Practise switch scenarios involving SW1, SW2, VLANs, trunk links, allowed VLAN lists and show interfaces trunk output.
Start Scenario PracticeA switch is configured with RSPAN to monitor traffic from VLAN 50 to a remote switch via VLAN 200. The source switch has: monitor session 1 source vlan 50 rx monitor session 1 destination remote vlan 200. The remote switch has: monitor session 2 source remote vlan 200 monitor session 2 destination interface Gi0/2. The intermediate switches have VLAN 200 configured with 'remote-span'. The network uses VTP transparent mode. The analyzer connected to Gi0/2 sees intermittent traffic. The RSPAN VLAN 200 is also used as a native VLAN on some trunk ports. What is the likely cause of intermittent traffic?
Explanation: When the RSPAN VLAN is also configured as the native VLAN on a trunk, mirrored frames are sent untagged on that trunk. Intermediate switches may treat untagged frames as belonging to the native VLAN rather than the RSPAN VLAN, causing them to be forwarded incorrectly or dropped, resulting in intermittent traffic at the destination.
An engineer is troubleshooting a network where IPv6 hosts on VLAN 20 are unable to communicate with each other. The switch is configured with IPv6 First Hop Security features including Private VLAN (PVLAN) and IPv6 Source Guard. The hosts are in the same VLAN but cannot ping each other. What is the most likely cause?
Explanation: Private VLAN (PVLAN) on VLAN 20 isolates ports within the same VLAN, preventing direct communication between hosts on isolated ports. Even though the hosts share the same VLAN, PVLAN restricts traffic so that isolated ports can only communicate with a promiscuous port (e.g., a router uplink), not with each other. This directly explains why IPv6 hosts on VLAN 20 cannot ping each other.
What is missing from this RSPAN configuration on a switch? monitor session 1 source interface GigabitEthernet1/0/1 both monitor session 1 destination remote vlan 100 Assume VLAN 100 exists but is not configured as an RSPAN VLAN.
Explanation: For RSPAN to work, the VLAN used as the destination remote VLAN must be configured with the 'remote-span' command. Without it, the session will not function correctly.
An engineer applies an IPv6 ACL to filter traffic between two VLANs on a switch using a router-on-a-stick configuration. The ACL is applied inbound on the subinterface. Traffic from VLAN 10 to VLAN 20 is permitted, but return traffic from VLAN 20 to VLAN 10 is dropped. Which is the most likely explanation?
Explanation: In a router-on-a-stick configuration, traffic from VLAN 10 to VLAN 20 is permitted by the inbound ACL on the VLAN 10 subinterface. However, return traffic from VLAN 20 to VLAN 10 must traverse the VLAN 20 subinterface inbound (or the VLAN 10 subinterface outbound). If the ACL is applied inbound only on the VLAN 10 subinterface, return traffic from VLAN 20 is not inspected unless an ACL is also applied inbound on the VLAN 20 subinterface or outbound on the VLAN 10 subinterface. The most likely cause is that the ACL on the VLAN 20 subinterface is missing a permit entry for the return traffic, or the ACL is applied outbound on VLAN 10, which does not affect incoming return traffic.
An engineer configures an RSPAN session on a Cisco switch to monitor traffic from VLAN 30 and send it to a remote switch. The engineer creates RSPAN VLAN 200 on both switches and configures the trunk to allow VLAN 200. On the remote switch, the engineer configures the destination port as GigabitEthernet0/4 in VLAN 200. The engineer notices that the destination port is forwarding traffic, but the traffic is not from the source VLAN 30; instead, it is broadcast traffic from other VLANs. What is the most likely cause?
Explanation: The RSPAN VLAN (200) is a dedicated transport VLAN that must not carry any regular user or broadcast traffic. If VLAN 200 is also assigned to access ports or allowed on trunks carrying other VLANs, the destination monitor port will receive that unrelated traffic instead of only the mirrored source VLAN 30 traffic. The symptom described — destination port forwarding broadcast traffic from other VLANs — is the classic sign that the RSPAN VLAN is being shared with production traffic.
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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 300-410 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 300-410. Practicing each scenario type ensures you're ready for any format.
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