300-445試験解説、300-445予想試験
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Cisco 300-445 認定試験の出題範囲:
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300-445予想試験、300-445無料過去問
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Cisco Designing and Implementing Enterprise Network Assurance 認定 300-445 試験問題 (Q48-Q53):
質問 # 48
A company is noticing sporadic slowdowns in their web application performance, impacting user experience.
They suspect it might be related to high CPU utilization on employee laptops, potentially caused by background processes. Which ThousandEyes alert type and condition combination would be most effective in identifying if endpoint CPU performance is contributing to this issue?
- A. Scheduled Tests > Endpoint End-to-End (server), Memory load # %
- B. Scheduled Tests > Endpoint Path Trace, Path length > #
- C. Real User Tests > Endpoint, CPU utilization # %
- D. Real User Tests > Network Tests and Path Trace, End-to-End Packet Loss
正解:C
解説:
In theDesigning and Implementing Enterprise Network Assurance (300-445 ENNA)curriculum, isolating performance issues on end-user machines requires a combination of application-layer experience data and local system telemetry. When an architect suspects that local hardware constraints, such as high CPU usage, are degrading the digital experience, theEndpoint Agentis the required vantage point.
The correct combination isReal User Tests > Endpoint, CPU utilization # %(Option C). This alert configuration is effective for several reasons:
* Targeted Visibility:It directly monitors the user's device (Endpoint) where the hardware bottleneck is suspected to reside.
* Real-Time Context:By utilizingReal User Tests (RUM), the agent gathers performance data during actual user activity (e.g., browsing the web application). This ensures that the CPU spikes are correlated with active application usage, providing a representative view of the impact on experience.
* Threshold Alerting:The condition monitors for CPU utilization exceeding a defined percentage threshold (# %). This allows IT teams to be notified only when the CPU load reaches problematic levels that are known to cause application sluggishness or browser "freezing".
Alternative options are less effective for this specific troubleshooting goal:
* Option A:Monitors network loss, which would not identify a local CPU bottleneck.
* Option B:Monitors path length (hops), which is a routing metric irrelevant to local hardware performance.
* Option D:Monitors memory load during scheduled tests. While memory is a factor, the specific suspicion in this scenario is CPU utilization, and scheduled tests do not always capture the same load impact as a real user interacting with the browser.
質問 # 49
How does configuring tests using Thousand Eyes and Meraki Insights contribute to network optimization?
- A. Enhancing network security
- B. Accelerating data transfer speeds
- C. Identifying network bottlenecks
- D. Minimizing latency
正解:C
解説:
Configuring tests using Thousand Eyes and Meraki Insights contributes to network optimization by identifying network bottlenecks and performance issues, enabling proactive resolution and resource allocation.
質問 # 50
What role does synthetic testing play in network assurance?
- A. Identifying real-time traffic patterns
- B. Analyzing server logs
- C. Monitoring hardware health
- D. Simulating user interactions
正解:D
解説:
Synthetic testing plays a crucial role in network assurance by simulating user interactions with applications, enabling proactive monitoring and performance optimization.
質問 # 51
Considering the observed network behavior and the information in the exhibits, which action would be the most appropriate next step for the network administrator to take?
- A. Reach out to the Internet Service Provider (ISP) to report the suspected BGP hijacking incident
- B. Implement traffic filtering rules on the firewall to block traffic originating from AS 10297
- C. Restart the DNS server to refresh its cache and potentially resolve the observed issue
- D. Contact the internal network team to investigate potential misconfigurations on the local routers
正解:A
解説:
TheDesigning and Implementing Enterprise Network Assurance (300-445 ENNA)framework emphasizes that the goal of internet intelligence is to enable rapid and accurate escalation to the party responsible for a service degradation. Based on the evidence of a BGP Hijack identified in the previous question, the issue is occurring entirely within the public internet ecosystem.
The most appropriate next step is toreach out to the Internet Service Provider (ISP) to report the suspected BGP hijacking incident(Option B). Since the traffic is being misdirected by an external Autonomous System (AS 10297) before it reaches the intended destination (AS 16509), the fix must occur at the routing policy level of the major transit providers. The network administrator should provide the ISP with the ThousandEyes "Share Link" or screenshots showing the path change and the unauthorized AS announcement, as this data serves as proof to accelerate the ISP's mitigation efforts, such as implementing prefix filters or contacting the offending network.
Other options are ineffective for this specific scenario:
* Option A:The path visualization shows that traffic is successfully leaving the local network and reaching the public internet; the problem is many hops away from the internal routers.
* Option C:Blocking trafficfromAS 10297 does not solve the problem of your traffic beingattractedto it.
The hijack affects how the rest of the world (including your ISP) sees the route to your destination.
* Option D:DNS is not the issue; the agent successfully resolved the hostname to the correct IP, but the BGP layer misdirected the packets at the routing level.
By identifying the issue as an external routing event, the administrator avoids wasting internal resources and directly triggers the necessary external remediation.
質問 # 52
Which alert rule configuration affects the end-user experience by monitoring CPU utilization and connectivity types?
- A. Performance alert
- B. Threshold alert
- C. User experience alert
- D. Security alert
正解:C
解説:
User experience alert rules affect the end-user experience by monitoring CPU utilization, connectivity types, and other factors impacting usability.
質問 # 53
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