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NEW QUESTION # 77
1000 branches are to be deployed on Prisma SD-WAN with the following constraints:
* Devices will be shipped in batches directly to the site
* Configuration Management Database (CMDB) has all the necessary details for a site deployment
* Field tech will be responsible for rack, stack, and cabling of the IONs at each site
* Field tech will need to spend minimum amount of time at each branch site to reduce the cost
* The NOC operates in shifts and is responsible for remote cutover support Which method will achieve the mass deployment in shortest possible time?
Answer: D
Explanation:
For a massive rollout involving 1,000 branch sites, Prisma SD-WAN (formerly CloudGenix) provides a specialized workflow known as Bulk Site Configuration. This method is designed to minimize manual intervention and maximize deployment velocity by leveraging Site Templates and Device Shells.
In this scenario, the primary architectural advantage of Option C is the use of Pre-Staging. By exporting an empty SD-WAN device CSV from the Prisma SD-WAN Controller and populating it with data from the corporate CMDB, administrators can perform a bulk upload to create hundreds or thousands of sites and device shells simultaneously in the management portal. A "Device Shell" acts as a placeholder for a physical ION device that has not yet connected to the cloud. It contains all the site-specific configuration-such as interface roles, circuit labels, and IP addressing-waiting for a serial number to be associated with it.
When the field technician performs the physical "rack and stack," they simply connect the ION device to the internet (via ISP modem or cellular). Through Zero Touch Provisioning (ZTP), the device automatically
"phones home" to the Prisma SD-WAN Cloud Controller using its Manufacturer Installed Certificate (MIC).
Because the configuration was pre-created via the CSV bulk upload, the controller recognizes the device (once assigned to its shell) and immediately pushes the complete configuration. This eliminates the need for the field tech to access a console port or perform local configuration, reducing their on-site time to the bare minimum. While APIs (Option D) can be used for automation, the built-in CSV template workflow is the standard, documented "best practice" for rapidly translating CMDB data into a functioning SD-WAN fabric at this scale.
NEW QUESTION # 78
A remote branch site is reporting intermittent connectivity to the Data Center. The administrator checks the System > Alarms page and sees a "VPN_DOWN" alarm for the tunnel to the DC. However, the internet circuit status is "Up".
Which specific log file or diagnostic tool in the Prisma SD-WAN portal would provide the IKE (Internet Key Exchange) error codes (e.g., "NO_PROPOSAL_CHOSEN" or "AUTH_FAILED") to pinpoint the cause of the tunnel failure?
Answer: D
Explanation:
Comprehensive and Detailed Explanation
To diagnose specific VPN negotiation failures (Phase 1 or Phase 2 IPSec issues), the Event Logs (specifically filtered for System or VPN events) are the correct resource.
Event Logs: This section records the control plane signaling messages. If a VPN tunnel fails to establish, the Event Log will generate an entry containing the specific IKE failure reason sent by the peer or generated locally. Common errors found here include INVALID_COOKIE, NO_PROPOSAL_CHOSEN (mismatch in encryption algorithms), or PRE_SHARED_KEY_MISMATCH.
Flow Browser (A): This shows user traffic (TCP/UDP sessions). If the VPN is down, user traffic won't even enter the tunnel, so the Flow Browser will just show dropped flows or blackholes, but it won't explain why the tunnel itself is broken.
Link Quality (D): This shows latency/loss graphs for established tunnels. It cannot diagnose why a tunnel failed to form in the first place.
NEW QUESTION # 79
Which implementation allows Prisma SD-WAN to improve application performance for organizations facing inconsistent user experiences across branch locations, especially due to varying device types and network conditions, by using Layer 4 and Layer 7 optimization to boost throughput?
Answer: A
Explanation:
Prisma SD-WAN addresses inconsistent application performance through Application Acceleration, which encompasses a suite of features designed to mitigate the effects of latency and packet loss.1 While basic SD- WAN functionality handles path selection, Application Acceleration goes further by employing Layer 4 (TCP) and Layer 7 (Application) optimizations. These optimizations are particularly effective for organizations with diverse branch environments where network conditions are unpredictable.
At Layer 4, Prisma SD-WAN implements TCP optimization techniques such as window scaling, selective acknowledgments, and congestion control algorithms.2 These mechanisms allow the ION devices to "trick" the end hosts into sending data faster by acknowledging packets locally, effectively shielding the application from the round-trip time (RTT) delays inherent in long-distance WAN circuits. This significantly boosts throughput for bulk data transfers and legacy protocols that were not originally designed for high-latency environments.
At Layer 7, the system can perform application-specific optimizations, such as metadata caching or protocol- specific acceleration for services like SMB or HTTP.3 By reducing the number of "chatty" exchanges required to complete a transaction, Prisma SD-WAN ensures a snappy, consistent user experience regardless of whether the user is on a high-speed fiber link or a degraded cellular connection. This is distinct from Forward Error Correction (FEC) (Option C) or Packet Duplication (Option A), which focus on reconstructing lost packets rather than optimizing the protocol throughput itself. By combining these L4 and L7 techniques, Application Acceleration ensures that business-critical SaaS and data center applications perform optimally across the entire distributed enterprise.
NEW QUESTION # 80
What is the basis for calculating the minimum bandwidth subscription required for branch IONs?
Answer: C
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 # 81
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: C
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 # 82
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