5. Explain the Benefits of Organizing Code into Methods / Functions, Classes, and Modules 200-901 Practice Questions (Page 6)

Questions 26–30

1. 26expert · hard

   A network automation engineer is troubleshooting a Python script that configures multiple devices. The script has a function that sends configuration commands, but sometimes it fails on certain devices due to authentication errors. The engineer wants to add logging to the function to capture which device failed and why, without affecting the rest of the script. What is the best approach?

   • AUse a global variable to store the last error and check it after each call.
   • BLet the function raise an exception and handle it in the main script with a generic message.
   • CAdd print statements around each call to the function to show the device IP.
   • DAdd try-except inside the function to catch authentication errors and log the device IP and error message.
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2. 27application · medium

   A junior developer on your team writes a Python script that configures interfaces. The script contains a 200-line block of code that validates IP addresses, and this block appears in several places. The senior developer asks the junior to refactor the script. What is the primary benefit of extracting that block into a function named 'validate_ip'?

   • AThe script will run faster because the function is compiled once.
   • BThe function will automatically handle all possible input types.
   • CThe function can be tested independently and reused in other scripts.
   • DThe script will no longer require any imports.
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4. 28expert · hard

   A network automation engineer maintains a Python script that configures hundreds of devices. The script currently has a single function that performs all steps: connect, parse config, apply changes, and verify. The engineer needs to add a new verification method that only applies to a subset of devices. The team also wants to unit-test the verification logic without connecting to real devices. What is the best refactoring approach?

   • AAdd an if statement inside the existing function to check the device type and apply the new verification method.
   • BCreate a new script that duplicates the existing function and adds the new verification method.
   • CUse a global variable to indicate whether to run the new verification method.
   • DBreak the monolithic function into smaller functions for each step, and pass a device object to the verification function.
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5. 29foundation · easy

   What is a primary benefit of using modules in a Python project?

   • AModules eliminate the need for version control.
   • BModules allow the code to run without a Python interpreter.
   • CModules automatically make the code run faster.
   • DModules allow code to be reused across different projects without copying and pasting.
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6. 30application · medium

   A team develops a Python library that manages network devices. They want to prevent external code from directly modifying the device's hostname attribute, and instead require validation before any change is applied. Which object-oriented programming feature best supports this requirement?

   • AAbstraction by hiding the entire class behind an interface.
   • BPolymorphism by defining multiple methods with the same name.
   • CInheritance by creating a subclass that overrides the attribute.
   • DEncapsulation by making the attribute private and providing a setter method that validates input.
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