Practise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command.
Start Scenario PracticeA network administrator is troubleshooting a switch that is experiencing high CPU utilization. The administrator suspects a switching loop. Which command should be used to verify whether Spanning Tree Protocol has blocked any ports to prevent a loop?
Explanation: Spanning Tree Protocol prevents loops by blocking redundant ports. When a loop is suspected, checking STP status is essential. The show spanning-tree command provides detailed information about port roles and states, including which ports are blocking. If STP is functioning correctly, it will have blocked ports to break the loop, though high CPU may still occur during topology changes.
Users on VLAN 20 report that they can reach servers on VLAN 30 but cannot reach any hosts on VLAN 40. The administrator confirms that inter-VLAN routing is configured on a Layer 3 switch with switched virtual interfaces for all three VLANs. Which action should the administrator take first to isolate the problem?
Explanation: Because routing between VLAN 20 and VLAN 30 already works, the Layer 3 switch is functioning as a router. The fault is specific to VLAN 40, so the logical first check is whether its switched virtual interface is up and correctly addressed. An SVI stays down when the VLAN has no active member ports or when the VLAN itself has not been created.
A network administrator is configuring a switch port that connects to a server. The administrator wants to ensure that the port does not participate in Spanning Tree Protocol (STP) and immediately transitions to the forwarding state when the link comes up. Which feature should be configured on this port?
Explanation: PortFast is the correct feature because it allows an access port to skip the STP listening and learning states and go straight to forwarding, which is ideal for server connections. BPDU Guard, Root Guard, and Loop Guard are STP enhancement features that protect the topology but do not provide immediate forwarding.
A network technician is troubleshooting intermittent connectivity to a server. The technician suspects a duplex mismatch on a switch port connected to the server. Which command should be used to check the duplex setting and error statistics on the switch port?
Explanation: A duplex mismatch often causes late collisions, FCS errors, and runts on the side configured for half-duplex. The show interfaces command provides duplex mode and error counters for a specific interface. By examining these statistics, the technician can confirm whether a mismatch exists and take corrective action, such as setting both sides to auto-negotiate or matching duplex settings manually.
Refer to the exhibit. A technician is verifying the hardware installed in a switch. What type of media is required to connect to the 'Te1/1/1' interface based on the SFP type shown?
Explanation: The 'Te1/1/1' interface naming indicates a 10 Gigabit Ethernet port, and the SFP type shown in the exhibit is a multi-mode fiber SFP (typically with an OM3/OM4 LC connector and a wavelength like 850 nm). Multi-mode fiber is used for short-reach 10G connections up to ~300–400 m, which matches the SFP's design. Therefore, a multi-mode fiber optic cable is required.
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Practice all Which Command Should the Administrator Use Practice QuestionsPractise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command. These appear throughout the 100-150 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 100-150. Practicing each scenario type ensures you're ready for any format.
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