Practise switch scenarios involving SW1, SW2, VLANs, trunk links, allowed VLAN lists and show interfaces trunk output.
Start Scenario PracticeA company uses a /24 subnet for its office LAN. The network must accommodate 30 hosts per VLAN. Which subnet mask would be most efficient for each VLAN while minimizing wasted IP addresses?
Explanation: A /27 subnet mask (255.255.255.224) provides 32 total addresses per subnet, with 30 usable host addresses (2^5 - 2 = 30). This exactly meets the requirement of 30 hosts per VLAN without wasting IP addresses, as any larger subnet would leave unused addresses.
A network automation engineer needs to retrieve the Layer 2 topology for a specific VLAN from Cisco DNA Center. Which API endpoint should be used?
Explanation: The endpoint GET /dna/intent/api/v1/topology/l2/{vlanID} is used to retrieve Layer 2 topology for a VLAN.
A network engineer needs to automate the configuration of VLANs on a set of Cisco switches using Ansible. Which API should be targeted to ensure idempotent configuration updates?
Explanation: NETCONF/YANG is the correct choice because NETCONF provides a transactional, lock-based mechanism that ensures idempotent configuration updates—applying the desired state exactly once without side effects from repeated runs. YANG models define the VLAN configuration structure, allowing Ansible to compare the current device state against the desired state and only push changes when necessary, which is the essence of idempotency.
A network engineer is tasked with segmenting a large broadcast domain into smaller ones using VLANs. In the OSI model, at which layer does a VLAN operate?
Explanation: VLANs operate at Layer 2 (Data Link) of the OSI model because they segment broadcast domains by tagging Ethernet frames with VLAN IDs (802.1Q). This allows logical separation of networks without regard to physical location, and switches use MAC addresses to forward frames within VLANs. Layer 2 is where framing, MAC addressing, and VLAN tagging occur.
A network administrator configures a switch port to belong to VLAN 10. Which OSI layer is primarily involved in VLAN tagging?
Explanation: VLAN tagging is defined in IEEE 802.1Q, which operates at Layer 2 (Data Link) of the OSI model. The 802.1Q tag is inserted into the Ethernet frame header, and switches use this tag to make forwarding decisions within the same broadcast domain. Therefore, VLAN tagging is primarily a Layer 2 function.
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Practice all SW1 and SW2 VLAN Trunking Practice QuestionsPractise switch scenarios involving SW1, SW2, VLANs, trunk links, allowed VLAN lists and show interfaces trunk output. 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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