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| Section | Objectives |
|---|---|
| Data Collection Implementation | - Deploy and manage agents
|
| Insights and Alerts | - Configure and manage alerts
|
| Platforms and Architecture | - Describe network assurance architecture
|
| Data Analysis | - Identify trends and anomalies
|
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NEW QUESTION # 10
An engineer is trying to configure a Page Load test and is trying to assign the east1-agent-1 to run it, but cannot see that agent listed. What is the reason that the designated agent does not appear?
Answer: A
Explanation:
In the framework of Designing and Implementing Enterprise Network Assurance (300-445 ENNA), selecting the appropriate agent for specific test types is a critical configuration step. The ThousandEyes platform utilizes different agent binaries and capabilities depending on the underlying hardware and software environment. Specifically, Page Load tests and Transaction tests require the agent to have a browser engine (Chromium) installed and functional to render web content and measure DOM-related metrics.
According to the ENNA implementation guidelines, not all Enterprise Agents support these browser- based tests. The exhibit displays a "New Test" configuration screen where the engineer is searching for "east1-agent-1". While other agents like "west-2-ag-1" are visible, the designated agent is missing because it does not support Page load tests (Option D). This common occurrence happens when an Enterprise Agent is deployed on resource-constrained hardware-- such as certain Cisco Catalyst 9000 switches or Cisco ISR 4000 series routers--where the Chromium browser package is either not supported or has not been enabled due to memory and CPU limitations.
NEW QUESTION # 11
Carefully review the exhibits. Which detail indicates the network issue might be caused by a BGP Hijack?
Answer: B
Explanation:
In theDesigning 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 contrastingExhibit 3.4-1(Before the Outage) andExhibit 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 withAmazon.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 encounters100% Forwarding Loss at the node ten7-8.core-2.xlhost.com.
Thechange in the Autonomous System (AS) numberfrom 16509 to 10297 (Option B) is the most concrete indicator of a BGP Hijack. While symptoms such asAvailability Drop(Option A),Response Delay(Option C), andPacket 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 # 12
Refer to the exhibit.
A network admin has been tasked with monitoring the IPv6 record and name server resolution times with different agents. Select the two actions that the engineer must take to meet the requirements.
Answer: B,C
Explanation:
According to the Designing and Implementing Enterprise Network Assurance (300-445 ENNA) curriculum, DNS testing is a fundamental component of ensuring application availability and performance.
The ThousandEyes platform provides two primary types of DNS tests: DNS Server and DNS Trace .
To satisfy the specific requirements of monitoring IPv6 records and name server resolution times , the engineer must utilize the DNS Server test . This test type is designed to measure the performance of specific DNS servers by querying them for particular resource records.
* Monitoring IPv6 Records: In the DNS system, IPv6 address records are known as AAAA records .
Therefore, to monitor the availability and resolution of IPv6 addresses for a domain, the engineer must create a DNS Server test and set the query type to AAAA (Option B).
* Monitoring Name Server Resolution Times: To measure how long it takes for a DNS server to return the authoritative name servers for a domain, the engineer must query for NS (Name Server) records .
By creating a DNS Server test targeting the NS record (Option D), the platform can provide granular metrics on the response time and availability of those specific records from the perspective of the selected agents.
DNS Trace tests (Options C and E) are less suitable for measuring specific resolution times of a single server; instead, they are used to visualize the entire delegation path from the root servers down to the authoritative servers to identify where a " break " in the chain occurs. Furthermore, an A record query (Option A) only provides the IPv4 address, failing the requirement to monitor IPv6. By selecting DNS Server tests for AAAA and NS records, the administrator ensures they have the precise performance data needed to baseline and troubleshoot the organization ' s DNS health.
NEW QUESTION # 13
What is the primary function of a synthetic user agent in network assurance?
Answer: D
Explanation:
Synthetic user agents generate simulated traffic to assess network performance and identify potential issues.
NEW QUESTION # 14
Why might an organization choose digest over basic authentication when configuring tests?
(Choose Two)
Answer: A,D
NEW QUESTION # 15
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