N10-009 SW1 and SW2 VLAN Trunking Practice Questions

Common Traps on SW1 and SW2 VLAN Trunking Practice Questions

·A VLAN must exist and be allowed on the trunk before traffic can cross the link.
·Access ports and trunk ports solve different problems.
·Native VLAN mismatch and allowed VLAN lists are common causes of confusing trunk behaviour.

Sample Questions

A network engineer is designing a new switched network and needs to ensure that broadcast traffic from one department does not reach another department's workstations. The engineer plans to use VLANs. Which of the following must be configured on the switches to isolate broadcast domains as intended?

Explanation: VLANs create separate broadcast domains. To isolate traffic, each department's workstations should be placed in a distinct VLAN. Access ports are assigned to a specific VLAN and do not forward traffic from other VLANs. Trunk ports carry multiple VLANs, but the broadcast isolation is achieved by assigning ports to the correct VLAN.

A network engineer is designing a network for a large organization. The engineer needs to ensure that broadcast traffic from one VLAN does not propagate to other VLANs while still allowing inter-VLAN communication. Which of the following devices is required to route between VLANs?

Explanation: A router or a Layer 3 switch is required to route traffic between VLANs. A switch alone only forwards within the same VLAN. A firewall can also route but is primarily security-focused. The question emphasizes routing between VLANs, which is done by a router (or Layer 3 switch). A bridge operates at Layer 2 and does not route between VLANs.

A network engineer is implementing VLANs for a company. The finance department's workstations are connected to switch ports configured as access ports in VLAN 20. The finance server is located in a different building and is connected to a second switch. The two switches are interconnected via a trunk link. What must be configured on the trunk link to allow finance workstations to communicate with the finance server?

Explanation: Trunk ports carry traffic for multiple VLANs using IEEE 802.1Q tagging. For traffic from VLAN 20 to pass between switches, the trunk must be configured to allow VLAN 20. The native VLAN is used for untagged traffic and is unrelated to allowing specific VLANs. Configuring the trunk as an access port would defeat trunking. VLAN pruning is an optimization that removes unused VLANs, but the basic requirement is to permit the VLAN.

A network administrator is troubleshooting communication between two switches connected via a trunk port. The trunk link is up/up, but devices in VLAN 20 cannot communicate across the trunk. The administrator has verified that both switches have VLAN 20 created and that the access ports are configured correctly. Which command should the administrator run on each switch to verify the trunk's allowed VLAN list?

Explanation: When troubleshooting trunk links, 'show interfaces trunk' is the best command to quickly verify the allowed VLAN list, native VLAN, and trunking status. Other commands are less specific to trunk configuration.

A network administrator is configuring a trunk link between two switches. The link is up, but devices on VLAN 30 cannot communicate across the trunk. Devices on VLAN 10 and 20 can communicate. What should the administrator verify?

Explanation: A trunk link can restrict which VLANs are allowed to traverse it. If VLAN 30 is not in the allowed VLAN list on either switch, traffic from that VLAN will be dropped. The native VLAN mismatch (option A) would cause a different set of issues, typically with untagged frames. Trunk encapsulation (option B) is usually static (802.1Q) and not dynamically negotiated in modern networks. Port security (option D) would block specific MAC addresses, not an entire VLAN.

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Frequently asked questions

How do "SW1 and SW2 VLAN Trunking Practice Questions" appear on the real N10-009?

Practise switch scenarios involving SW1, SW2, VLANs, trunk links, allowed VLAN lists and show interfaces trunk output. These appear throughout the N10-009 and require you to apply your knowledge, not just recall facts.

How many scenario questions are on the N10-009 exam?

Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the N10-009. Practicing each scenario type ensures you're ready for any format.

Are these N10-009 scenario practice questions free?

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