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HP Aruba Certified Network Security Professional Exam Sample Questions (Q125-Q130):

NEW QUESTION # 125
Refer to Exhibit:

An HPE Aruba Networking 9x00 gateway is part of an HPE Aruba Networking Central group that has the settings shown in the exhibit. What would cause the gateway to drop traffic as part of its IDPS settings?

A. Traffic showing anomalous behavior
B. Its IDPS engine failing
C. Its site-to-site VPN connections failing
D. Traffic matching a rule in the active ruleset

Answer: D

Explanation:
1. IDPS Mode Configuration Overview
The exhibit shows the HPE Aruba Networking Central settings for the Gateway IDS/IPS configuration:
* Mode: Configured for Intrusion Prevention System (IPS), meaning that the gateway actively blocks traffic identified as threats.
* Fail Strategy: Configured to Block, meaning that if the gateway cannot determine the traffic's nature due to a system issue, it will block the traffic.
* Ruleset: The gateway uses a predefined set of intrusion detection/prevention rules (ruleset version
9861), which is updated automatically every day.
2. Traffic Evaluation in IPS Mode
In IPS mode, the gateway analyzes traffic against the active ruleset:
* If traffic matches a rule in the ruleset and is deemed malicious, the gateway will drop the traffic as part of its prevention mechanism.
* The ruleset defines specific conditions (e.g., signatures of known attacks, protocol anomalies) under which traffic should be blocked.
3. Explanation of Each Option
* A. Its site-to-site VPN connections failing:
* Incorrect:
* Site-to-site VPN connection issues do not directly trigger traffic drops under IDPS settings.
* IDPS is focused on detecting and preventing malicious activity, not general connectivity issues.
* B. Traffic matching a rule in the active ruleset:
* Correct:
* In IPS mode, the gateway drops traffic that matches any predefined rules in the active ruleset.
* For example, if traffic matches the signature of a known exploit or attack, it is immediately blocked.
* C. Its IDPS engine failing:
* Incorrect:
* The fail strategy determines how the gateway behaves in the event of an IDPS engine failure.
* In this case, the fail strategy is set to Block, but this applies only if the engine itself fails, not as a proactive traffic drop mechanism.
* D. Traffic showing anomalous behavior:
* Incorrect:
* While anomalous behavior may be logged or flagged, it does not necessarily lead to traffic drops unless it matches a specific rule in the active ruleset.
* Anomaly detection alone is not sufficient for IPS action without explicit rule matches.
Final Outcome:
Traffic is dropped only when it matches a rule in the active ruleset, ensuring targeted prevention of malicious activity.
References
* Aruba Gateway IDS/IPS Configuration Guide.
* Aruba Central Ruleset Management Documentation.
* Best Practices for Configuring Fail Strategies in IPS Mode.

NEW QUESTION # 126
A company wants to use HPE Aruba Networking ClearPass Policy Manager (CPPM) to profile Linux devices.
You have decided to schedule a subnet scan of the devices' subnets. Which additional step should you complete before scheduling the scan?

A. Enable WMI probing in the cluster-wide parameters.
B. Configure SNMP in the network device settings for the switches that support the Linux devices.
C. Set up SSH accounts on CPPM and map them to the Linux devices' subnets.
D. Enable the Data Port in the ClearPass server settings and connect that port to the network.

Answer: D

Explanation:
* Subnet Scan Requirements for Profiling:
* For ClearPass to scan and profile devices in a subnet, the Data Port must be enabled on the ClearPass server and connected to the network.
* This ensures that ClearPass can send and receive the required packets for device discovery and profiling.
* Option Analysis:
* Option A: Incorrect. SSH accounts are not required for subnet scanning.
* Option B: Incorrect. WMI probing is for Windows systems, not Linux devices.
* Option C: Correct. The Data Port is essential for subnet scans and must be properly configured and connected.
* Option D: Incorrect. SNMP is used for network device monitoring, not Linux device profiling.

NEW QUESTION # 127
You have configured an AOS-CX switch to implement 802.1X on edge ports. Assume ports operate in the default auth-mode. VolP phones are assigned to the
"voice" role and need to send traffic that is tagged for VLAN 12.
Where should you configure VLAN 12?

