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300-435 · Question #76

Refer to the exhibit. What is the expected output from the Python code? ``python Simple Application to run a few commands on a Cisco Device ipaddresses = ["192.168.0.1", "192.168.0.5"…

The correct answer is D. Logging into 192.168.0.1, using admin/cisco123 Executing show ver on device: 192.168.0.1 Executing show ip interface brief on device: 192.168.0.1 Logging into 192.168.0.5, using admin/cisco123 Executing show ver on device: 192.168.0.5 Executing show ip interface brief on device: 192.168.0.5 Logging into 10.10.10.10, using admin/cisco123 Executing show ver on device: 10.10.10.10 Executing show ip interface brief on device: 10.10.10.10. The Python code iterates through a list of IP addresses and then, for each IP, it iterates through a list of commands, printing a login message for the device and then an execution message for each command.

Device-Level Network Automation

Question

Refer to the exhibit. What is the expected output from the Python code?
# Simple Application to run a few commands on a Cisco Device
ipaddresses = ["192.168.0.1", "192.168.0.5", "10.10.10.10"]
username = "admin"
password = "cisco123"
commands_to_run=["show ver", "show ip interface brief"]
Debug = True

for device in ipaddresses:
 print ("Logging into "+device+", using "+username+"/"+password)
 # We want to execute commands on our device only if Debug=True
 for commands_to_run:
 print (" Executing "+commands+" on device: "+device)

Options

  • ALogging into 192.168.0.1, using admin/cisco123 Logging into 192.168.0.5, using admin/cisco123 Logging into 10.10.10.10, using admin/cisco123 Executing show ver on device: 192.168.0.1 Executing show ip interface brief on device: 192.168.0.1 Executing show ver on device: 192.168.0.5 Executing show ip interface brief on device: 192.168.0.5 Executing show ver on device: 10.10.10.10 Executing show ip interface brief on device: 10.10.10.10
  • BLogging into 192.168.0.1, using admin/cisco123 Logging into 192.168.0.5, using admin/cisco123 Logging into 10.10.10.10, using admin/cisco123
  • CSimple Application to run a few commands on a Cisco Device Loggig into 192.168.0.1, using admin/cisco123 We want to execute commands on our device only if Debug=True Executing show ver on device: 192.168.0.1 Executing show ip interface brief on device: 192.168.0.1 Logging into 192.168.0.5, using admin/cisco123 We want to execute commands on our device only if Debug=True Executing show ver on device: 192.168.0.5 Executing show ip interface brief on device: 192.168.0.5 Logging into 10.10.10.10, using admin/cisco123 We want to execute commands on our device only if Debug=True Executing show ver on device: 10.10.10.10 Executing show ip interface brief on device: 10.10.10.10
  • DLogging into 192.168.0.1, using admin/cisco123 Executing show ver on device: 192.168.0.1 Executing show ip interface brief on device: 192.168.0.1 Logging into 192.168.0.5, using admin/cisco123 Executing show ver on device: 192.168.0.5 Executing show ip interface brief on device: 192.168.0.5 Logging into 10.10.10.10, using admin/cisco123 Executing show ver on device: 10.10.10.10 Executing show ip interface brief on device: 10.10.10.10

How the community answered

(41 responses)
  • A
    2% (1)
  • B
    2% (1)
  • C
    10% (4)
  • D
    85% (35)

Why each option

The Python code iterates through a list of IP addresses and then, for each IP, it iterates through a list of commands, printing a login message for the device and then an execution message for each command.

ALogging into 192.168.0.1, using admin/cisco123 Logging into 192.168.0.5, using admin/cisco123 Logging into 10.10.10.10, using admin/cisco123 Executing show ver on device: 192.168.0.1 Executing show ip interface brief on device: 192.168.0.1 Executing show ver on device: 192.168.0.5 Executing show ip interface brief on device: 192.168.0.5 Executing show ver on device: 10.10.10.10 Executing show ip interface brief on device: 10.10.10.10

This output incorrectly shows all login messages first, then all command execution messages, which does not reflect the nested loop structure where commands are executed per device.

BLogging into 192.168.0.1, using admin/cisco123 Logging into 192.168.0.5, using admin/cisco123 Logging into 10.10.10.10, using admin/cisco123

This output only shows the login messages and omits the command execution messages entirely, failing to account for the inner loop.

CSimple Application to run a few commands on a Cisco Device Loggig into 192.168.0.1, using admin/cisco123 We want to execute commands on our device only if Debug=True Executing show ver on device: 192.168.0.1 Executing show ip interface brief on device: 192.168.0.1 Logging into 192.168.0.5, using admin/cisco123 We want to execute commands on our device only if Debug=True Executing show ver on device: 192.168.0.5 Executing show ip interface brief on device: 192.168.0.5 Logging into 10.10.10.10, using admin/cisco123 We want to execute commands on our device only if Debug=True Executing show ver on device: 10.10.10.10 Executing show ip interface brief on device: 10.10.10.10

This output includes comments from the code as part of the execution flow, which is incorrect as comments are ignored by the Python interpreter.

DLogging into 192.168.0.1, using admin/cisco123 Executing show ver on device: 192.168.0.1 Executing show ip interface brief on device: 192.168.0.1 Logging into 192.168.0.5, using admin/cisco123 Executing show ver on device: 192.168.0.5 Executing show ip interface brief on device: 192.168.0.5 Logging into 10.10.10.10, using admin/cisco123 Executing show ver on device: 10.10.10.10 Executing show ip interface brief on device: 10.10.10.10Correct

The code uses a nested loop structure: an outer loop iterates through each IP address in `ipaddresses`, and an inner loop (implicitly iterating `for command in commands_to_run` despite the syntax error `for commands_to_run:`) iterates through each command. For each device, the script prints a login message, then for each command in the list, it prints an execution message, following the order of the loops.

Concept tested: Python list iteration and nested loops

Source: https://docs.python.org/3/tutorial/controlflow.html#for-statements

Topics

#Python#For Loops#Scripting Basics#String Manipulation

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