Practise switch scenarios involving SW1, SW2, VLANs, trunk links, allowed VLAN lists and show interfaces trunk output.
Start Scenario PracticeA network engineer runs the following command on Switch SW1: SW1# show etherchannel summary Flags: D - down P - bundled in port-channel I - stand-alone s - suspended H - Hot-standby (LACP only) R - Layer3 S - Layer2 U - in use N - not in use, no aggregation f - failed to allocate aggregator M - not in use, minimum links not met u - unsuitable for bundling w - waiting to be aggregated d - default port Number of channel-groups in use: 1 Number of aggregators: 1 Group Port-channel Protocol Ports ------+-------------+-----------+-------------------------------------------- 1 Po1(SU) LACP Gi0/1(P) Gi0/2(P) Gi0/3(D) Based on this output, what can be concluded?
Explanation: The output shows that Gi0/1 and Gi0/2 have a flag of 'P' (bundled in port-channel), while Gi0/3 has a flag of 'D' (down). Therefore, only two ports are actively bundled, making option D correct. The 'SU' flags on Po1 indicate the port-channel is Layer 2 (S) and in use (U), not Layer 3.
A network engineer is troubleshooting an STP issue in a network that uses Rapid PVST+. The network has a root bridge (SW1) and a secondary root bridge (SW2). The engineer notices that after a link failure between SW1 and SW2, the network takes longer than expected to converge. The engineer checks the configuration and finds that SW2 has the 'spanning-tree uplinkfast' command enabled. The engineer also notices that SW2 has a lower priority than SW1. What is the most likely cause of the slow convergence?
Explanation: UplinkFast is a legacy STP feature that is incompatible with Rapid PVST+. When enabled on a switch running Rapid PVST+, it forces the switch to revert to 802.1D STP convergence behavior on the affected ports, disabling the rapid transition mechanisms (such as proposal/agreement and sync). This causes the network to take longer to converge after a link failure, as the switch falls back to the slower listening and learning states.
An engineer is configuring RSPAN to monitor traffic from multiple switches in a data center. The monitoring station is connected to a central switch. The engineer has configured an RSPAN VLAN (VLAN 999) on all switches and set up the source sessions on the remote switches. However, the monitoring station receives no traffic. On the central switch, the engineer verifies that the RSPAN VLAN is active and that the destination session is configured. What is a likely missing configuration?
Explanation: RSPAN traffic is carried over an RSPAN VLAN that must be allowed on all trunk links between the source switches and the central switch. If the RSPAN VLAN (999) is not included in the allowed VLAN list on the trunk ports, the mirrored frames will be dropped, and the monitoring station will receive no traffic. This is the most likely missing configuration because the engineer verified the VLAN is active and the destination session is set, but did not check the trunk pruning.
A network engineer is configuring a Cisco switch for 802.1X port-based authentication. The switch is configured with a RADIUS server for authentication. The engineer wants to allow devices that fail 802.1X authentication to still access a limited guest VLAN. The engineer configures 'authentication port-control auto' and 'authentication host-mode multi-host' on the interface. However, when a non-802.1X-capable device is connected, the port remains in the unauthorized state and does not fall into the guest VLAN. What is missing?
Explanation: The 'authentication guest-vlan <vlan-id>' command is missing. This command explicitly defines the VLAN to which the port will assign devices that fail 802.1X authentication or are non-802.1X-capable. Without it, the switch has no configured fallback VLAN, so the port remains in the unauthorized state even with 'authentication port-control auto' and 'authentication host-mode multi-host' configured.
A network engineer runs the following command on Switch SW1: SW1# show interfaces gi0/1 switchport Name: Gi0/1 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk private VLANs: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Based on this output, what can be concluded?
Explanation: The output shows 'Negotiation of Trunking: On', which indicates that Dynamic Trunking Protocol (DTP) is enabled on the interface. DTP is a Cisco proprietary protocol used to negotiate trunking between switches. Since the interface is in trunk mode and DTP is on, option B is correct.
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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 350-401 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 350-401. Practicing each scenario type ensures you're ready for any format.
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