These questions describe a network symptom and ask you to identify the root cause or the correct fix. They appear across all certification exams and reward systematic thinking over memorisation. The best candidates follow a consistent troubleshooting framework even under time pressure.
Start Scenario PracticeA network engineer is troubleshooting connectivity issues and wants to verify the path that packets take from a source to a destination IP address. Which OSI layer is primarily responsible for packet forwarding and routing?
Explanation: The Network layer (Layer 3) is responsible for packet forwarding and routing, using logical IP addresses to determine the best path from source to destination. Protocols like IP (IPv4/IPv6) and routing protocols (e.g., OSPF, BGP) operate at this layer to make forwarding decisions. The traceroute command is a common tool that leverages Layer 3 TTL (Time-to-Live) fields to map the path packets take.
A DevOps team uses GitLab CI to deploy a containerized application to a Kubernetes cluster. The deployment pipeline fails at the 'deploy' stage with an error: 'unable to connect to server'. What is the most likely cause?
Explanation: The error 'unable to connect to server' indicates that the GitLab CI runner cannot establish a TCP connection to the Kubernetes API server. This is most commonly caused by a missing or invalid kubeconfig file, which contains the cluster endpoint, credentials, and context required by kubectl to authenticate and communicate with the cluster. Without a valid kubeconfig, the deployment stage cannot proceed.
An engineer is troubleshooting packet loss between two hosts on different subnets. The traceroute shows that packets reach the first hop router but then stop. The router's ARP table shows an incomplete entry for the next-hop IP address. What is the most likely cause?
Explanation: An incomplete ARP entry for the next-hop IP address indicates that the router sent an ARP request but received no reply. This typically means the next-hop device is unreachable at Layer 2, often because it is powered off, has a failed interface, or there is a cabling issue. Since traceroute shows packets reaching the first hop but not beyond, the Layer 2 failure at the next hop is the most direct cause.
Refer to the exhibit. A developer from subnet 10.10.10.0/24 cannot reach the RESTCONF API on the IOS-XE device. What is the most likely cause?
Explanation: The access-class configured under the RESTCONF API restricts incoming connections to specific subnets. Since the developer is on subnet 10.10.10.0/24, which is not listed in the permit statement, all HTTPS requests from that subnet are dropped before reaching the API. This is the most direct cause of the connectivity failure.
A network engineer is troubleshooting a connectivity issue between two hosts in different VLANs on the same switch. The hosts are in VLAN 10 and VLAN 20, respectively. The switch has an SVI for each VLAN and IP routing is enabled. Which command should be used to verify that the switch is forwarding traffic between the VLANs?
Explanation: 'show ip route' displays the switch's routing table, which contains the directly connected subnets for VLAN 10 and VLAN 20 (via their SVIs) and any learned routes. Since IP routing is enabled, the switch uses this table to make forwarding decisions between VLANs. Verifying that both VLAN subnets appear in the routing table confirms that the switch can route traffic between them.
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Practice all Troubleshooting Scenario QuestionsThese questions describe a network symptom and ask you to identify the root cause or the correct fix. They appear across all certification exams and reward systematic thinking over memorisation. The best candidates follow a consistent troubleshooting framework even under time pressure. 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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