These are the questions most candidates get wrong. They require connecting multiple concepts, reading tricky output, or knowing edge-case behaviour that isn't on most study cards. Practising them trains you to operate under uncertainty — a necessary skill on the real exam.
Start Scenario PracticeAn engineer is using EEM on an IOS XE device. They want to trigger an applet when a specific syslog message appears. Which event trigger type should they use?
Explanation: The 'event syslog pattern' trigger in EEM (Embedded Event Manager) is specifically designed to fire an applet when a syslog message matching a regex pattern is logged. It watches the device's syslog stream and activates the applet when the pattern matches. This is the canonical trigger for reacting to specific log events on IOS XE.
A network engineer is configuring EtherChannel between two switches. The switches are connected via four links. The engineer wants to load balance traffic based on source and destination IP addresses. Which configuration command should be used on Cisco IOS?
Explanation: The command 'port-channel load-balance src-dst-ip' configures EtherChannel to use both the source and destination IP addresses in the hash algorithm, which is exactly what the engineer needs for load balancing based on source and destination IP addresses. This ensures traffic distribution across the four links by computing a hash on the combination of source and destination IPs, providing a balanced distribution for IP traffic.
A network automation engineer is evaluating options for model-driven programmability on Cisco devices. Which THREE are valid YANG model sources or tools? (Choose three.)
Explanation: pyang is a YANG tool, yangcatalog.org is a repository, and Cisco native models are valid sources. OpenConfig is a standard, but oc-interfaces is a model, not a source/tool.
An engineer is exploring YANG models for network interfaces. They need a vendor-neutral model that can be used across multiple device types. Which YANG model should they use?
Explanation: OpenConfig interfaces is a vendor-neutral YANG model developed by the OpenConfig working group, which aims to provide standardized data models that work across multiple vendors and device types. Unlike vendor-specific models, OpenConfig models are designed to be implemented consistently on different platforms, enabling multi-vendor automation and management. Therefore, for a vendor-neutral model usable across multiple device types, OpenConfig interfaces is the correct choice.
A network administrator is deploying a custom container application on a Cisco Catalyst 9300 switch running IOS XE 16.12. The application is packaged as a .tar file and installed using 'app-hosting install app myapp flash:myapp.tar'. The administrator configures the app-hosting context as follows: app-hosting app myapp app-default-gateway 192.168.1.1 app-vnic gateway0 guest-interface 0 guest-ipaddress 192.168.1.10 netmask 255.255.255.0 app-resource profile custom cpu 1000 memory 2048 storage 5000 The administrator also creates a virtual port group 'vg0' and assigns it to the management interface. The application fails to start with the error: 'Application failed to start: guest interface not ready'. The administrator verifies that the .tar file is valid, the resources are sufficient, and the gateway is reachable. What is the most likely cause of the failure?
Explanation: The error 'guest interface not ready' indicates that the virtual network interface defined in the app-hosting configuration is not properly linked to a virtual port group on the switch. In IOS XE, the 'app-vnic gateway0 guest-interface 0' command must be associated with a virtual port group (e.g., 'vpg vg0') using the 'guest-interface 0' binding under the virtual port group configuration. Without this binding, the guest interface remains uninitialized, preventing the container from starting.
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Practice all Hard Difficulty QuestionsThese are the questions most candidates get wrong. They require connecting multiple concepts, reading tricky output, or knowing edge-case behaviour that isn't on most study cards. Practising them trains you to operate under uncertainty — a necessary skill on the real exam. These appear throughout the 200-901 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 200-901. Practicing each scenario type ensures you're ready for any format.
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