300-445 Exam Dumps - Designing and Implementing Enterprise Network Assurance (300-445 ENNA)

In the Designing and Implementing Enterprise Network Assurance (300-445 ENNA) implementation guide, the Cisco IOS XE Application Hosting lifecycle is a critical concept for troubleshooting and configuration management. When an application environment variable—such as proxy settings—is modified in the app-hosting configuration, a simple restart of the container is insufficient.

The correct procedure involves moving the application back to the Configured state before bringing it back to Running . This requires a four-step lifecycle execution (Option C):

Stop: Terminates the current running instance of the container.

Deactivate: Releases the hardware resources (CPU, Memory, Virtual Interfaces) and, crucially, detaches the previous runtime configuration.

Activate: Re-allocates the resources and injects the new configuration parameters (including the updated proxy settings) into the container ' s environment.

Start: Initiates the container with the newly applied configuration.

Without the deactivate/activate sequence, the container will continue to use the environment variables present at the time of its initial activation, causing the agent to remain offline as it fails to reach the ThousandEyes portal without the proxy. Reinstalling (Option B) is an unnecessary and time-consuming step that involves re-downloading or re-copying the image, while No action (Option D) will result in no change to the agent ' s connectivity status.

The Designing and Implementing Enterprise Network Assurance (300-445 ENNA) framework emphasizes that the goal of internet intelligence is to enable rapid and accurate escalation to the party responsible for a service degradation. Based on the evidence of a BGP Hijack identified in the previous question, the issue is occurring entirely within the public internet ecosystem.

The most appropriate next step is to reach out to the Internet Service Provider (ISP) to report the suspected BGP hijacking incident (Option B). Since the traffic is being misdirected by an external Autonomous System (AS 10297) before it reaches the intended destination (AS 16509), the fix must occur at the routing policy level of the major transit providers. The network administrator should provide the ISP with the ThousandEyes " Share Link " or screenshots showing the path change and the unauthorized AS announcement, as this data serves as proof to accelerate the ISP ' s mitigation efforts, such as implementing prefix filters or contacting the offending network.

Other options are ineffective for this specific scenario:

Option A: The path visualization shows that traffic is successfully leaving the local network and reaching the public internet; the problem is many hops away from the internal routers.

Option C: Blocking traffic from AS 10297 does not solve the problem of your traffic being attracted to it. The hijack affects how the rest of the world (including your ISP) sees the route to your destination.

Option D: DNS is not the issue; the agent successfully resolved the hostname to the correct IP, but the BGP layer misdirected the packets at the routing level.

By identifying the issue as an external routing event, the administrator avoids wasting internal resources and directly triggers the necessary external remediation.

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In the Designing and Implement 7 ing Enterpr 8 ise Network Assurance (300-445 ENNA) framework, configuring effective alert rules is critical for distinguishing between standard network noise and actionable application-layer failures. For Web - HTTP Server tests, ThousandEyes allows engineers to monitor both network-level metrics (like Connect time) and application-level indicators (like HTTP response codes).

The requirement is to trigger an alert specifically when the HTTP server responds with a server error . In the HTTP protocol, server errors are categorized as the 5XX series of status codes (e.g., 500 Internal Server Error, 503 Service Unavailable, 504 Gateway Timeout). To meet this requirement, the engineer must configure a location alert condition where the Metric is set to Response Code and the condition value is server error(5XX) (Option D).

Reviewing the other options:

Error type is any (Option A): While this would capture server errors, it would also trigger for 4XX client errors (like 404 Not Found) and network-layer timeouts, making it too broad for a specific " server error " requirement.

Wait Time is Dynamic (Option B): This monitors the time-to-first-byte using statistical baselining. While high wait times often precede 5XX errors, this condition only alerts on latency, not on the actual error code itself.

Response Time (Option C): Similar to wait time, this monitors performance speed rather than the logical success or failure of the server ' s response.

By specifically selecting Response Code: server error(5XX) , the engineer ensures that the operations team is only notified when the application backend is experiencing a functional failure, rather than just a slow response or a client-side misconfiguration.

The architecture for Designing and Implementing Enterprise Network Assurance (300-445 ENNA) specifies that ThousandEyes WAN Insights relies on deep integration with the Cisco SD-WAN management stack. To generate its predictive path recommendations, the platform must ingest specific telemetry data that reflects both the network ' s behavior and the applications traversing it.

The first essential data source is historical network performance metrics collected by vAnalytics (Option B). Before WAN Insights can be activated, vAnalytics must be enabled to collect and enrich raw network telemetry from the edge routers. 34 This data includes granular metrics for every SD-WAN tunnel, such as packet loss, latency, and jitter. 35 WAN Insights analyzes these historical trends to forecast future path quality and determine which transport circuits are most likely to meet application SLAs over a long-term period.

The second essential data source is application traffic flow data (Option D). WAN Insights must understand which applications are currently active in the fabric to prioritize recommendations for " business-critical " services like Office 365, Webex, or custom internal apps. 38 This information is ingested as flow records from the SD-WAN data plane and categorized based on the Application Lists defined in Cisco Catalyst SD-WAN Manager (vManage) .

Options A and E are configuration or logging data that, while useful for general management, are not the raw telemetry inputs used by the WAN Insights predictive engine. Option C is incorrect because WAN Insights explicitly uses infrastructure telemetry rather than ThousandEyes agent-based synthetic data for its SD-WAN fabric calculations. By combining vAnalytics performance metrics and application flow data , WAN Insights can provide the " Predictive Path Recommendatio 41 ns " that are a hallmark of modern network assurance.