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Question 181.

Which technology exposes device telemetry through subscriptions?

1. Telnet
2. TFTP
3. gNMI
4. SMTP

Correct Answer: 3

Explanation:

gNMI supports subscription-based streaming telemetry, allowing a client to receive updates from network devices as monitored values change. This approach can provide more timely information than repeatedly polling devices for the same data. Automation applications can subscribe to selected operational paths and process incoming updates for monitoring, analytics, or event-driven workflows. gNMI commonly works with YANG-modeled information and uses gRPC transport. Telnet provides remote CLI access, TFTP transfers files, and SMTP handles email communication. Streaming subscriptions are particularly useful for collecting high-frequency operational information.

Question 182.

Which Python expression checks whether a value exists in a list?

1. in
2. is
3. not
4. as

Correct Answer: 1

Explanation:

The Python in operator checks whether a specified value exists within a collection such as a list, tuple, set, or string. In network automation, it can be used to determine whether a device name appears in an inventory, whether an interface exists in collected data, or whether a required capability is present in a list. The is operator checks object identity, while not negates a condition and as is commonly used with imports or exception handling. Membership testing is a simple but useful technique for automation logic.

Question 183.

Which API response indicates that a requested resource was not found?

1. 201
2. 204
3. 404
4. 409

Correct Answer: 3

Explanation:

HTTP status code 404 indicates that the requested resource could not be found by the server. In network automation, an API might return 404 when a script references an invalid device identifier, nonexistent interface object, or removed policy resource. Automation code should distinguish this from other response categories because retrying an unchanged request usually will not make a nonexistent resource appear. Status 201 indicates successful creation, 204 indicates successful processing without response content, and 409 commonly indicates a resource conflict. Proper response classification improves troubleshooting and error handling.

Question 184.

Which NETCONF operation can retrieve configuration from a datastore?

1. lock
2. get-config
3. commit
4. discard-changes

Correct Answer: 2

Explanation:

The NETCONF get-config operation retrieves configuration data from a specified datastore, such as running or candidate when supported. Automation clients can use it to inspect structured configuration and compare the current state against an intended configuration. This makes it useful for compliance checks, change validation, and configuration analysis. lock controls access to a datastore, commit applies candidate changes on systems supporting that workflow, and discard-changes removes uncommitted candidate modifications. Understanding retrieval operations helps automation workflows obtain accurate configuration information before making decisions.

Question 185.

Which Python library is suited for tabular data analysis?

1. Pandas
2. Paramiko
3. Requests
4. PyYAML

Correct Answer: 1

Explanation:

Pandas is a Python library designed for data manipulation and analysis, particularly with tabular datasets. Network automation workflows can use Pandas to analyze inventory information, interface statistics, compliance results, telemetry exports, or collected operational records. Its DataFrame structure makes filtering, grouping, sorting, and transforming tabular information convenient. Paramiko focuses on SSH communication, Requests handles HTTP requests, and PyYAML works with YAML data. Using a data-analysis library can help turn large collections of automation results into structured reports and support further operational analysis.

Question 186.

Which Ansible condition controls whether a task executes?

1. notify
2. register
3. when
4. become

Correct Answer: 3

Explanation:

The Ansible when keyword defines a conditional expression that determines whether a task should execute. This is useful when automation behavior depends on device facts, variable values, command results, or other runtime conditions. For example, a task can be executed only when a particular platform or configuration state is detected. notify triggers handlers, register stores task results, and become controls privilege escalation. Conditional execution helps create flexible playbooks that can safely accommodate different devices and environments without maintaining entirely separate workflows.

Question 187.

What does API authentication primarily establish?

1. Resource formatting
2. Client identity
3. Response compression
4. Data pagination

Correct Answer: 2

Explanation:

API authentication establishes the identity of the client attempting to access an API. Common mechanisms include tokens, API keys, certificates, or username-and-password credentials. After authentication, authorization controls which resources or operations that identity is permitted to use. In network automation, authentication must be handled securely so credentials are not unnecessarily exposed in source code, logs, or command output. Response formatting, compression, and pagination serve different purposes. Understanding the distinction between authentication and authorization is important when troubleshooting API access failures.

