Cisco 200-901 - DevNet Associate (DEVASC)

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The function my_func() returns True when it executes normally. To test this function using Python's unittest framework, the correct assertion to use is assertTrue. This method tests if the given expression evaluates to True.

Option A (self.assertTrue(my_func())): This assertion checks if my_func() returns True.

Option B (self.assertRaises(my_func())): This is used to check if a specific exception is raised, which is not applicable here.

Option C (self.assertEqual(my_func(), 'true')): This checks if my_func() returns the string 'true', which is not correct as my_func() returns a boolean True.

Option D (self.assertFalse(my_func())): This checks if my_func() returns False, which is the opposite of what is needed.

Artifact repositories play a crucial role in Continuous Integration/Continuous Deployment (CI/CD) pipelines by:

Storing Build Artifacts: They store files needed during the build process, such as dependencies, and files generated during the build process, such as binaries.

Providing Traceability: They offer traceability and versioning of binary files, which is essential for managing builds and releases.

Search and Management: They allow developers to search and manage binary files efficiently, ensuring that the correct versions of dependencies are used.

YANG model-driven programmability allows for the configuration of devices using data models. In NX-OS, this includes both native and OpenConfig-based models.

YANG Models: These are used to model configuration and state data for network devices. Native models are specific to the vendor, while OpenConfig models are vendor-neutral.

Configuration Management: YANG models facilitate consistent and programmable configuration of network devices, which can be done through APIs like NETCONF or RESTCONF.

Bare Metal environments refer to physical servers that run directly on the hardware without a hypervisor. They offer several characteristics related to application deployment:

Provide workloads with access to hardware features: Bare Metal environments allow applications to directly access hardware resources, which can be critical for performance-sensitive applications.

Suitable for legacy applications that do not support virtualization: Some older applications may not be compatible with virtualized environments or may require direct access to physical hardware, making Bare Metal servers an ideal choice.

Bare Metal environments: Offer direct hardware access and are suitable for certain legacy applications.

Not specifically designed for container-based workloads: While containers can run on Bare Metal, these environments are not specifically tailored for containers.

Not providing hypervisors: Bare Metal environments do not include a hypervisor layer, which is a feature of virtualized environments.

API keys should be stored securely to prevent unauthorized access. The best practice is to store them encrypted in a configuration file that is separate from the code. This approach ensures that sensitive information is not hardcoded in the source code, which could be exposed through version control or other means. Keeping API keys in encrypted configuration files also allows for better management and updating of keys without changing the application code.

The error message "JSON-PARSE-ERROR" and "Unexpected character ('"' (code 34))" indicates a problem with the formatting of the JSON payload. Specifically, there are likely incorrect characters or misplaced quotes within the JSON structure. JSON formatting issues are common errors that can occur due to syntax mistakes such as missing commas, incorrect braces, or invalid characters.

To resolve this, carefully check the JSON structure for proper formatting, ensuring all fields are correctly defined and that syntax rules are followed.

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For Basic Authentication in REST APIs, the Base64 encoded credentials must be included in the header of the HTTP request. The correct method is to include the following header in the request:

Authorization: Basic am9objowMTlzNDU2Nzg=

References: Cisco DevNet Associate Certification Guide, Chapter on REST API Authentication methods.

By segmenting the network into separate subnets for clients and servers, you can control the types of traffic that flow between these segments using access control lists (ACLs) and firewall rules. This can enhance security by limiting access to critical server resources and reducing the risk of unauthorized access.

Subnets will split domains to limit failures (Option C):

Segmenting the network into different subnets helps contain network issues within a specific segment, preventing them from affecting the entire network. This approach improves network stability and reliability, as issues in the client subnet will not impact the server subnet and vice versa.

References:

Cisco Subnetting and Network Segmentation

Cisco Router and ACL Configuration Guide

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