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Test application flows hit the intended rule and shift on controlled SLA degradation. This would verify resolution of a different case: An application has a latency SLA but the SD-WAN profile monitors the wrong app category, and no measured degradation causes path change. It does not show that the reported issue was fixed or that its intended action—Configure the appropriate SD-WAN routing and tunnel dependencies for the selected path.—worked.

Ordinary uploads stay on low-cost transport while critical traffic can use cellular during verified outage. This would verify resolution of a different case: A backup cellular path has a strict data quota but the traffic distribution rule treats it as an equal active link for routine video uploads. It does not show that the reported issue was fixed or that its intended action—Configure the appropriate SD-WAN routing and tunnel dependencies for the selected path.—worked.

Test load allocation stays within revised capacity while priority apps remain stable. This would verify resolution of a different case: A transport change updates one path's assigned bandwidth but SD-WAN policy still selects it for a larger load than the link can carry. It does not show that the reported issue was fixed or that its intended action—Configure the appropriate SD-WAN routing and tunnel dependencies for the selected path.—worked.

An individual quality metric can exceed its threshold without other metrics failing. This mechanism instead explains a separate problem: A branch health monitor shows packet loss rising above the configured SLA but an engineer expects automatic reroute only when latency and jitter also exceed limits. The current incident requires the more directly applicable cause stated by the correct option.

Aggressive distribution without session awareness can disrupt stateful applications. This mechanism instead explains a separate problem: A company selects symmetric flow distribution for a transactional app but uses indiscriminate per-packet traffic distribution across disparate Internet links. The current incident requires the more directly applicable cause stated by the correct option.

Aggregation or sensitivity may conceal user-visible short quality degradations. This mechanism instead explains a separate problem: A call-center SD-WAN rule uses a latency SLA based on average hourly measurements and ignores short bursts of harmful jitter. The current incident requires the more directly applicable cause stated by the correct option.

Validate per-application jitter and loss thresholds before SD-WAN cutover. That safeguard addresses another potential failure: An SD-WAN branch voice rule uses a generic path quality threshold suitable for large file transfers, allowing jitter that breaks live calls. It is not the most targeted recurring control for the described cause: A route preference does not create the underlying tunnel and security path.

Compare path measurements with actual call experience for SLA tuning. That safeguard addresses another potential failure: A call-center SD-WAN rule uses a latency SLA based on average hourly measurements and ignores short bursts of harmful jitter. It is not the most targeted recurring control for the described cause: A route preference does not create the underlying tunnel and security path.

Audit forced-path exceptions against live SLA measurements. That safeguard addresses another potential failure: A branch has a high-quality private link and degraded broadband link, but a hard-coded app route forces voice over broadband despite better available private connectivity. It is not the most targeted recurring control for the described cause: A route preference does not create the underlying tunnel and security path.

Configure appropriate application-specific loss, latency and jitter thresholds in the SD-WAN Path Quality profile. That could address a different issue in the same blueprint area: A branch voice application fails during high jitter on the primary WAN link because its path-quality profile evaluates latency only. It does not directly correct the given incident, whose decisive mechanism is: An interface-up state does not establish acceptable application path performance.

Set a supported traffic distribution policy aligned to bandwidth and business priorities, reserving backup use as appropriate. That could address a different issue in the same blueprint area: An SD-WAN traffic distribution policy round-robins traffic over paths of unequal capacity and overloads a small LTE backup link. It does not directly correct the given incident, whose decisive mechanism is: An interface-up state does not establish acceptable application path performance.

Allow the supported health-probe path and verify probe destinations through each transport. That could address a different issue in the same blueprint area: A site enables new SD-WAN path steering but omits probe reachability through its edge firewall and incorrectly flags every backup path as failed. It does not directly correct the given incident, whose decisive mechanism is: An interface-up state does not establish acceptable application path performance.

A controlled loss-only impairment produces the configured path selection without needing concurrent jitter or latency degradation. This would verify resolution of a different case: A voice path changes even when only packet loss exceeds its threshold, but an engineer expects all three SLA metrics to fail before failover. It does not show that the reported issue was fixed or that its intended action—Enable appropriate path-health measurement and quality profiles for the protected application.—worked.

The primary carries expected load and the LTE link stays within its approved utilization. This would verify resolution of a different case: An SD-WAN traffic distribution policy round-robins traffic over paths of unequal capacity and overloads a small LTE backup link. It does not show that the reported issue was fixed or that its intended action—Enable appropriate path-health measurement and quality profiles for the protected application.—worked.

A controlled latency degradation produces the expected qualified path selection without oscillation. This would verify resolution of a different case: A primary circuit has intermittent latency spikes but an SD-WAN quality profile uses an overly insensitive threshold that never triggers. It does not show that the reported issue was fixed or that its intended action—Enable appropriate path-health measurement and quality profiles for the protected application.—worked.

Path measurement requires reachable probes and coherent transport policy. This mechanism instead explains a separate problem: A site enables new SD-WAN path steering but omits probe reachability through its edge firewall and incorrectly flags every backup path as failed. The current incident requires the more directly applicable cause stated by the correct option.

