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| Section | Objectives |
|---|---|
| Automation and Data Interpretation | - Data-driven assurance workflows
|
| Monitoring and Telemetry Technologies | - Data collection mechanisms
|
| Enterprise Network Assurance Architecture | - Assurance concepts and methodologies
|
| Troubleshooting and Analysis | - Performance and fault analysis
|
| Assurance Platforms and Tools | - Cisco assurance platforms
|
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NEW QUESTION # 83
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: B
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 # 84
Carefully review the exhibits. Which detail indicates the network issue might be caused by a BGP Hijack?
Answer: C
Explanation:
In the Designing and Implementing Enterprise Network Assurance (300-445 ENNA) curriculum, identifying routing anomalies such as BGP Hijacking is a critical aspect of external network assurance. A BGP Hijack occurs when an Autonomous System (AS) illegitimately announces a prefix it does not own, causing traffic intended for the rightful owner to be misdirected.
By contrasting Exhibit 3.4-1 (Before the Outage) and Exhibit 3.4-2 (During the Outage), a definitive change in the routing path is observed. In the baseline view (Exhibit 3.4-1), traffic from the Los Angeles agent reaches the destination network 54.239.104.0/23, which is correctly associated with Amazon.com, Inc. (AS 16509). However, during the outage (Exhibit 3.4-2), the path visualization shows the traffic being redirected into a different network: eNET Inc. (AS
10297). At this new location, the traffic encounters 100% Forwarding Loss at the node ten7-
8.core-2.xlhost.com.
The change in the Autonomous System (AS) number from 16509 to 10297 (Option B) is the most concrete indicator of a BGP Hijack. While symptoms such as Availability Drop (Option A), Response Delay (Option C), and Packet Loss (Option D) are clearly visible in the ThousandEyes telemetry, these symptoms are generic and could be caused by various other issues like physical link failures or congestion. The shift in the AS path--specifically to an AS that does not legitimately host the target's IP prefix--provides the forensic evidence needed to identify the root cause as a routing takeover. This visualization allows network administrators to bypass internal troubleshooting and immediately focus on external remediation with upstream providers.
NEW QUESTION # 85
Which of the following metrics can be used to configure an alert rule for Endpoint Agent HTTP Server tests?
(Choose two)
Answer: A,D
Explanation:
In the ThousandEyes platform, alert rules are the primary mechanism for notifying operations teams when performance thresholds are breached. When configuring alerts for Endpoint Agent HTTP Server tests , the available metrics are limited to those that the Endpoint Agent captures during its synthetic browser-based or network-layer probes.
The two correct metrics for this test type are Response Time (Option A) and Error Type (Option C).
* Response Time: This metric measures the time-to-first-byte. It is essential for detecting degradations in web application performance as seen from the user ' s specific machine.
* Error Type: This allows administrators to trigger alerts based on specific HTTP response codes or protocol errors (e.g., DNS failures or SSL handshake issues).
Other options are incorrect because they apply to different agent types or monitoring layers:
* BGP Reachability (Option B): BGP metrics are not applicable to Endpoint Agent tests. These metrics require the BGP route visualization layer, which is typically associated with Cloud or Enterprise Agents monitoring public internet paths.
* Interface Throughput (Option D): This is an infrastructure-level metric rather than a synthetic application metric. While ThousandEyes can monitor device health via SNMP, it is not a metric used in a synthetic HTTP Server test.
By utilizing Response Time and Error Type, an architect can ensure that the operations team is alerted as soon as users experience slow loading or actual failures when accessing critical internal or SaaS-based web applications.
NEW QUESTION # 86
What is the primary function of DNS tests configured in network assurance tools?
Answer: B
Explanation:
The primary function of DNS tests configured in network assurance tools is to resolve domain names to IP addresses, simulate DNS queries and responses, and monitor DNS server performance to ensure domain name resolution reliability, identify DNS-related issues, and troubleshoot DNS resolution errors.
NEW QUESTION # 87
How can collected data in network assurance be used to diagnose VPN gateway issues?
Answer: C
Explanation:
Collected data can be used to diagnose VPN gateway issues by detecting connection failures and analyzing VPN tunnel performance in network assurance.
NEW QUESTION # 88
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