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>> Valid SD-WAN-Engineer Test Syllabus <<
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NEW QUESTION # 40
A network engineer is troubleshooting an ION device that is showing as "Offline" in the Prisma SD-WAN portal, despite the site reporting that local internet access is working. The engineer has console access to the device.
Which CLI command should be used to specifically validate the device's ability to resolve the controller's hostname and establish a secure connection to it over a specific interface?
Answer: C
Explanation:
Comprehensive and Detailed Explanation
The CLI command debug controller reachability <interface> (e.g., debug controller reachability 1) is the specific diagnostic tool designed to verify the entire connectivity chain required for management plane availability.
Unlike a simple ICMP ping (Option A), which only tests Layer 3 connectivity to an IP address, the debug controller reachability command performs a sequential set of tests:
DNS Resolution: It attempts to resolve the specific Locator service URL (locator.cgnx.net or region-specific FQDN) to verify DNS functionality.
TCP Connectivity: It tests the ability to establish a TCP connection to the controller on port 443 (HTTPS).
SSL/TLS Handshake: It validates that the device can successfully negotiate the secure tunnel required for authentication.
If this command fails at the DNS step, the issue is likely a missing DNS server in the interface config. If it fails at the TCP step, it implies an upstream firewall is blocking outbound port 443. This targeted output allows the engineer to pinpoint exactly why the device is offline in the portal.
NEW QUESTION # 41
Which metrics can be monitored at the individual Prisma SD-WAN ION device level to assess its health and operational performance?
Answer: A
Explanation:
To ensure the stability and performance of the SD-WAN fabric, Prisma SD-WAN provides granular visibility into the health of each Instant-On Network (ION) appliance. While the solution is primarily application- defined, monitoring the underlying physical and system resources of the hardware or virtual instance is critical for proactive maintenance and troubleshooting.
At the individual device level, administrators can monitor system resource utilization, which includes CPU usage, memory (RAM) consumption, and disk space availability.1 High CPU or memory usage can indicate that the device is reaching its throughput limits or that a specific process (such as deep packet inspection) is overtaxing the system. Disk utilization is monitored to ensure there is sufficient space for local logs and system operations.
Beyond internal system health, interface-level metrics are essential. This includes monitoring interface bandwidth utilization to identify bottlenecks on WAN or LAN ports. Crucially, operational performance is also assessed through error and discard counters on each interface. High error rates or frequent packet discards often signal physical layer issues (like bad cabling), duplex mismatches, or upstream provider congestion. While VPN status and application flows are vital for network-wide visibility, the core health of an ION device is defined by these foundational system and interface metrics.
Monitoring these specific parameters allows network engineers to distinguish between an application performance issue caused by network latency and one caused by a local hardware resource constraint.
NEW QUESTION # 42
What does Prisma SD-WAN use for monitoring and operations to deliver flow data and application visibility?
Answer: B
Explanation:
Prisma SD-WAN is built on an application-defined fabric that prioritizes deep visibility into network traffic and application performance.1 To deliver the high-fidelity flow data and application visibility required for modern operations, Prisma SD-WAN utilizes IPFIX (Internet Protocol Flow Information Export).2 IPFIX is a standardized protocol based on NetFlow v9 that allows for the export of IP flow information from network devices to a collector or management system.3 In the Prisma SD-WAN architecture, ION devices act as the exporters.4 Because the system is application- aware, it doesn't just export basic 5-tuple information (source/destination IP, ports, and protocol); it exports rich metadata including application IDs, performance metrics (latency, jitter, packet loss), and path information. This allows the Prisma SD-WAN Controller and the associated Analytics engine to reconstruct a complete picture of every flow in the network.
While other protocols like SNMPv3 are supported for basic device health monitoring (such as CPU or interface status) and ADEM (Autonomous Digital Experience Management) provides end-to-end visibility for mobile users or SASE-connected branches, IPFIX is the primary "engine" for flow-level data across the SD-WAN fabric. Unlike traditional IP SLA, which relies on synthetic probes, the IPFIX-based monitoring in Prisma SD-WAN uses real-time application traffic to assess performance. This ensures that the visibility provided in the Flow Browser and Analytics dashboards accurately reflects the actual user experience, enabling granular troubleshooting and proactive capacity planning.
NEW QUESTION # 43
In the Prisma SD-WAN portal, an administrator is viewing the "Media" analytics for a branch site to troubleshoot complaints about poor voice quality.
When calculating the Mean Opinion Score (MOS) for voice traffic, which two metrics does the system prioritize active monitoring for, even when no user voice traffic is present on the link? (Choose two.)
Answer: A,C
Explanation:
Comprehensive and Detailed Explanation
Prisma SD-WAN calculates the Mean Opinion Score (MOS) to provide a standardized metric (1-5) for voice quality. To ensure the system always knows the "voice readiness" of a path-even before a call starts-it uses Active Probes (synthetic UDP packets).
While latency is measured, the MOS calculation algorithm is most heavily penalized by Packet Loss (D) and Jitter (B).
Packet Loss: Even a small amount of loss (e.g., >1%) dramatically reduces voice clarity, causing dropouts.
Jitter: High variance in packet arrival time (jitter) causes the "robotic" voice effect and buffer underruns.
The system continuously measures these specific metrics on all WAN links using synthetic probes. If the packet loss or jitter exceeds the threshold defined in the "Path Quality Profile" (e.g., Voice Profile), the path is marked as non-compliant, and the MOS score drops, triggering a policy action to move the flow. Throughput (C) is less critical for voice as calls consume very little bandwidth (e.g., 64-100 Kbps), making congestion (loss/jitter) the primary enemy, not raw speed.
NEW QUESTION # 44
An administrator has configured a Path Policy for "ERP_Traffic". The policy allows two public internet links,
"ISP-A" and "ISP-B", both marked as "Active". The Path Quality Profile (SLA) requires a latency of less than
150ms. Currently, both ISP-A and ISP-B have a latency of 40ms, well within the SLA.
How does the Prisma SD-WAN ION determine which link to use for a new flow of "ERP_Traffic" when both active paths meet the SLA requirements?
Answer: B
Explanation:
Comprehensive and Detailed Explanation
Prisma SD-WAN utilizes a sophisticated decision engine for Application-Based Path Selection that goes beyond simple failover. When configuring a Path Policy, the administrator defines "Active" paths and a "Path Quality Profile" (SLA).
* SLA Compliance (The Filter): First, the system filters the available paths based on the Path Quality Profile. In this scenario, both ISP-A and ISP-B have 40ms latency against a 150ms threshold. Both are
"green" or compliant paths.
* Selection Criteria (The Tie-Breaker): When multiple paths are configured as "Active" and all meet the performance SLA, the ION device aims to optimize the overall user experience and network utilization. The default behavior for load balancing across healthy, compliant active paths is to select the path with the highest available bandwidth capacity.
By steering new flows to the link with the most "headroom" (available Mbps), the system prevents the saturation of a smaller link (e.g., a 20Mbps DSL line) while a larger link (e.g., 1Gbps Fiber) sits underutilized.
This maximizes the aggregate throughput for the site. While latency is the qualifier, bandwidth availability is often the selector for compliant paths. Note that if the application was defined as "Real-Time" and configured for packet duplication, behavior would differ, but for standard traffic, capacity-based distribution is the standard active/active logic.
NEW QUESTION # 45
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