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Palo Alto Networks Network Security Analyst 認定 NetSec-Analyst 試験問題 (Q237-Q242):
質問 # 237
A Palo Alto Networks firewall is configured with multiple virtual routers. Virtual Router 'VR_lnternal' handles internal network segments, and Virtual Router 'VR External' handles internet-facing interfaces. A PBF rule is required to forward specific traffic from 'VR_lnternal' (source 10.10.10.0/24, destination 172.16.1.0/24, application: custom-app) to an isolated security zone 'VR DMZ' via a dedicated interface (ethernet1/5) connected to 'VR DMZ'. However, the traffic needs to be routed through 'VR External' first for specific inspection, before being routed to 'VR DMZ'. Which PBF configuration is required for this inter-VR traffic steering, considering the initial traffic resides in 'VR Internal'?
- A. Multiple Correct Answers: 1. Create a PBF rule in 'VR_lntemal' matching the source, destination, and application. 2. For the action, select 'Forward' and specify 'Virtual Router: VR_External'. This directs the traffic from VR_lnternal to VR_External's routing table. 3. In 'VR_External', ensure a static route exists for 172.16.1.0/24 via 'ethernet1/5' (interface connecting to VR DMZ) and its next-hop IR
- B. Create a PBF rule in 'VR Internal' with 'Source Zone: Internal', 'Destination Zone: DMZ', 'Source Address: 10.10.10.0/24', 'Destination Address: 172.16.1.0/24', 'Application: custom-app', 'Egress Interface: ethernet1/5' (which belongs to VR_DMZ), 'Next Hop: (VR_DMZ_Router_IP)'.
- C. Create a PBF rule in 'VR Internal' with 'Source Zone: Internal', 'Destination Zone: DMZ', 'Source Address: 10.10.10.0/24', 'Destination Address: 172.16.1.0/24', 'Application: custom-app', 'Action: Forward', 'Egress Interface: (interface connecting VR_lnternal to VR_External)', 'Next Hop: (VR_External_Router_IP)'. A second PBF rule or static route in 'VR External' would then handle forwarding to 'VR DMZ'.
- D. Create a PBF rule in 'VR Internal' with 'Source Zone: Internal', 'Destination Zone: DMZ', 'Source Address: 10.10.10.0/24', 'Destination Address: 172.16.1.0/24', 'Application: custom-app', 'Action: Forward', 'Virtual Router: VR_External', 'Fall back to: No'. A corresponding PBF rule in VR_External would then forward to VR DMZ.
- E. Create a PBF rule in 'VR Internal' with 'Source Zone: Internal', 'Destination Zone: DMZ', 'Source Address: 10.10.10.0/24', 'Destination Address: 172.16.1.0/24', 'Application: custom-app', 'Action: Forward', 'Virtual Router: VR External', 'Next Hop: (VR_External_Router_IP for the link to VR DMZ)'. A route in VR_External would then send it to VR DMZ.
正解:A、D
解説:
This question tests the understanding of inter-VR PBF. When traffic needs to be steered to a different Virtual Router, the PBF rule's 'Action' must specify 'Virtual Router' as the forwarding method, followed by the target Virtual Router. Once traffic is handed over to the new VR, that VR's routing table (or subsequent PBF rules within that VR) will determine the next hop. Option D and E are essentially describing the same correct approach with slight variations in wording. Step 1 (in VR_lnternal): The PBF rule must match the specific traffic and, for its 'Action', choose 'Forward' and select 'Virtual Router: VR_External'. This explicitly tells the firewall to take the matched traffic and 'inject' it into the routing context of VR_External. Step 2 (in VR_External): Once the traffic is in VR_External, VR_External's routing table (or PBF rules if further complex steering is needed) will take over. For the scenario, a static route in VR_External for 172.16.1.0/24 via the interface to VR_DMZ (ethernet1/5) with its next-hop is the logical next step. The question implies 'inspection' in VR_External, which means it will pass through VR Extemal's security policies. Option A is incorrect because a PBF rule in one VR cannot directly specify an egress interface that belongs to a different VR, nor can it directly know the next-hop within another VR's context. Option B is incorrect as it implies an explicit inter-VR interface, which is not how Palo Alto Networks VRs work; they are logical separations. Option C is closer but is incomplete in its description of the next step within VR_External. Both D and E correctly highlight the key 'Virtual Router' action in PBF and the subsequent routing in the target VR.
質問 # 238
A large-scale deployment uses Panorama to manage hundreds of Palo Alto Networks firewalls. An External Dynamic List (EDL) for 'IP Address' type is centrally configured on Panorama, pointing to an internal threat intelligence server. Which of the following statements accurately describes the operational flow and considerations when this EDL is applied to Security Policy rules pushed from Panorama to the managed firewalls?
