packet-capture datapath < filter > (e.g., filter by the client’s MAC address) to capture the traffic, which can then be analyzed to identify malicious activity. " (Page 515, Packet Capture Section)

Additionally, the HPE Aruba Networking Security Guide notes:

" Packet captures are a critical tool for security teams to investigate potential attacks. By capturing traffic from a specific wireless client suspected of malicious behavior, administrators can analyze the packets to determine the nature of the attack, such as a DoS attack or unauthorized data exfiltration. " (Page 65, Security Troubleshooting Section)

[References:, HPE Aruba Networking AOS-8 8.11 User Guide, Packet Capture Section, Page 515., HPE Aruba Networking Security Guide, Security Troubleshooting Section, Page 65.===========]