Path-quality thresholds can treat any single breached metric as a disqualifier. This mechanism instead explains a separate problem: A voice path changes even when only packet loss exceeds its threshold, but an engineer expects all three SLA metrics to fail before failover. The current incident requires the more directly applicable cause stated by the correct option.

Policy references must resolve within applicable management scope and inheritance. This mechanism instead explains a separate problem: An SD-WAN rule refers to a Path Quality profile that was created in a different folder and is unavailable to the branch firewall. The current incident requires the more directly applicable cause stated by the correct option.

Validate effective SD-WAN object visibility at each destination folder. That safeguard addresses another potential failure: An SD-WAN rule refers to a Path Quality profile that was created in a different folder and is unavailable to the branch firewall. It is not the most targeted recurring control for the described cause: An interface-up state does not establish acceptable application path performance.

Document and test individual SLA breach behavior before deployment. That safeguard addresses another potential failure: A voice path changes even when only packet loss exceeds its threshold, but an engineer expects all three SLA metrics to fail before failover. It is not the most targeted recurring control for the described cause: An interface-up state does not establish acceptable application path performance.

Include target-device effective configuration confirmation after SD-WAN changes. That safeguard addresses another potential failure: A cloud-managed SD-WAN template changes a branch's interface role but was never pushed to the target firewall. It is not the most targeted recurring control for the described cause: An interface-up state does not establish acceptable application path performance.

Configure the appropriate SD-WAN routing and tunnel dependencies for the selected path. That could address a different issue in the same blueprint area: A site enables SD-WAN tunnel path switching but the selected tunnel interface is missing the required routing/security configuration. It does not directly correct the given incident, whose decisive mechanism is: Aggregation or sensitivity may conceal user-visible short quality degradations.

Review SD-WAN rule match order, preferred path list and quality criteria for the voice application. That could address a different issue in the same blueprint area: A branch has a high-quality private link and degraded broadband link, but a hard-coded app route forces voice over broadband despite better available private connectivity. It does not directly correct the given incident, whose decisive mechanism is: Aggregation or sensitivity may conceal user-visible short quality degradations.

Configure supported session-consistent traffic distribution to preserve the business app's path expectations. That could address a different issue in the same blueprint area: A company selects symmetric flow distribution for a transactional app but uses indiscriminate per-packet traffic distribution across disparate Internet links. It does not directly correct the given incident, whose decisive mechanism is: Aggregation or sensitivity may conceal user-visible short quality degradations.

Both paths measure realistically and failover selects the healthy alternative. This would verify resolution of a different case: A branch’s configured SD-WAN SLA uses probe targets reachable only over its primary provider, so the backup is reported degraded even when healthy. It does not show that the reported issue was fixed or that its intended action—Tune supported sensitivity and observation settings to match the user's required service quality.—worked.

Simulated jitter above the target causes selection of another eligible path with improved call stability. This would verify resolution of a different case: An SD-WAN branch voice rule uses a generic path quality threshold suitable for large file transfers, allowing jitter that breaks live calls. It does not show that the reported issue was fixed or that its intended action—Tune supported sensitivity and observation settings to match the user's required service quality.—worked.

Ordinary uploads stay on low-cost transport while critical traffic can use cellular during verified outage. This would verify resolution of a different case: A backup cellular path has a strict data quota but the traffic distribution rule treats it as an equal active link for routine video uploads. It does not show that the reported issue was fixed or that its intended action—Tune supported sensitivity and observation settings to match the user's required service quality.—worked.

An up interface can still carry an unusable application path. This mechanism instead explains a separate problem: An administrator configures SD-WAN path quality for business collaboration but ignores one-way packet loss on an underlay that appears operational. The current incident requires the more directly applicable cause stated by the correct option.

A route preference does not create the underlying tunnel and security path. This mechanism instead explains a separate problem: A site enables SD-WAN tunnel path switching but the selected tunnel interface is missing the required routing/security configuration. The current incident requires the more directly applicable cause stated by the correct option.

SD-WAN path selection does not automatically repair mismatched NAT identity. This mechanism instead explains a separate problem: During an ISP outage drill, an SD-WAN rule fails over but its source NAT still uses the unavailable provider address and the application's return traffic disappears. The current incident requires the more directly applicable cause stated by the correct option.

Validate per-application jitter and loss thresholds before SD-WAN cutover. That safeguard addresses another potential failure: An SD-WAN branch voice rule uses a generic path quality threshold suitable for large file transfers, allowing jitter that breaks live calls. It is not the most targeted recurring control for the described cause: Aggregation or sensitivity may conceal user-visible short quality degradations.

Validate tunnels, NAT, routing and SD-WAN policy jointly during deployment. That safeguard addresses another potential failure: A site enables SD-WAN tunnel path switching but the selected tunnel interface is missing the required routing/security configuration. It is not the most targeted recurring control for the described cause: Aggregation or sensitivity may conceal user-visible short quality degradations.

Verify probe reachability and target selection on every provider. That safeguard addresses another potential failure: A branch’s configured SD-WAN SLA uses probe targets reachable only over its primary provider, so the backup is reported degraded even when healthy. It is not the most targeted recurring control for the described cause: Aggregation or sensitivity may conceal user-visible short quality degradations.