3. Describe the Use and Roles of Network Simulation and Test Tools (such as Cisco Modeling Labs and pyATS) 200-901 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A network engineer is writing a pyATS script to validate that a new QoS policy is applied correctly on multiple routers. The engineer wants to reuse the same test logic for different sets of routers and generate a summary report. Which pyATS components should the engineer use?

   • AA single Python script that hardcodes the router IPs and prints results to the console.
   • BA testcase with reusable test sections, and a job file that specifies which devices to run against.
   • CA testbed file that contains the QoS configuration for each router.
   • DA CML topology file that defines the QoS policy.
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A network engineer has written a pyATS testcase that verifies OSPF neighbor states on a set of routers. The engineer wants to run this testcase against different device groups (core, edge, and branch) without duplicating the test logic. What is the most efficient way to achieve this?

   • ACopy the testcase into separate files for each device group and modify the device list in each copy.
   • BModify the testcase to include conditional logic that skips devices based on their hostname.
   • CUse a single job file that hardcodes the IP addresses of all devices.
   • DCreate multiple job files, each referencing the same testcase but with a different testbed or device selection.
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   Which role does Cisco Modeling Labs (CML) play in the network testing process?

   • AIt analyzes packet captures to identify security threats
   • BIt provides a platform for building virtual network topologies to test and validate configurations
   • CIt monitors network performance in real time using SNMP
   • DIt automatically deploys configurations to physical devices
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A network automation engineer is developing a new BGP peering configuration for a customer edge router. The engineer wants to validate the configuration against a realistic topology before deploying to production. The engineer has access to Cisco Modeling Labs (CML) and pyATS. Which approach best uses these tools together to validate the configuration?

   • AUse pyATS to generate the configuration and then manually paste it into a physical lab router for testing.
   • BBuild the topology in CML, deploy the candidate configuration to the virtual routers, and run a pyATS job that connects to the CML nodes to verify BGP peering and routing tables.
   • CCreate the topology in CML and use the built-in CML traffic generator to verify BGP peering without involving pyATS.
   • DRun a pyATS job directly against the production router using the candidate configuration, then roll back if tests fail.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A network automation team needs to validate that all routers in a lab environment have consistent OSPF neighbor states and that no unexpected routing loops exist. They want to write Python-based tests that can be reused across different device models. Which tool is designed for this type of network test automation?

   • ApyATS
   • BNetmiko
   • CPostman
   • DCML
   Reveal Solution Discussion Select an answer first