- A. Each managed firewall independently fetches the EDL content directly from the threat intelligence server based on its configured refresh interval, and Panorama only distributes the EDL object definition.
- B. Only firewalls with Panorama's 'Threat Prevention' subscription can utilize EDLs configured on Panorama.
- C. Panorama fetches the EDL content and pushes the entire list to each firewall during a policy commit.
- D. If the threat intelligence server is unreachable, Panorama will cache the last known good list and push it to all firewalls.
- E. EDLs configured on Panorama can only be used in Pre-Rulebase or Post-Rulebase policies, not in shared rulebases.
正解:A
解説:
This question tests the understanding of how Panorama manages dynamic content. Option B (Correct): Panorama manages the definition of the EDL (its name, type, source URL, refresh interval, etc.) and pushes this definition to managed firewalls. However, each individual firewall is responsible for fetching the actual content of the EDL directly from the configured source URL. This design distributes the load and ensures firewalls have the most up-to-date lists even if Panorama is temporarily unavailable. Option A is incorrect; Panorama does not typically fetch and push the content of EDLs. Option C is incorrect; EDL functionality is core and not tied to specific subscriptions like Threat Prevention. Option D is incorrect; EDLs can be used in any rulebase (shared, device-group, template). Option E is incorrect; Panorama does not cache EDL content for pushing to firewalls if the source is unreachable; the individual firewalls attempt to fetch and will log errors if they fail.
質問 # 239
An IoT smart building system uses BACnet/IP for HVAC control. The security team discovers a device sending unauthorized 'Write Property' requests to BACnet objects that control critical ventilation fans, potentially disrupting air quality. They have identified the rogue device's MAC address and IP address, but its type (vendor/model) is not yet fully classified by Device-ID. How can the Palo Alto Networks NGFW be configured, leveraging IoT security concepts, to immediately block these specific 'Write Property' requests from this rogue device, while allowing legitimate BACnet traffic from authorized devices?
- A. Configure an 'IP-MAC Binding' entry for the rogue device, then create a 'Threat Prevention' custom signature to detect the 'Write Property' request payload and block it.
- B. Create a new 'Security Policy' rule with the rogue device's IP address as 'Source', the HVAC PLC's IP as 'Destination', 'Application: bacnet-ip', and a 'Service' of 'any', with an 'Action: Deny'. Place this rule highest in the rulebase.
- C. Leverage a combination of 'IoT Device Group' for authorized BACnet devices, and an explicit 'Deny' rule that uses 'Application Function Filtering' for BACnet/Lp to block 'Write Property' requests, with 'Source: Any' and 'Destination: HVAC PLCs', placed higher than the allow rule.
- D. Create a new 'IoT Security Profile' specifically for the rogue device's IP address, enable 'Application Function Filtering' for BACnet/IP to block 'Write Property', and create a 'Security Policy' rule matching only this rogue device to apply this profile.
- E. Within an existing 'IoT Security Profile' applied to BACnet traffic, configure 'Application Function Filtering' for BACnet/IP to block 'Write Property' function codes. Apply this profile to all relevant IoT policy rules.
正解:D
解説:
Option C is the most precise and immediate solution given the constraint. While option B is generally good for all unauthorized 'Write Property' requests, it might impact legitimate devices if their 'Write Property' functions are also needed. Option C allows for surgical enforcement: it targets only the rogue device's traffic and applies the granular 'Application Function Filtering' (blocking 'Write Property') specifically to it. This ensures legitimate BACnet traffic from other devices continues unimpeded. Option A is too broad; it blocks all BACnet from the rogue device. Option D's 'Threat Prevention' custom signature is a more complex and potentially slower reaction than direct policy. Option E would block Write Property' from ALL devices, not just the rogue one, which contradicts the requirement to allow legitimate traffic.
質問 # 240
An organization is migrating its cloud applications from a public internet connection to a dedicated AWS Direct Connect link through a Palo Alto Networks firewall. To achieve this, all traffic to AWS public IP ranges (e.g., EC2, S3) from the internal network must be forwarded over the Direct Connect interface (ethernet1/3) with a specific next-hop router. Other internet-bound traffic should continue using the primary internet uplink (ethernet1/1 ). Which of the following PBF actions are critical to ensure that if the Direct Connect link fails, the AWS-bound traffic automatically fails over to the primary internet uplink without manual intervention?
- A. Set up a static route for the AWS ranges with ethernet1/3 as the next hop, and configure BIDirectional Forwarding Detection (BFD) on the Direct Connect interface.
