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| Section | Objectives |
|---|---|
| Troubleshooting and Analysis | - Performance and fault analysis
|
| Monitoring and Telemetry Technologies | - Data collection mechanisms
|
| Enterprise Network Assurance Architecture | - Assurance concepts and methodologies
|
| Assurance Platforms and Tools | - Cisco assurance platforms
|
| Automation and Data Interpretation | - Data-driven assurance workflows
|
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NEW QUESTION # 65
Carefully review the exhibits. Which detail indicates the network issue might be caused by a BGP Hijack?
Answer: D
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 # 66
Which two alert rules notify an engineer when a BGP route hijacking occurs? (Choose two.)
Answer: D,E
NEW QUESTION # 67
How does alert rule validation contribute to network assurance?
Answer: D
Explanation:
Alert rule validation contributes to network assurance by ensuring alert accuracy and reliability, enabling timely detection and resolution of network issues and vulnerabilities.
NEW QUESTION # 68
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: B
Explanation:
According to the Designing 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 using Enterprise Agents with the Agent-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, an Agent-to-agent test provides 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.
NEW QUESTION # 69
What is the primary purpose of synthetic web tests in network assurance?
Answer: B
Explanation:
The primary purpose of synthetic web tests is to simulate user interactions with web applications, facilitating performance monitoring and optimization in network assurance.
NEW QUESTION # 70
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