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| Section | Objectives |
|---|---|
| Policy Configuration | - Application and Traffic Policy - Security Policy Integration - QoS and Traffic Engineering |
| Monitoring and Troubleshooting | - Troubleshooting Methodology - Dashboard and Analytics - Logs and System Health |
| Configuration and Deployment | - Initial Setup and Provisioning - WAN Interface Configuration - Network Segmentation (VLANs, Zones) |
| Prisma SD-WAN Architecture and Components | - Prisma SD-WAN Solution Overview - Data Center and Branch Architecture - Controllers and ION Devices |
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NEW QUESTION # 21
By default, how many days will Prisma SD-WAN VPNs stay operational before the keys expire when an ION device loses connection with the controller?
Answer: C
Explanation:
Comprehensive and Detailed Explanation
The Prisma SD-WAN (CloudGenix) solution is designed with a separation of the control plane (Controller) and the data plane (ION devices).1 In the event that an ION device loses connectivity to the Cloud Controller (often referred to as running in "headless mode"), the device continues to forward traffic and maintain existing VPN tunnels using the keys it currently holds.2 However, for security purposes, the VPN session keys (shared secrets) used for the Secure Fabric have a finite validity period. The system is designed such that these keys are rotated regularly.3 If the controller is unreachable, the ION device can continue to rotate keys locally and maintain the VPNs for a maximum default period of 72 hours (exactly 3 days).4 If the connection to the controller is not restored within this 72-hour window, the keys will eventually expire, and the ION will be unable to retrieve new authorized key material from the controller.5 Consequently, the VPN tunnels will go down, and the "out of shared secret key" error will be observed in the VPN status logs. This mechanism ensures that a permanently compromised or stolen device cannot maintain network access indefinitely without central authorization.
NEW QUESTION # 22
What is the basis for calculating the minimum bandwidth subscription required for branch IONs?
Answer: D
Explanation:
Palo Alto Networks utilizes an aggregate throughput model for Prisma SD-WAN licensing.1 The minimum bandwidth subscription required for a branch ION is determined by the maximum traffic (the sum of both ingress and egress) that passes through the ION device. This is often referred to as "Aggregate Throughput." It is a critical distinction in the Prisma SD-WAN architecture because the license must account for all traffic processed by the device, whether that traffic stays local (Direct Internet Access), goes to the Data Center via the VPN fabric, or moves between local LAN segments.
When sizing a subscription, engineers must evaluate the total capacity of the WAN circuits connected to the branch. For example, if a branch has two 100 Mbps internet circuits, the device is capable of processing 200 Mbps of egress traffic and 200 Mbps of ingress traffic simultaneously. However, the licensing is based on the aggregate peak throughput the customer expects to utilize across the device's interfaces.
Choosing an under-sized subscription based only on "fabric traffic" (Option B) or "ISP capacity" (Option D) without considering the total bi-directional flow can lead to artificial performance bottlenecks. If the traffic exceeds the licensed bandwidth, the ION device will police the traffic to the licensed limit, regardless of the physical port speed or the hardware's theoretical maximum. Therefore, the subscription must be aligned with the total actual traffic volume the device is expected to handle to ensure an optimal user experience and full utilization of available circuit bandwidth.
NEW QUESTION # 23
How can a network administrator detect a site outage or a service-level agreement (SLA) violation using controller-generated incidents?
Answer: A
Explanation:
In the Prisma SD-WAN ecosystem, the centralized cloud controller provides a robust multi-layered visibility framework to ensure network reliability. To effectively detect critical events like site outages or application performance issues (SLA violations), the controller aggregates several types of operational data. Incidents are the primary mechanism for high-level alerting; they are automatically generated when the system detects significant state changes, such as an ION device going offline (site outage) or a path failing to meet the required performance metrics.
While Incidents provide the "what" and "where," Alerts offer granular notifications for specific events that may not yet have escalated to a full-scale incident. To provide deep context, the controller also utilizes Statistics, which include real-time and historical telemetry regarding bandwidth, latency, jitter, and packet loss. These statistics allow administrators to visualize the specific SLA violation as it occurs. Furthermore, Audit logs are essential for tracking configuration changes or administrative actions that might have preceded an outage, helping engineers correlate human intervention with network behavior.
By combining these four elements-Incidents for major events, Alerts for specific notifications, Statistics for performance validation, and Audit logs for change tracking-a network administrator gains a 360-degree view of the fabric. This comprehensive approach moves beyond simple "up/down" monitoring, allowing for
"Day 2" operational excellence where performance degradation is identified and remediated before it impacts the end-user experience.
NEW QUESTION # 24
An administrator needs to ensure that critical VoIP traffic is not dropped even when the branch's primary internet link is fully saturated with bulk file transfers.
Which QoS mechanism does Prisma SD-WAN automatically apply to the "Platinum" priority class to prevent starvation by lower-priority classes?
Answer: D
Explanation:
Comprehensive and Detailed Explanation
Prisma SD-WAN utilizes a hierarchical QoS model (typically based on Hierarchical Token Bucket or similar shaping algorithms) to manage bandwidth contention.
Guaranteed Bandwidth: The "Platinum" class (used for Real-Time voice/video) is assigned a guaranteed bandwidth percentage (floor) in the QoS profile. This ensures that even if "Gold" (Transactional) or "Silver" (Bulk) traffic is trying to consume 100% of the link, the scheduler reserves the specific portion (e.g., 30%) for Platinum traffic, preventing starvation.
Shaping, not Policing: Unlike simple policing which drops excess traffic hard, the ION device shapes the egress traffic. If the link is congested, the scheduler delays the lower-priority packets (buffering) to allow the high-priority Platinum packets to exit immediately.
Why not Strict Priority (A)? While Platinum behaves like a priority queue, pure Strict Priority can completely starve lower queues if the high-priority traffic is misbehaving or voluminous. Prisma SD-WAN typically uses bandwidth guarantees (floors) and limits (ceilings) to ensure fair sharing while protecting critical apps.
NEW QUESTION # 25
A network engineer is troubleshooting a "Voice Quality" issue. They suspect that the DSCP markings are being stripped or altered by the ISP.
Which tool in the Prisma SD-WAN portal allows the engineer to capture live packets on the WAN interface and inspect the IP header ToS/DSCP field?
Answer: A
Explanation:
Comprehensive and Detailed Explanation
To validate specific packet-level details like DSCP (Differentiated Services Code Point) values, header checksums, or exact payload sizes, a Packet Capture (PCAP) is required.
PCAP Tool: Prisma SD-WAN provides a built-in PCAP utility accessible directly from the portal. The engineer can select the specific Interface (e.g., Internet 1), apply a Filter (e.g., port 5060 or host 1.2.3.4), and capture the traffic.
Analysis: The resulting .pcap file can be downloaded and opened in Wireshark. This allows the engineer to definitively see if the packets leaving the ION have DSCP EF (46) and if the packets arriving (if capturing on the other side) still retain that marking, or if the ISP has bleached it to CS0 (0).
Flow Browser (A): While it shows "Application" and metrics, the Flow Browser typically displays the assigned priority class, not necessarily the raw bit-level DSCP value present in the packet header on the wire.
NEW QUESTION # 26
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