- B. Configure a PBF rule with 'Action: Forward', 'Egress Interface: ethernet1/3', 'Next Hop: AWS Router_IP', and then create a second PBF rule with a higher priority for the same AWS destinations pointing to ethernet1/1 , which will only activate manually.
- C. Create a PBF rule with 'Action: Forward', 'Egress Interface: ethernet1/3', 'Next Hop: AWS_Router_IP', and specify 'Fall back to: Yes' with the primary internet uplink's virtual router and next-hop.
- D. Implement an ECMP route for the AWS public IP ranges, distributing traffic between ethernet1/3 and ethernet1/1 based on load.
- E. Configure a PBF rule with 'Action: Forward', 'Egress Interface: ethernet1/3', 'Next Hop: AWS_Router_IP', and enable 'Monitor Link Group' for ethernet1/3 to trigger a route removal.
正解:C
解説:
Palo Alto Networks PBF rules have a built-in 'Fall back to' option specifically for high availability. When configured, if the primary egress interface or next-hop specified in the PBF rule becomes unreachable (based on link monitoring or ARP/Ping monitoring), the traffic matching that rule will automatically fall back to the specified alternative forwarding method (e.g., default route, specific virtual router, or specific next hop). Option A describes link monitoring but not the automatic fallback PBF feature. Option C is for load balancing, not active-passive failover in this context. Option D requires manual intervention and doesn't leverage the PBF fallback mechanism. Option E describes general routing failover, but PBF provides a more granular, policy-based failover specific to the steered traffic.
質問 # 241
A large enterprise uses a Palo Alto Networks firewall in an active/passive HA pair. They need to implement a data loss prevention (DLP) solution for outbound traffic, specifically to prevent sensitive intellectual property (IP) from leaving the network via email (SMTP, SMTPS) or file transfers (FTP, SMB). The IP is defined by a set of keywords and regular expressions. Additionally, they must ensure that this DLP inspection does not significantly degrade performance for high-volume, non-sensitive traffic. How would you configure Data Filtering profiles and apply them, considering performance and security?
- A. Utilize a common Security Profile Group with Antivirus, Anti-Spyware, and Vulnerability Protection for all outbound traffic. Then, create a separate Security Profile Group containing the Data Filtering profile for sensitive IP. Apply this Data Filtering-specific group to a separate 'DLP security policy rule, ensuring it's evaluated before the general outbound rules.
- B. Create a single Data Filtering profile. Define multiple data patterns (keywords, regex) for the IR Set the action for all patterns to 'block'. Apply this Data Filtering profile to a Security Profile Group, which is then attached to all outbound security policy rules. This ensures full coverage.
- C. Create a Data Filtering profile for each sensitive IP type. Configure a custom data pattern (e.g., 'ProjectX-code', 'CustomerDB-records'). Set the action to 'block' for high severity. Create security policy rules specifically for SMTP/SMTPS, FTP, and SMB applications destined for the untrust zone. Attach a Security Profile Group containing only the Data Filtering profile to these specific rules.
- D. Define a Data Filtering profile with sensitive data patterns. Set the action to 'block' and enable 'log at session start' and 'log at session end'. Apply this profile to a Security Profile Group. Create a security policy rule for each relevant application (SMTP, SMTPS, FTP, SMB) with source as 'internal zones' and destination as 'untrust zone', applying the Security Profile Group to these rules. Ensure the 'any' application is not used.
- E. Configure a Data Filtering profile with sensitive patterns and 'block' action. Implement PBF to divert all outbound SMTP, SMTPS, FTP, and SMB traffic to a dedicated Vwire interface. On this Vwire, apply a Security Profile Group that includes the Data Filtering profile and other relevant threat prevention. Other traffic bypasses this path.
正解:D
解説:
Option E provides the most robust and efficient solution. Dedicated Data Filtering Profile: Clearly defines the sensitive data patterns. Action 'block' with extensive logging: Ensures prevention and auditability. Application-specific Security Policy Rules: Crucially, this targets DLP inspection only to the applications (SMTP, SMTPS, FTP, SMB) and traffic directions (outbound to untrust) that are relevant for data exfiltration. This minimizes performance impact on other high-volume, non-sensitive traffic. Security Profile Group: Bundling the Data Filtering profile into a group is standard best practice for reusability. Avoid 'any' application: This prevents unnecessary DLP scanning on non-relevant traffic, directly addressing the performance concern. Option A would apply DLP to all outbound traffic, causing performance issues. Option B suggests separate profiles per IP type, which can be merged into one profile with multiple patterns for efficiency. Option C is a less direct way of applying DLP than direct application to relevant policy rules. Option D uses PBF and Vwire, which is an unnecessary network topology change for this security profile requirement.
質問 # 242
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