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質問 # 109
The alert shown in the exhibit is designed to detect which of the following network security issues?
正解：C
解説：
As shown in Exhibit 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 the Alert Conditions section, which specifies: BGP Origin meets all of: ASN not in 1234.
This specific configuration is the standard method used in ThousandEyes to detect BGP 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 is not the 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.
質問 # 110
What advantage does the integration of ThousandEyes with Cisco technologies offer for troubleshooting?
正解：C
解説：
TheDesigning and Implementing Enterprise Network Assurance (300-445 ENNA)certification emphasizes that the primary value proposition of the Cisco "Assurance Stack" is the reduction ofMean Time to Identification (MTTI)andMean Time to Resolution (MTTR). The integration of ThousandEyes across Cisco's portfolio-including Catalyst, Meraki, and SD-WAN-allows for quick identification and resolution of performance issues(Option D).12 By embedding ThousandEyes agents into the existing network infrastructure, Cisco enables "end-to-end visibility" that spans domains the enterprise traditionally does not control, such as the public internet and SaaS environments.13During troubleshooting, this cross-platform visibility allows network engineers to immediately correlate internal network health (from Catalyst Center or Meraki Dashboard) with external path visualization (from ThousandEyes). For example, when a user experiences poor video quality in a Webex meeting, the integration allows the engineer to "cross-launch" from the Webex Control Hub directly into a ThousandEyes path view.14This pinpoint accuracy avoids the "blame game" between network, application, and ISP teams by providing a "single source of truth" regarding where the packet loss or latency is occurring.
While some automation exists (Option C), the core benefit isn't automatic configuration changes based on feedback, but rather providing theactionable insightsrequired for manual or policy-based remediation.
Similarly, while it streamlines data gathering, its ultimate purpose is thespeed of resolutionin complex, hybrid environments.
質問 # 111
Employees and customers of a retail company are experiencing performance issues with the store website, such as slowness during the login process or failure when adding items to the cart. Which test type is the most useful for identifying the root cause of these problems?
正解：B
解説：
In theDesigning and Implementing Enterprise Network Assurance (300-445 ENNA)curriculum, selecting the appropriate test type is essential for isolating performance bottlenecks in complex web applications. When users report issues with specific multi-step workflows-such as logging into a portal or interacting with a shopping cart-theTransaction test type(Option C) is the most effective tool.
A Transaction test is a specialized Web-layer test that utilizes a script (typically written in JavaScript
/TypeScript) to mimic real user interactions with a website. Unlike a simpleHTTP Server test(Option A) that only checks for a 200 OK response from a single URL, or aPage Load test(Option B) that measures the rendering of a single page, a Transaction test follows a predefined user journey. For this retail scenario, the test can be configured to navigate to the homepage, enter credentials, click the login button, search for a product, and add it to the cart.
The primary advantage of this approach is that it provides granular, step-specific timing. It allows the engineer to identify precisely where the latency or failure occurs-for example, if the backend database takes too long to process the login or if an API call fails during the "add to cart" action. WhileAgent-to-server (Option D) andDNS Server(Option E) tests provide valuable network and infrastructure data, they cannot validate the functional logic of a web application.Agent-to-agent(Option F) is used for measuring throughput between two managed points and is irrelevant for public-facing website testing. Therefore, for troubleshooting interactive web processes, theTransaction test typeis the definitive choice for pinpointing the source of the issue.
質問 # 112
What key feature does Thousand Eyes WAN Insights offer for network optimization?
正解：C
解説：
WAN Insights offers predictive analytics to anticipate network issues and optimize performance proactively.
質問 # 113
Drag and Drop Question
An engineer configures an alert rule to trigger when an interface on a network switch goes down or when the amount of incoming traffic exceeds half the interface link speed. Drag and drop the options from the bottom onto the boxes in the alert rule configuration screen. Not all options are used.
正解：
解説：
Explanation:
Throughput (inbound) is the correct metric to measure traffic exceeding half of the interface capacity, and Operational Status = Offline is the correct trigger for detecting an interface down event.
質問 # 114
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