Cisco Updated 350-401 Exam Questions and Answers by zayyan

The correct answer is D. print(json_object[ " TABLE_intf " ][ " ROW_intf " ][0] [ " prefix " ]).

Parsing JSON output from Cisco devices

Using Python to extract structured data

Understanding how CLI output is converted into JSON format

The command used:

show ip int brief | json

returns structured JSON data.

The JSON hierarchy shown in the exhibit:

{

" TABLE_intf " : {

" ROW_intf " : [

{ " intf-name " : " Vlan100 " , " prefix " : " 192.168.10.1 " , ... },

{ " intf-name " : " Vlan200 " , " prefix " : " 192.168.20.1 " , ... },

...

]

}

}

Important Observations:

ROW_intf is a list (array) of interface objects.

Each object contains fields like " prefix " (IP address).

VLAN 100 is used for management and appears first in the list.

Python Code Analysis:

json.loads() converts JSON string into a Python dictionary → json_object

To access VLAN100 IP:

json_object[ " TABLE_intf " ][ " ROW_intf " ][0] [ " prefix " ]

Why Option D is Correct:

Uses the correct variable ( json_object )

Correctly navigates dictionary → list → element → key

Index [0] corresponds to Vlan100 (management VLAN)

A & B: Use json.dumps incorrectly (this function converts Python → JSON, not for accessing data)

C: Uses index [1] , which refers to Vlan200, not VLAN100

When working with Cisco JSON output:

Identify list vs dictionary

Use indexing for lists ( [0] )

Use keys for dictionaries ( [ " key " ] )

Correct Pattern:

json_object[ " parent " ][ " child " ][index] [ " field " ]