5. Explain the Benefits of Organizing Code into Methods / Functions, Classes, and Modules 200-901 Practice Questions (Page 7)

Questions 31–35

1. 31expert · hard

   A team is developing a Python application that manages network devices. They have a class 'Device' with attributes like 'hostname' and 'ip'. They also have a class 'DeviceManager' that performs operations on devices. The team wants to ensure that the 'Device' class does not directly depend on the 'DeviceManager' class, so that changes to the manager do not affect the device model. Which design principle is being applied?

   • ALow coupling between classes, so that changes in one class have minimal impact on another.
   • BEncapsulation of the Device attributes, so they are not directly accessible.
   • CInheritance from a base class to share common behavior.
   • DHigh cohesion within the Device class, so that all its methods are closely related.
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2. 32application · medium

   A network automation team is refactoring a large script that has grown to over 2,000 lines. The script contains device connection logic, data parsing, and report generation all mixed together. The team wants to improve collaboration so that multiple developers can work on different parts without merge conflicts. Which refactoring strategy is most effective?

   • AUse a version control system and require developers to work on the same branch.
   • BSplit the script into separate modules for connection, parsing, and reporting, each with a clear interface.
   • CAssign one developer to own the entire script and review all changes.
   • DKeep the script as one file but add detailed comments to each section.
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4. 33application · medium

   A network automation team is working on a large Python project. The project has multiple modules, and each module contains several functions. The team wants to improve code review efficiency by making it easier to identify which part of the code is responsible for a specific behavior. Which practice is most effective?

   • APut all functions in a single module and use comments to describe each function.
   • BOrganize functions into modules based on their responsibility, and give each module a clear name.
   • CUse long, descriptive function names that include the module name.
   • DCreate a separate module for each function.
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5. 34application · medium

   A team is developing a Python application that manages different types of network devices: routers, switches, and firewalls. Each device type has common attributes (hostname, IP) and some unique methods (e.g., routers have a method to configure OSPF, firewalls have a method to update security policies). The team wants to avoid duplicating common code while allowing each type to have its own behavior. Which design pattern is most appropriate?

   • ACreate a base class NetworkDevice with common attributes and methods, and subclasses Router, Switch, and Firewall that add specific methods.
   • BCreate a single class NetworkDevice with all methods for all device types, using conditionals to check the device type.
   • CUse a dictionary to store device data and write standalone functions for each operation.
   • DCreate separate modules for each device type and duplicate the common attributes in each module.
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6. 35application · medium

   A developer is designing a Python class to represent a network switch. The class should hide the details of how configuration is applied and expose a simple method called apply_config(config_string). Other parts of the code should not need to know whether the switch uses SSH or NETCONF. Which benefit of classes does this design primarily illustrate?

   • APolymorphism, because the method can accept different types of config strings.
   • BEncapsulation, because the class bundles data and methods together.
   • CAbstraction, because the class provides a simplified interface while hiding implementation details.
   • DInheritance, because the class inherits from a base class.
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