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NEW QUESTION # 70
The alert shown in the exhibit is designed to detect which of the following network security issues?
Answer: D
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 # 71
To monitor communication and measure network performance from branch offices in San Francisco and Texas to the data center in North Virginia, which combination of test type and target is the most appropriate?
Answer: C
Explanation:
According to theDesigning and Implementing Enterprise Network Assurance (300-445 ENNA) architecture, monitoring site-to-site connectivity between managed locations requires vantage points at both ends of the connection. In this scenario, the organization needs to measure performance between branch offices (San Francisco and Texas) and a central data center (North Virginia).
The most appropriate combination is usingEnterprise Agentswith theAgent-to-agent test type(Option C).
Enterprise Agents are software probes deployed on infrastructure owned or controlled by the organization, such as switches or routers in the branch offices and servers in the data center. Unlike Agent-to-server tests, which only provide one-way metrics and approximate path data, anAgent-to-agent testprovides bi-directional network metrics. This includes detailed throughput, packet loss, latency, and jitter measurements in both directions, which is critical for identifying asymmetric routing or link saturation that might affect application performance.
Alternative options are less suitable for this specific internal monitoring requirement:
* Cloud Agents (Options A and B):These are located in global ISP data centers and cannot be placed inside the organization's private data center or branch LAN to measure internal path characteristics.
* HTTP/DNS Server tests (Options B, D, and E):These target specific services but do not provide the granular, bi-directional network-layer performance data (like throughput or path visualization) that an Agent-to-agent test delivers.
* Agent-to-server (Option E):While useful for reaching a target that cannot host an agent, it loses the benefit of the destination agent's ability to measure the "return" path independently.
By deploying Enterprise Agents at each site and configuring Agent-to-agent tests, the engineer gains the highest level of visibility into the health of the private WAN or SD-WAN fabric connecting the branches to the data center.
NEW QUESTION # 72
Which optimization recommendation is based on network capacity planning and data interpretation?
Answer: B
Explanation:
Topology and configuration changes are recommended for network capacity planning based on data interpretation, ensuring optimized network performance and scalability.
NEW QUESTION # 73
What type of alert rule impacts end-user experience by monitoring browser behavior?
Answer: B
Explanation:
User experience alert rules impact end-user experience by monitoring browser behavior, ensuring optimal performance and usability of web applications in network assurance.
NEW QUESTION # 74
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: D
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 # 75
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