D416 DevNet Fundamentals
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Compared to virtual machines, containers
- Take much less space since copies of the operating system are not created
- Take more space because more copies of the operating system are created
- Are less efficient in computer resource utilization
- Are more difficult to automate
Explanation
Containers are lightweight virtualization units that share the host operating system’s kernel rather than replicating it for each instance, as virtual machines do. This makes containers significantly smaller in size, faster to start, and more resource-efficient. Because they don’t require multiple OS copies, they take up less disk space and enable higher scalability.
Correct Answer:
Take much less space since copies of the operating system are not created.
If a developer wants to integrate a third-party service into their application using a REST API, which of the following would be the best approach?
- Ignore the API and create a new service.
- Write the entire application from scratch without any tools.
- Utilize the SDK provided by the third-party service.
- Use only the API documentation without any libraries.
Explanation
When integrating a third-party REST API, using the Software Development Kit (SDK) provided by the service is the best approach. SDKs simplify the integration process by offering prebuilt methods, authentication handling, and error management specifically designed for that API. This reduces development time, minimizes coding errors, and ensures compatibility with the API provider’s standards.
Correct Answer:
Utilize the SDK provided by the third-party service.
In Cisco Intersight, what is the term used to refer to the section that displays all claimed devices?
- Targets
- Assets
- Profiles
- Policies
Explanation
In Cisco Intersight, the section that displays all claimed devices—such as servers, storage systems, and fabric interconnects—is called Assets. The Assets area provides a comprehensive view of every device under management, including status, configuration, and health details. This centralized inventory enables administrators to efficiently monitor and manage hardware resources across their infrastructure through the Intersight platform.
Correct Answer:
Assets
Describe why a true RESTful API should not be stateful.
- A true RESTful API should be stateful to maintain session information.
- A true RESTful API should not be stateful because it relies on the client to manage the state, allowing for scalability and simplicity in interactions.
- A true RESTful API must always store state on the server.
- A true RESTful API can be stateful if it improves performance.
Explanation
A true RESTful API is designed to be stateless, meaning that each request from a client must contain all the information needed to process it. The server does not store any session or context information between requests. This stateless nature simplifies the server’s design, improves scalability, and allows multiple servers to handle client requests independently. By delegating state management to the client, RESTful APIs can efficiently handle large-scale, distributed systems without maintaining complex session data on the server side.
Correct Answer:
A true RESTful API should not be stateful because it relies on the client to manage the state, allowing for scalability and simplicity in interactions.
If a company decides to implement Edge Computing for its IoT devices, what benefit should they expect regarding data transmission?
- Reduced latency
- Higher data processing times
- Increased data transmission costs
- More reliance on centralized servers
Explanation
Edge Computing brings data processing closer to the source of data generation—such as IoT devices—rather than relying solely on centralized cloud servers. This proximity significantly reduces latency, allowing for faster response times and more efficient real-time decision-making. It also helps minimize bandwidth usage and dependency on centralized infrastructure, which in turn enhances performance and reliability for time-sensitive applications.
Correct Answer:
Reduced latency
If a development team is tasked with creating a new API, how might they utilize Sequence Diagrams in their process?
- To create a marketing strategy for the API launch.
- To generate the API keys needed for access.
- To define the hardware specifications required for deployment.
- To map out the interactions between the API and its consumers, ensuring clarity in communication and functionality.
Explanation
Sequence Diagrams are an essential tool in API development as they visually represent how components of a system interact over time. They help developers map out the flow of requests and responses between the API and its consumers, ensuring that communication patterns and data exchanges are clearly understood before implementation. This visualization aids in identifying potential design flaws early and ensures consistency between development and integration teams.
Correct Answer:
To map out the interactions between the API and its consumers, ensuring clarity in communication and functionality.
Describe the role of the Data Plane in networking and how it differs from the Control Plane.
- The Data Plane is used for network management, while the Control Plane is for data forwarding.
- The Data Plane manages routing decisions, while the Control Plane forwards user traffic.
- The Data Plane handles network security, while the Control Plane manages user traffic.
- The Data Plane is responsible for forwarding user traffic, while the Control Plane manages routing and network decisions.
Explanation
In networking, the Data Plane (also known as the forwarding plane) is responsible for forwarding user traffic based on the instructions provided by the Control Plane. While the Data Plane handles the actual movement of packets across the network, the Control Plane focuses on routing decisions, topology management, and maintaining network intelligence. This separation ensures efficiency—where the Control Plane determines how traffic should flow, and the Data Plane executes those decisions at high speed.
Correct Answer:
The Data Plane is responsible for forwarding user traffic, while the Control Plane manages routing and network decisions.
This HTTP status code indicates that the error status codes point the finger at clients.
- 4xx
- 1xx
- 3xx
- 2xx
Explanation
HTTP status codes in the 4xx range indicate client-side errors. These occur when a request sent by the client is invalid or cannot be processed by the server. Examples include 400 Bad Request, 401 Unauthorized, and 404 Not Found. The “4xx” class of codes effectively means the problem originated from the client, such as malformed syntax, invalid authentication, or missing resources.
Correct Answer:
4xx
In a collaborative software development project, how would implementing version control benefit the team when multiple developers are working on the same codebase?
- It allows multiple developers to work on the same codebase simultaneously without overwriting each other's changes.
- It automatically generates documentation for the codebase.
- It ensures that only one developer can work on the codebase at a time.
- It prevents developers from making any changes to the codebase.
Explanation
Version control systems, such as Git, enable multiple developers to collaborate effectively on the same project by tracking changes, managing different branches, and merging updates seamlessly. This ensures that no developer’s work is lost or overwritten, even when changes occur concurrently. Additionally, version control provides a complete history of modifications, making it easier to review code, revert errors, and maintain project integrity during collaborative development.
Correct Answer:
It allows multiple developers to work on the same codebase simultaneously without overwriting each other's changes.
What is the correct key:value pair format for the authentication token in the Firepower API?
-
X-auth-secure-token:
-
X-auth-access-token:
-
X-auth-token:
-
X-auth-bearer-token:
Explanation
In the Cisco Firepower API, the correct key:value pair for including the authentication token in an API request header is X-auth-token:
Correct Answer:
X-auth-token:
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