What is one practice that can help you to maintain a digital chain of custody in your network?
Correct Answer: C
A digital chain of custody ensures that evidence (e.g., logs, timestamps) collected from a network can be reliably used in legal or forensic investigations. It requires maintaining the integrity and authenticity of data, including accurate timestamps for events. HPE Aruba Networking devices, such as Instant APs, Mobility Controllers (MCs), and AOS-CX switches, support features to help maintain a digital chain of custody. Option C, "Ensure that all network infrastructure devices receive a valid clock using authenticated NTP," is correct. Accurate and synchronized time across all network devices is critical for maintaining a digital chain of custody. Timestamps in logs (e.g., authentication events, traffic logs) must be consistent and verifiable. Network Time Protocol (NTP) is used to synchronize device clocks, and authenticated NTP ensures that the time source is trusted and not tampered with (e.g., using MD5 or SHA authentication). This practice ensures that logs from different devices can be correlated accurately during an investigation. Option A, "Enable packet capturing on Instant AP or Mobility Controller (MC) datapath on an ongoing basis," is incorrect. While packet capturing on the datapath (user traffic) can provide detailed traffic data for analysis, enabling it on an ongoing basis is impractical due to storage and performance constraints. Packet captures are typically used for specific troubleshooting or investigations, not for maintaining a chain of custody. Option B, "Ensure that all network infrastructure devices use RADIUS rather than TACACS+ to authenticate managers," is incorrect. The choice of RADIUS or TACACS+ for manager authentication does not directly impact the digital chain of custody. Both protocols can log authentication events, but the protocol used does not ensure the integrity of timestamps or evidence. Option D, "Enable packet capturing on Instant AP or Mobility Controller (MC) controlpath on an ongoing basis," is incorrect for similar reasons as Option A. Control path (control plane) packet captures include management traffic (e.g., between APs and MCs), but enabling them continuously is not practical and does not directly contribute to maintaining a chain of custody. Accurate timestamps in logs are more relevant. The HPE Aruba Networking Security Guide states: "Maintaining a digital chain of custody requires ensuring the integrity and authenticity of network logs and events. A critical practice is to ensure that all network infrastructure devices, such as Mobility Controllers and AOS-CX switches, receive a valid and synchronized clock using authenticated NTP. Use the command ntp server <ip-address> key <key-id> to configure authenticated NTP, ensuring that timestamps in logs are accurate and verifiable for forensic investigations." (Page 85, Digital Chain of Custody Section) Additionally, the HPE Aruba Networking AOS-8 8.11 User Guide notes: "Accurate time synchronization is essential for maintaining a digital chain of custody. Configure all devices to use authenticated NTP to synchronize their clocks with a trusted time source. This ensures that event logs, such as authentication and traffic logs, have consistent and reliable timestamps, which can be correlated across devices during an investigation." (Page 380, Time Synchronization Section) : HPE Aruba Networking Security Guide, Digital Chain of Custody Section, Page 85. HPE Aruba Networking AOS-8 8.11 User Guide, Time Synchronization Section, Page 380.
Question 77
Refer to the exhibit. A diem is connected to an ArubaOS Mobility Controller. The exhibit snows all Tour firewall rules that apply to this diem What correctly describes how the controller treats HTTPS packets to these two IP addresses, both of which are on the other side of the firewall 10.1 10.10 203.0.13.5
Correct Answer: B
Referring to the exhibit, the ArubaOS Mobility Controller treats HTTPS packets based on the firewall rules applied to the client. The rule that allows svc-https service for destination IP range 10.1.0.0 255.255.0.0 would permit an HTTPS packet to 10.1.10.10 since this IP address falls within the specified range. There are no rules shown that would allow traffic to the IP address 203.0.13.5; hence, the packet to this address would be dropped. References: ArubaOS firewall configuration guides detailing how firewall rules are interpreted and applied to traffic. Network security textbooks explaining firewall rule processing and packet filtering based on source and destination IP addresses.
Question 78
What is a reason to set up a packet capture on an Aruba Mobility Controller (MC)?
Correct Answer: A
Question 79
A company has an ArubaOS controller-based solution with a WPA3-Enterprise WLAN. which authenticates wireless clients to Aruba ClearPass Policy Manager (CPPM). The company has decided to use digital certificates for authentication A user's Windows domain computer has had certificates installed on it However, the Networks and Connections window shows that authentication has tailed for the user. The Mobility Controllers (MC's) RADIUS events show that it is receiving Access-Rejects for the authentication attempt. What is one place that you can you look for deeper insight into why this authentication attempt is failing?
Correct Answer: B
When an authentication attempt for a user's Windows domain computer is failing on a WPA3-Enterprise WLAN and the Mobility Controller is receiving Access-Rejects, one place to look for deeper insight is the RADIUS events within the CPPM Event Viewer. ClearPass Policy Manager (CPPM) logs all RADIUS authentication events, and the Event Viewer would show detailed information about why a particular authentication attempt was rejected. This could include reasons such as incorrect credentials, expired certificates, or policy mismatches. The CPPM Event Viewer is an essential troubleshooting tool within ClearPass to diagnose authentication issues, as indicated in the ClearPass Policy Manager documentation.
Question 80
What is an example of passive endpoint classification?
Correct Answer: A
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) : 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.
