3.9 Interaction with Network Devices Through APIs Using Basic Python Scripts CCIE-SECURITY Practice Questions (Page 10)

Questions 46–50

1. 46expert · medium

   A network automation script uses a requests.Session() to interact with a device's API. The API uses cookie-based session management after initial authentication. The script needs to maintain the session across multiple requests. Which practice is correct?

   • AUse the same session object for all requests; cookies are automatically persisted.
   • BStore the session ID in a global variable and add it to the URL.
   • CDisable cookies and use Basic Auth for every request.
   • DCreate a new session for each request and manually copy cookies.
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2. 47expert · medium

   A Python script is parsing a JSON response from a network device's API. The response contains a list of ACL entries, each with a 'source' field that may be missing. The script needs to extract the source IP for each entry, defaulting to 'any' if the field is absent. Which code snippet correctly handles this?

   • Asource = entry.get('source', 'any')
   • Bsource = entry['source'] if 'source' in entry else 'any'
   • Csource = entry['source']
   • Dsource = entry.get('source') or 'any'
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4. 48expert · hard

   A network engineer is using a NETCONF API to retrieve interface statistics. The API returns XML. The engineer needs to extract the 'in-octets' value for a specific interface. Which Python code snippet correctly parses the XML and extracts the value?

   • Aimport xml.etree.ElementTree as ET; root = ET.fromstring(xml_response); value = root.find('in-octets').text
   • Bimport re; value = re.search(r'<in-octets>(.*?)</in-octets>', xml_response).group(1)
   • Cimport xml.etree.ElementTree as ET; root = ET.fromstring(xml_response); value = root.find('.//in-octets').text
   • Dimport json; data = json.loads(xml_response); value = data['in-octets']
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5. 49expert · medium

   A security automation team maintains a YAML file that defines device connection parameters for multiple devices. The YAML file contains a list of devices, each with a name, IP, and credentials. The team wants to load this YAML in a Python script and iterate over the devices to establish connections. Which code snippet correctly loads the YAML and iterates?

   • Aimport yaml; with open('devices.yaml') as f: devices = yaml.safe_load(f)['devices']; for device in devices: print(device['name'])
   • Bimport json; with open('devices.yaml') as f: devices = json.load(f)['devices']; for device in devices: print(device['name'])
   • Cimport yaml; with open('devices.yaml') as f: devices = yaml.safe_load(f); for device in devices['devices']: print(device['name'])
   • Dimport yaml; with open('devices.yaml') as f: devices = yaml.load(f); for device in devices: print(device['name'])
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6. 50expert · hard

   A network engineer is designing a Python script to interact with a network device's REST API. The API is stateless and requires the client to include all necessary information in each request. The engineer needs to update a specific interface description. Which approach aligns with RESTful principles?

   • ASend a GET request to retrieve the interface, modify the response, and send it back with PUT.
   • BSend a POST request to the root URI with the full interface configuration.
   • CSend a PATCH request to the interface URI with a JSON body containing only the description field.
   • DSend a DELETE request to the interface URI and then POST a new one.
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