Question 188.

Which HTTP method is generally safe to repeat without changing resource state?

1. POST
2. PATCH
3. GET
4. CONNECT

Correct Answer: 3

Explanation:

GET is considered a safe HTTP method because it is intended to retrieve information without requesting a state-changing operation. Repeating the same GET request should not intentionally modify the target resource. This characteristic makes GET useful for polling device information, retrieving inventories, and checking operational state through APIs. POST generally performs creation or action-oriented operations, while PATCH modifies selected resource attributes. CONNECT has a different purpose related to establishing a tunnel. Automation engineers should still account for API-specific behavior and should not assume every endpoint behaves identically.

Question 189.

Which format is commonly used for Ansible playbooks?

1. XML
2. YAML
3. CSV
4. INI

Correct Answer: 2

Explanation:

Ansible playbooks are commonly written in YAML because YAML provides a readable structure for representing plays, tasks, variables, conditions, and other automation elements. Its indentation-based syntax allows complex workflows to remain relatively easy to inspect. Network automation engineers can use YAML to describe device groups, connection settings, configuration tasks, and validation steps. XML and CSV serve different data purposes, while INI syntax is commonly associated with certain configuration or inventory files. Correct indentation and valid YAML structure are essential because formatting errors can prevent playbooks from executing.

Question 190.

Which method helps safely retry transient API requests?

1. Fixed backoff
2. Infinite looping
3. Error deletion
4. Request flooding

Correct Answer: 1

Explanation:

Fixed backoff introduces a defined waiting period before retrying an operation after a temporary failure. It can help prevent an automation client from immediately sending repeated requests to an overloaded or temporarily unavailable service. A more advanced implementation may use exponential backoff and jitter, especially when many clients could retry simultaneously. Infinite loops and request flooding can increase service pressure and make failures worse, while deleting errors removes useful diagnostic information. Retry logic should also have a maximum attempt count and should distinguish transient failures from permanent errors.

Question 191.

Which Python method removes and returns the final list item?

1. clear()
2. remove()
3. pop()
4. count()

Correct Answer: 3

Explanation:

The Python pop() method removes and returns an item from a list. When called without an index, it operates on the final element. This can be useful when automation workflows maintain a stack-like collection of pending values or need to process and remove entries dynamically. remove() deletes the first matching value but does not return it in the same way, clear() removes all list elements, and count() reports how many times a value occurs. Understanding list operations helps automation scripts manage temporary collections efficiently.

Question 192.

Which API design supports filtering resources by criteria?

1. Query parameters
2. VLAN headers
3. MAC learning
4. TCP flags

Correct Answer: 1

Explanation:

Query parameters allow API clients to provide additional criteria that influence how resources are returned. An API may support parameters for filtering by device name, status, location, type, or another supported attribute. This allows automation scripts to request only relevant records instead of downloading an entire collection and filtering everything locally. The exact parameter syntax varies by API implementation. VLAN headers, MAC learning, and TCP flags are networking concepts rather than general REST mechanisms for resource filtering. Effective query parameters can reduce processing and network overhead.

Question 193.

Which Git command displays previous commit information?

1. git push
2. git log
3. git switch
4. git remote

Correct Answer: 2

Explanation:

The git log command displays commit history for a repository. Automation developers can use it to review previous changes to scripts, templates, tests, or configuration-related files. Commit history can help identify when a behavior changed, understand the evolution of an automation workflow, or locate a version that needs investigation. git push sends local commits to a remote repository, git switch changes branches, and git remote manages or displays remote repository information. Maintaining useful commit messages further improves traceability during automation development.

Question 194.

Which mechanism validates data against a defined structure?

