CiscoProfessional level300-420Page 4 of 4

300-420 exam dumps: questions 301 to 322 of 322

Page 4 of the free 300-420 question bank for the Designing Cisco Enterprise Networks exam. Questions 301 to 322 are listed below, the first 5 in full with answers and explanations. Back to page 1 for the exam overview and FAQ.

Question bank last updated February 2025

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Questions 301 to 305 of 322

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300-420 Question 301

Select 3

An enterprise network administrator is considering implementing model-driven telemetry (MDT) to improve network monitoring and troubleshooting. Which of the following are key impacts of using model-driven telemetry on the network?

A
Real-time streaming of data reduces the need for periodic polling mechanisms.
B
Increased network resource utilization due to duplicate data being sent.
C
Improved scalability and efficiency of network monitoring systems.
D
Direct support for legacy SNMP-based monitoring systems without additional configuration.
E
Enhanced granularity of data collection by subscribing to specific telemetry data models.

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Correct answers: A, C, E

Explanation

Model-driven telemetry significantly enhances network monitoring by providing real-time streaming of data, improving scalability, and enabling highly granular data collection through telemetry model subscriptions. Unlike traditional SNMP-based systems, MDT reduces overhead by avoiding periodic polling and focuses on specific data, making network management more efficient and scalable.

A. Correct.
Model-driven telemetry uses real-time streaming of data, which eliminates the need for traditional periodic polling mechanisms, reducing delays and overhead.
B. Incorrect.
This is incorrect because MDT reduces unnecessary data by supporting selective data subscriptions, avoiding duplicate or irrelevant data transmission.
C. Correct.
MDT improves scalability and efficiency by enabling targeted data collection and reducing the processing burden on both devices and monitoring systems.
D. Incorrect.
Legacy SNMP systems are not inherently supported by model-driven telemetry. Additional configurations or translation tools are required to integrate them.
E. Correct.
Model-driven telemetry allows for highly granular data collection by enabling administrators to subscribe to specific telemetry models, making monitoring more targeted and effective.

300-420 Question 302

Single answer

An enterprise network has recently implemented model-driven telemetry for network monitoring. The network engineer reports reduced delays in troubleshooting and improved anomaly detection. What is one key reason why model-driven telemetry has this impact on the network?

A
It uses a subscription-based model to push real-time data from the network devices to collectors.
B
It relies on SNMP polling to retrieve data periodically from network devices.
C
It reduces the need for network engineers to configure devices manually.
D
It replaces all traditional monitoring protocols with a single unified protocol.

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Correct answer: A

Explanation

Model-driven telemetry leverages a subscription-based model to push real-time data from network devices to external collectors. This reduces delays associated with periodic polling methods (such as SNMP) and ensures that anomalies and issues are detected more efficiently. By streaming telemetry data continuously, it enables quicker troubleshooting and better decision-making in enterprise networks.

A. Correct.
Model-driven telemetry uses a subscription-based model where real-time data is pushed from devices to collectors, enabling faster and more efficient monitoring.
B. Incorrect.
SNMP polling is not a part of model-driven telemetry. SNMP relies on periodic polling, which can introduce delays and is less efficient compared to telemetry's real-time capabilities.
C. Incorrect.
While model-driven telemetry improves network visibility, it does not directly eliminate the need for manual configurations by engineers.
D. Incorrect.
Model-driven telemetry does not replace all traditional protocols but rather complements existing methods to provide enhanced real-time data collection.

300-420 Question 303

Select 3

An enterprise network is designed with multiple branch sites that use a centralized controller for policy and configuration management. The network administrator wants to implement periodic publication to distribute route updates to the branches efficiently. Which of the following considerations must be addressed to ensure proper implementation of periodic publication?

A
Ensure that the publication interval aligns with the branch routers' processing capabilities.
B
Configure a reliable transport protocol, such as TCP, for the periodic updates to ensure delivery.
C
Enable synchronization of periodic updates with network devices' routing timers to avoid conflicts.
D
Use multicast or anycast mechanisms to efficiently distribute periodic updates to multiple branches.
E
Reduce the publication interval to the lowest possible value to minimize update delays.

