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NEW QUESTION # 30
Exhibit:
An engineer works to optimize a website by reducing the page-load time to below 500 ms. The engineer set up a Cisco ThousandEyes page-load test to baseline the current website performance. Which action should be recommended to reduce page-load time?
Answer: C
Explanation:
In the context ofDesigning and Implementing Enterprise Network Assurance (300-445 ENNA), analyzing page-load metrics within Cisco ThousandEyes requires identifying the primary bottlenecks that contribute to theTotal Page Load Time. The provided screenshot displays a "Page Breakdown" of 7 resources totaling 953 kB. A critical observation of the pie chart reveals thatImages(the teal-colored segment) constitute the vast majority of the page's payload and resource count.
When the goal is to reduce the page-load time from1023 msto below500 ms, the engineer must target the heaviest components.Lazy loadingis a design pattern that defers the initialization of non-critical resources at page load time. Instead of loading all images simultaneously when the userfirst navigates to the URL, lazy loading ensures that images are only downloaded as they are about to enter the viewport. This significantly reduces the initial DOM load time and the total Page Load Time because the browser does not have to wait for large image files to be fully retrieved before declaring the page "loaded." Alternative options are less effective in this specific scenario based on the data:
* AJAX (XHR/Fetch):The chart shows that XHR and Fetch resources represent a negligible sliver of the total weight; optimizing them would yield minimal gains.
* Moving IMG elements:While moving scripts to the bottom can help with rendering, moving image elements to the bottom of the body does not stop the browser from initiating the download requests immediately, thus failing to significantly reduce the total load time.
* CDN for Fonts:The "Font" category is also a small fraction of the total 953 kB. While a CDN is a best practice for latency, it does not address the primary "weight" issue caused by the images.
Therefore, implementinglazy loading(Option C) is the most impactful recommendation. It directly addresses the largest resource consumer (Images) identified in the ThousandEyes Page Breakdown, allowing the engineer to reach the sub-500 ms performance target.
NEW QUESTION # 31
What type of network issue can cause intermittent connectivity problems for end devices?
Answer: B
Explanation:
Routing errors can cause intermittent connectivity problems for end devices by disrupting the flow of network traffic between different network segments.
NEW QUESTION # 32
How does topology optimization contribute to network capacity planning?
Answer: C
Explanation:
Topology optimization contributes to network capacity planning by maximizing network efficiency, improving data flow, and reducing network latency.
NEW QUESTION # 33
Refer to the exhibit. A network engineer is tasked with configuring an alert that will trigger if the HTTP server responds with a server error. What alert conditions should be configured to meet the specified requirements?
Answer: A
Explanation:
In the Designing and Implement7ing Enterpr8ise 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).
NEW QUESTION # 34
You are investigating intermittent failures in a ThousandEyes transaction test targeting a web application that uses Basic Authentication. The failures occur randomly across different agents and times of day. What steps would you take to troubleshoot and resolve the issue? (Select all that apply)
Answer: A,B,D
Explanation:
Troubleshooting intermittent performance issues is a core component of theDesigning and Implementing Enterprise Network Assurance (300-445 ENNA)curriculum. When a transaction test using Basic Authentication fails randomly, the engineer must employ a multi-layered diagnostic approach to determine if the fault lies with the credentials, the network path, or the application server.
The first step is toverify the correctness of credentials(Option B). Because Basic Authentication encodes credentials in the header, any change in user permissions or account lockouts will trigger immediate failures.
Performing manual logins from various geographical locations helps rule out location-based access control lists (ACLs) or regional IdP sync issues.
The most data-rich diagnostic step is toanalyze the ThousandEyes waterfall charts and HTTP response codes(Option C). The waterfall view allows the engineer to see if the failure happens during the initial 401 Unauthorized challenge or after the credentials are sent. If the charts show high "Wait Time" or 5xx errors, the issue is likely server-side latency or instability. If the "Connect Time" is high, the problem may be network-layer congestion.
Finally, if the telemetry indicates that the network path is healthy but the server is intermittently returning errors or timing out, the engineer shouldcontact the web application vendor(Option D). Providing the vendor with the specific ThousandEyes "Share Link" allows them to see the exact same packet-level and browser-level data, proving that the issue is not with the client's network but with the server-side infrastructure. Disabling authentication (Option A) is not a valid troubleshooting step for a test designed specifically to monitor an authenticated workflow.
NEW QUESTION # 35
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