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Palo Alto Networks SD-WAN Engineer Sample Questions (Q34-Q39):
NEW QUESTION # 34
When configuring a Path Policy rule for a "Real-Time Video" application, the administrator wants to ensure the traffic uses the path with the lowest packet loss.
How does the Prisma SD-WAN ION determine the "Packet Loss" metric for a given path when there is no active user traffic flowing on that link?
Answer: C
Explanation:
Comprehensive and Detailed Explanation
Prisma SD-WAN utilizes Link Quality Monitoring (LQM) to maintain a real-time health score for every WAN path.
To ensure the system knows the quality of a path before sending critical user traffic onto it, the ION device uses Active Probing.
Mechanism: The ION sends synthetic probe packets (typically UDP) across the Secure Fabric (VPN tunnels) and Direct Internet paths to its peers. These probes measure Latency, Jitter, and Packet Loss.
Active vs. Passive: While the system does use Passive Monitoring (observing actual user flows) when traffic is present to reduce overhead, Active Probes are essential for idle links or backup paths. Without active probing, the ION would have no data to make an intelligent steering decision for the first packet of a new video call. This ensures that "Real-Time" policies always have up-to-date metrics to select the best path immediately.
NEW QUESTION # 35
When planning a software upgrade for a large fleet of ION devices, what is the recommended best practice regarding the "Software Version" assigned in the Site Summary?
Answer: C
Explanation:
Comprehensive and Detailed Explanation
The best practice for managing upgrades in a large-scale Prisma SD-WAN environment is the Canary or Phased Rollout approach, utilizing Site Tags.
Risk Mitigation: Upgrading all sites simultaneously (Option B) is highly risky. If the new software version has an unforeseen bug or compatibility issue with a specific circuit type, the entire network could face an outage.
Tag-Based Management: Administrators should create tags such as "Upgrade-Phase-1" (Pilot sites) or "Region-North". By assigning the specific Software Version to the Tag (rather than the individual site or the global default), the controller pushes the update only to that subset of devices.
Procedure:
Apply update to "Pilot" tag (5 sites). Monitor for 24-48 hours.
Apply update to "Region-1" tag (50 sites). Monitor.
Eventually, update the Global default once confidence is high.
Option A is unscalable, and Option D is incorrect as the administrator retains full control over when upgrades occur; they are not forced automatically without policy configuration.
NEW QUESTION # 36
An organization has created a custom internal application definition for "Inventory_App" on the Prisma SD-WAN controller based on its destination IP address and port (L3/L4 rule). The application server IP has just changed.
After updating the custom application definition on the controller, how is this change propagated to the branch ION devices?
Answer: C
Explanation:
Comprehensive and Detailed Explanation
In Prisma SD-WAN, Custom Applications are global policy objects managed centrally on the controller.
Immediate Propagation: When an administrator creates or modifies a Custom Application definition (e.g., updating the IP subnet or port for an internal app), the Prisma SD-WAN controller automatically pushes this update to all connected ION devices in the tenant.
No Manual Push: Unlike some legacy firewall management paradigms (like Panorama "Commit and Push"), the Prisma SD-WAN architecture is "intent-based" and continuously synchronized. A change to a global object like an App Definition is considered a live configuration change and is distributed immediately via the secure control channel.
No Reboot: The ION data plane updates its classification engine dynamically without interrupting traffic or requiring a reboot. This ensures that policy enforcement (steering "Inventory_App" to the correct path) remains accurate in real-time.
NEW QUESTION # 37
User-ID integration is configured for a Prisma SD-WAN deployment. Branch-1 has the user-to-IP mappings available, and User-1 is mapped to IP-1.
To which two use cases can User-ID based zone-based firewall policies be applied? (Choose two.)
Answer: A,C
Explanation:
Comprehensive and Detailed Explanation
In Prisma SD-WAN (CloudGenix), Zone-Based Firewall (ZBFW) policies rely on the device's ability to map an IP address to a User-ID to enforce identity-based rules. The key to this question is understanding where the mapping exists and which direction the policy attributes (Source User vs. Destination User) apply to.
1. Mapping Location (Branch-1): The prompt states that Branch-1 has the user-to-IP mapping for User-1. For the most effective and scalable security enforcement, policies should be applied at the source (ingress) device where the traffic originates and where the user identity is known. This prevents unauthorized traffic from consuming WAN bandwidth only to be dropped at the destination. Therefore, the Branch-1 ION is the correct enforcement point for User-1's traffic.
2. Source vs. Destination User:
User-1 is the Source: In all scenarios, User-1 is the initiator of the traffic. Therefore, the security rule must match on Source User-ID.
Options C and D are incorrect because they suggest using Destination User-ID based rules to control User-1. Destination User-ID rules are used when the target of the traffic is a known user (e.g., VoIP calls to a specific user's phone), not when filtering based on the sender. Furthermore, relying on the DC or Branch-2 ION to enforce policies for User-1 would require the propagation of User-ID mappings across the overlay, whereas local enforcement at Branch-1 is the standard architectural model.
3. Valid Use Cases (A and B):
Option A (SaaS/Internet): The Branch-1 ION acts as the internet gateway. It can use the local mapping (IP-1 = User-1) to allow or deny access to specific SaaS applications (Direct Internet Access) based on the user's identity (e.g., "Allow Marketing Group to access Social Media").
Option B (Internal Segmentation): The Branch-1 ION can enforce policies for traffic moving between local zones (e.g., from a "Users" VLAN to a "Servers" VLAN within the branch). Since the ION routes this traffic and holds the mapping, it can enforce Source User-ID policies to secure local private applications.
NEW QUESTION # 38
Which statement is valid when integrating Prisma SD-WAN with Prisma Access remote networks?
Answer: D
Explanation:
Comprehensive and Detailed Explanation
When deploying Prisma Access for Remote Networks (connecting branch offices), the licensing and throughput model is based on aggregate bandwidth allocated to specific compute locations (regions).
Bandwidth Allocation (Option D): Administrators must purchase and allocate a specific amount of bandwidth (e.g., 500 Mbps, 1 Gbps) to a Prisma Access "Compute Location" (e.g., US West, Europe Central). This allocated bandwidth is then shared as a pool among all the branch sites (Remote Networks) that onboard and terminate their IPSec tunnels at that specific location. The system does not allocate bandwidth on a strict per-site basis but rather enforces the limit on the aggregate throughput of the compute node itself.
Policy Enforcement (Option A): Security policies for Prisma Access are enforced in the cloud (at the Prisma Access Service Processing Node), not pushed down to the branch ION devices for local enforcement. The ION device handles local segmentation (ZBFW) and traffic steering, but the "Remote Network" security stack resides in the cloud.
Path Usage (Option C): Prisma SD-WAN is designed to utilize Active/Active paths. When a branch has multiple internet circuits connected to Prisma Access, the CloudBlade and ION automatically build tunnels on all compatible paths and can load-balance traffic across them based on application performance (SLA), rather than defaulting to a strict Active/Standby model for internet traffic.
NEW QUESTION # 39
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