1. Schema validation
2. Packet capture
3. Address resolution
4. Route aggregation

Correct Answer: 1

Explanation:

Schema validation checks whether data conforms to a defined structure, including expected fields, data types, constraints, or relationships. In network automation, validation can prevent malformed API payloads or incorrect configuration data from reaching managed devices. YANG models provide structured definitions for network-management data, while other schema technologies may be used for application-specific formats. Packet capture analyzes traffic, address resolution maps network identifiers, and route aggregation combines routing information. Validating inputs before deployment can catch errors early and reduce failures during automation execution.

Question 195.

Which HTTP response commonly signals a conflicting resource state?

1. 202
2. 206
3. 409
4. 418

Correct Answer: 3

Explanation:

HTTP status code 409 Conflict indicates that a request could not be completed because it conflicts with the current state of the target resource. In automation environments, this might occur when a client attempts to create an object that already exists or modifies a resource whose state conflicts with the requested operation. The exact interpretation depends on the API. Status 202 indicates accepted processing, 206 represents partial content, and 418 is a nonstandard status originally associated with an April Fools specification. Handling 409 responses explicitly can improve automation troubleshooting.

Question 196.

Which Python construct ensures cleanup after an operation?

1. finally
2. lambda
3. assert
4. global

Correct Answer: 1

Explanation:

The Python finally block executes after the associated try operation, whether an exception occurs or not. It is useful for cleanup activities such as closing connections, releasing resources, or restoring temporary state. Network automation scripts may use this pattern when managing sessions or other resources that should not remain open after processing completes. lambda creates anonymous functions, assert performs debugging-oriented checks, and global changes variable-scope behavior. Proper cleanup helps prevent resource leaks and makes automation applications more reliable during repeated execution.

Question 197.

Which telemetry model organizes data hierarchically?

1. YANG
2. SMTP
3. ARP
4. FTP

Correct Answer: 1

Explanation:

YANG organizes network-management data into a structured hierarchical model. It defines containers, lists, leaf nodes, types, relationships, constraints, and other elements that describe configuration and operational information. Network management protocols such as NETCONF and RESTCONF can use YANG-defined models to provide consistent representations of device data. SMTP handles email delivery, ARP performs local address resolution, and FTP transfers files. Model-driven automation benefits from hierarchical structures because applications can target specific portions of device data without relying on unstructured command-line output.

Question 198.

Which practice improves automation reproducibility?

1. Manual dependencies
2. Untracked scripts
3. Version pinning
4. Random environments

Correct Answer: 3

Explanation:

Version pinning specifies known versions of software dependencies so that an automation project can use predictable components across environments. This can reduce unexpected behavior caused by incompatible library updates or changes in dependency behavior. A project may pin Python packages, automation modules, or other required components according to its operational requirements. Untracked scripts and random environments make troubleshooting harder, while manual dependencies reduce consistency. Reproducibility is especially important when the same automation workflow must operate reliably across development, testing, and production systems.

Question 199.

Which process checks whether deployed configuration matches intent?

1. Reconciliation
2. Fragmentation
3. Encapsulation
4. Translation

Correct Answer: 1

Explanation:

Reconciliation checks actual infrastructure state against an intended state and identifies differences that may require correction. After deploying network configuration, an automation workflow can retrieve operational or configuration information and compare it with the defined target state. If a mismatch is detected, the workflow can report the discrepancy or take an approved corrective action. Fragmentation divides data, encapsulation wraps information within protocol structures, and translation converts information between representations. Reconciliation is therefore an important mechanism for maintaining consistency after automated changes.

Question 200.

Which practice helps ensure automation changes are traceable?

1. Shared passwords
2. Version-controlled commits
3. Unnamed scripts
4. Manual notes

Correct Answer: 2

Explanation:

Version-controlled commits provide a structured history of changes made to automation code. Each commit can identify the contributor, timestamp, modified files, and accompanying message, creating useful traceability for development and operational review. Teams can use this history to investigate defects, review modifications, compare versions, and restore earlier implementations when necessary. Shared passwords and unnamed scripts provide no reliable change history, while manual notes may be incomplete or inconsistent. Maintaining automation in a version-control system is therefore an important practice for collaborative and auditable network engineering.