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Cisco Designing and Implementing Enterprise Network Assurance Sample Questions (Q25-Q30):

NEW QUESTION # 25
The alert shown in the exhibit is designed to detect which of the following network security issues?

Answer: A

Explanation:
As shown inExhibit 4.1-1(image_6e19fb.png), the alert rule is configured for the BGP layer with the name
"AS origin AS 1234". The critical logic is defined in theAlert Conditionssection, which specifies: BGP Origin meets all of: ASN not in 1234.
This specific configuration is the standard method used in ThousandEyes to detectBGP hijacking(Option C).
BGP hijacking occurs when an unauthorized Autonomous System (AS) announces a network prefix that it does not own, effectively stealing the traffic meant for the legitimate owner. By setting an alert that triggers when a monitored prefix is seen originating from an Autonomous System Number (ASN) that isnotthe expected authorized ASN (in this case, AS 1234), ThousandEyes provides immediate notification of a routing takeover.
Identifying this via BGP Origin alerts is superior to simple connectivity checks because it catches the issue at the routing control plane.
* DNS Issues (Options B and D):These involve the translation of names to IPs and would be detected via DNS-specific tests rather than BGP Origin checks.
* Route Poisoning (Option A):This is a generic term often referring to the manipulation of distance- vector protocol metrics to make a route unreachable; while related to routing, BGP Origin checks are the specific tool for detecting external prefix hijacks.
By monitoring the ASN origin, network engineers can quickly distinguish between a local ISP outage and a global security event where their traffic is being misdirected to an illegitimate network.


NEW QUESTION # 26
A network engineer deploys a ThousandEyes Docker agent on a switch using app-hosting. The agent needs to communicate through a proxy server, but this configuration was missed during the initial deployment. The engineer adds the proxy settings to the app-hosting configuration. What is the next step to ensure the agent uses the proxy and appears online in the ThousandEyes portal?

Answer: D

Explanation:
In theDesigning and Implementing Enterprise Network Assurance (300-445 ENNA)implementation guide, the Cisco IOS XEApplication Hostinglifecycle 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 theConfiguredstate 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 andinjects the new configuration parameters(including the updated proxy settings) into the container's environment.
* Start:Initiates the container with the newly applied configuration.
Without thedeactivate/activatesequence, 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, whileNo action(Option D) will result in no change to the agent's connectivity status.


NEW QUESTION # 27
Which tests can be configured using Thousand Eyes for network assurance purposes?

Answer: B,C,E

Explanation:
Thousand Eyes can be configured for various tests, including network tests, voice tests, and web tests, enabling comprehensive network assurance and performance monitoring across different domains.


NEW QUESTION # 28
What is the primary purpose of configuring synthetic web tests in network assurance?

Answer: D

Explanation:
The primary purpose of configuring synthetic web tests is to simulate user interactions with web applications, such as browsing, form submissions, and transactions, to assess application performance, functionality, and responsiveness from an end-user perspective.


NEW QUESTION # 29
Refer to the exhibit.

Which integration type should be configured between ThousandEyes and Grafana?

Answer: A

Explanation:
In theDesigning and Implementing Enterprise Network Assurance (300-445 ENNA)curriculum, the evolution of network monitoring includes moving from periodic polling to real-time data streaming. The exhibit displays a curl command targeting the ThousandEyes API v7 /stream endpoint. When integrating ThousandEyes with high-performance observability platforms likeGrafana, the standardized and recommended method for machine-to-machine data exchange is throughOpenTelemetry (OTel).
According to the ENNA architecture guidelines, the ThousandEyesStreaming APIallows users to push granular test metrics (such as network latency, packet loss, and jitter) to external collectors in an OTel- compatible format. In the provided JSON payload, the "type" field is a mandatory parameter that defines the integration protocol. For Grafana, which natively supports OpenTelemetry Protocol (OTLP) via its OpenTelemetry Collector, the value must be set to"opentelemetry"(Option A). This tells the ThousandEyes streaming engine to encapsulate the data according to the OTel semantic conventions, ensuring that Grafana can correctly interpret and visualize the metrics without additional custom parsing logic.
While other options exist in the ThousandEyes ecosystem, they do not fit the specific API call shown for this use case:
* Custom Webhooks(Option B) are typically used for event-driven alerts and notifications (e.g., sending a POST request when a threshold is breached) rather than continuous high-fidelity metric streaming.
* Push-apiandpoll-api(Options C and D) are not valid "type" values within the context of the v7 /stream endpoint, as the streaming service specifically utilizes the OpenTelemetry framework for real-time delivery.
By selectingopentelemetry, the network engineer enables a robust "push-based" integration that provides real- time visibility into application performance and network health, leveraging Grafana's advanced dashboarding capabilities to analyze ThousandEyes telemetry data alongside other enterprise infrastructure metrics.
Introduction to ThousandEyes for OpenTelemetry
This video provides a foundational understanding of how ThousandEyes uses modern streaming frameworks to export critical performance data to external observability platforms.


NEW QUESTION # 30
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