A. As the trunk native VLAN on edge ports and the trunk native VLAN on the "voice" role
B. As the allowed trunk VLAN in the "voice" role (and not in the edge port settings)
C. As the trunk native VLAN in the "voice" role (and not in the edge port settings)
D. As a trunk allowed VLAN on edge ports and the trunk native VLAN in the "voice" role

Answer: B

Explanation:
When configuring 802.1X authentication on edge ports of an AOS-CX switch and assigning VoIP phones to a
"voice" role, the correct approach is to configure VLAN 12 as the allowed trunk VLAN in the "voice" role.
This setup ensures that traffic tagged for VLAN 12 is appropriately managed by the role applied to the VoIP phones. In AOS-CX switches, the role-based VLAN configuration allows for more granular control and ensures that the VoIP phones' traffic is handled correctly without altering the edge port settings, which typically operate with default settings for authentication.

NEW QUESTION # 128

All of the switches in the exhibit are AOS-CX switches.
What is the preferred configuration on Switch-2 for preventing rogue OSPF routers in this network?

A. Configure OSPF authentication on VLANs 10-19 in password mode.
B. Configure OSPF authentication on Lag 1 in MD5 mode.
C. Configure passive-interface as the OSPF default and disable OSPF passive on Lag 1.
D. Disable OSPF entirely on VLANs 10-19.

Answer: B

Explanation:
To prevent rogue OSPF routers in the network shown in the exhibit, the preferred configuration on Switch-2 is to configure OSPF authentication on Lag 1 in MD5 mode. This setup enhances security by ensuring that only routers with the correct MD5 authentication credentials can participate in the OSPF routing process.
This method protects the OSPF sessions against unauthorized devices that might attempt to introduce rogue routing information into the network.
1.OSPF Authentication: Implementing MD5 authentication on Lag 1 ensures that OSPF updates are secured with a cryptographic hash. This prevents unauthorized OSPF routers from establishing peering sessions and injecting potentially malicious routing information.
2.Secure Communication: MD5 authentication provides a higher level of security compared to simple password authentication, as it uses a more robust hashing algorithm.
3.Applicability: Lag 1 is the primary link between Switch-1 and Switch-2, and securing this link helps protect the integrity of the OSPF routing domain.

NEW QUESTION # 129
Refer to the exhibit.

You have verified that AOS-CX Switch-1 has constructed an IP-to-MAC binding table in VLANs 10-19.
Now you need to enable ARP inspection for the endpoint connected to Switch-1. What must you do first to prevent traffic disruption?

A. Configure DHCP snooping on VLANs 10-19 on Switch-2.
B. Configure ARP inspection on VLANs 10-19 on Switch-2.
C. Configure Switch-1 uplinks as trusted ARP inspection ports.
D. Create a static IP-to-MAC binding on Switch-1 for the DHCP server.

Answer: C

Explanation:
Dynamic ARP Inspection (DAI):
* ARP inspection verifies ARP packets against a trusted IP-to-MAC binding table to prevent ARP spoofing attacks.
* DHCP snooping is required to construct the IP-to-MAC binding table dynamically.
* To avoid traffic disruption, uplink ports that connect to trusted switches, DHCP servers, or routers must be explicitly configured as trusted ports for ARP inspection.
Steps to Prevent Traffic Disruption:
* Trust the Uplinks: ARP inspection must treat uplink ports as trusted to allow ARP traffic from legitimate DHCP servers and upstream switches.
* Enable DHCP Snooping: DHCP snooping must be enabled on Switch-2 to ensure consistent IP-to- MAC bindings upstream.
Why the Answer is Correct:
* Option A: Incorrect. ARP inspection on Switch-2 is important but not required first to prevent disruption on Switch-1.
* Option B: Incorrect. DHCP snooping must be enabled upstream eventually, but this alone will not stop immediate traffic disruption on Switch-1.
* Option C: Correct. Switch-1 uplinks must be trusted ARP inspection ports first to allow legitimate upstream traffic and prevent ARP disruption.
* Option D: Incorrect. Static bindings are not required if DHCP snooping is enabled, and they are manual, limiting scalability.
Conclusion:
To avoid traffic disruption, configure Switch-1 uplinks as trusted ARP inspection ports to ensure valid ARP traffic can pass upstream and downstream.

NEW QUESTION # 130
......

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