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Correct answers: A, C, D

Explanation

Periodic publication involves distributing updates at regular intervals to ensure consistent and efficient dissemination of information across the network. Proper configuration requires considering processing capacity, synchronization with routing timers, and efficient distribution mechanisms like multicast or anycast. These considerations ensure network stability, scalability, and optimal performance. Reducing the interval excessively or relying on protocols like TCP, which are not typically used for this purpose, can lead to inefficiencies.

A. Correct.
Periodic publication intervals must be configured to match the branch routers' processing capabilities to avoid overloading devices and ensure updates are processed correctly.
B. Incorrect.
While TCP provides reliability, periodic publication often uses other mechanisms like multicast or UDP for efficiency. TCP is not typically required for this purpose.
C. Correct.
Synchronization of periodic updates with routing timers helps avoid timing conflicts and ensures updates are processed in harmony with existing routing configurations.
D. Correct.
Multicast or anycast mechanisms are optimal for distributing updates to multiple branches, reducing bandwidth consumption and ensuring scalability.
E. Incorrect.
While shorter intervals may reduce update delays, overly frequent updates can cause unnecessary network overhead and degrade performance.

300-420 Question 304

Single answer

An enterprise network is using a periodic publication model with its SDN (Software-Defined Networking) controller to distribute network topology updates to edge devices. Which statement accurately describes the behavior of periodic publication in this context?

A
The SDN controller sends updates to edge devices only when there is a change in the network topology.
B
The SDN controller sends updates to edge devices at regular, predefined intervals regardless of topology changes.
C
The SDN controller waits for edge devices to request updates before responding with the latest topology information.
D
The SDN controller sends updates to edge devices based on a combination of event-driven triggers and periodic intervals.

Show answer and explanation

Correct answer: B

Explanation

Periodic publication in SDN involves distributing updates at fixed, predefined intervals to ensure devices have the latest information, even if there are no changes in the network. This is different from event-driven or request-response models, which rely on triggers or device requests. Option 2 accurately describes the nature of periodic publication.

A. Incorrect.
Incorrect: This describes an event-driven publication model, not a periodic publication model, where updates are sent only on changes in the topology.
B. Correct.
Correct: A periodic publication model operates by sending updates at regular intervals, regardless of whether the topology has changed or not.
C. Incorrect.
Incorrect: This describes a request-response model, where updates are provided only when the edge devices request them, which is not periodic publication.
D. Incorrect.
Incorrect: This describes a hybrid model that combines event-driven and periodic updates, but it is not purely periodic publication.

300-420 Question 305

Single answer

An enterprise network design team is implementing a network monitoring solution using a telemetry model. They want to ensure that time-sensitive data, such as interface statistics and CPU utilization, is sent periodically from network devices to a central collector. Which key design consideration should the team focus on to ensure proper delivery and performance of periodic publications?

A
Configuring the appropriate sampling interval for telemetry data updates
B
Using SNMP polling for data collection instead of telemetry
C
Enabling periodic syslog messages for real-time updates
D
Implementing Quality of Service (QoS) to prioritize telemetry traffic

Show answer and explanation

Correct answer: A

Explanation

In telemetry-based network monitoring, periodic publication involves sending updates at regular intervals. Configuring an appropriate sampling interval is critical to achieve this, as it determines how often data is sent to the collector. This ensures that the data remains current while minimizing unnecessary network overhead. Although QoS and other factors can improve telemetry performance, the sampling interval is the key design factor for periodic publications.

A. Correct.
Configuring the appropriate sampling interval ensures that telemetry data is sent at regular intervals, which is critical for periodic publication and maintaining the balance between network performance and data freshness.
B. Incorrect.
Using SNMP polling is not as efficient for periodic publication because it relies on request-response communication, which can introduce delays and increase overhead compared to telemetry.
C. Incorrect.
Syslog messages are event-driven, not periodic, and are not suitable for time-sensitive updates like telemetry data.
D. Incorrect.
While QoS can help prioritize telemetry traffic, it is not the primary consideration for ensuring proper periodic publications. The sampling interval is more fundamental to meeting periodic publication requirements.

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300-420 practice questions 301 to 322 of 322

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