Free Practice Quiz Question List

5 Layer 2 Switching Troubleshooting Scenarios Online Quiz Questions

Use this free practice quiz with 20 questions to review 5 Layer 2 Switching Troubleshooting Scenarios, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

When troubleshooting a Layer 2 failure, making one controlled change at a time can make it easier to identify the cause and reduce the risk of disrupting unrelated VLANs.

A
True
B
False

True or false

1 point

On an 802.1Q trunk, traffic belonging to the native VLAN is sent with a VLAN tag.

A
True
B
False

Choose one

1 point

PC-A is in VLAN 20 on SW1 and reaches its gateway through a trunk to SW2. Other VLANs work. The trunk is up, but its allowed list contains VLANs 10, 30, and 99 only. Which conclusion best explains the failure?

A
The trunk is carrying every VLAN because its status is trunking.
B
The trunk can be operational while VLAN 20 is excluded.
C
The access port must be changed to VLAN 99 because that is the native VLAN.
D
The VLAN 20 gateway must be moved to SW1.

Choose one

1 point

Two PCs in VLAN 30 communicate when connected to SW1, but a VLAN 30 PC on SW2 cannot reach them. VLAN 30 is active on SW1 but missing or inactive on SW2. What is the best next action?

A
Change the PCs on SW1 to a different VLAN.
B
Create or activate VLAN 30 on SW2, then verify it is allowed on the inter-switch trunk.
C
Disable spanning tree on SW2.
D
Configure the trunk as an access port.

Choose one

1 point

A trunk between SW1 and SW2 reports an STP native-VLAN inconsistency. The operational native VLAN is 99 on SW1 and 1 on SW2. Which correction addresses the underlying mismatch?

A
Disable STP on both switches.
B
Configure the intended native VLAN consistently at both ends of the trunk.
C
Force both trunk ports to forward for every VLAN.
D
Remove all VLANs from the trunk's allowed list.

Choose all

1 point

On SW2, show spanning-tree vlan 10 reports Gi0/2 as Altn BLK while Gi0/1 is Root FWD. Select all conclusions supported by this evidence.

A
The port may be a redundant alternate path held out of forwarding to prevent a loop.
B
The port is necessarily faulty because every link should forward.
C
The blocking state can be normal when redundant Layer 2 paths exist.
D
Forcing the port to forward without checking the topology risks creating a loop.

Choose all

1 point

A PC cannot communicate even with devices in its local VLAN. Its access port is assigned to the intended VLAN, but no endpoint MAC address appears in the dynamic MAC table. Select all useful next checks.

A
Check the physical link and endpoint NIC.
B
Check port security or other interface restrictions.
C
Replace the trunk's native VLAN immediately.
D
Check whether the endpoint is transmitting.

Open ended

1 point

PC-A is assigned to VLAN 20 on SW1. Its gateway is reached through Gi0/1 to SW2, and other VLANs work. The trunk is up but allows only VLANs 10, 30, and 99. Explain the correction you would make and how you would verify it without removing VLANs already required on the trunk.

Choose one

1 point

The STP root for VLAN 10 is not the switch intended by the network design. After verifying the design across relevant switches, which action is an appropriate way to influence root selection?

A
Set a deliberate lower STP priority on the intended root switch than on competing switches, then recheck the root ID and port roles.
B
Force every port on the intended root switch to forward.
C
Disable STP on the redundant links.
D
Raise the intended root switch's priority above all competing switches.

Choose one

1 point

Two PCs in VLAN 30 communicate when connected to SW1, but a VLAN 30 PC on SW2 cannot reach them. The VLAN is active on SW1 but missing on SW2. What should you do first on SW2?

A
Enable STP on SW2 and leave the VLAN unchanged.
B
Create or activate VLAN 30 on SW2, then verify it is allowed on the trunk.
C
Move the SW2 PC to a different VLAN without checking the trunk.
D
Replace the trunk with an access link.

Written response

1 point

Which IOS-style command shown in the material displays dynamically learned MAC addresses specifically on interface Fa0/3?

Choose one

1 point

A PC in VLAN 20 cannot reach its gateway through a trunk. The access port is assigned to VLAN 20, the trunk is up, and its allowed list is 10, 30, and 99. Which correction preserves the VLANs already required on the trunk?

A
Replace the allowed list with VLAN 20 only.
B
Change the native VLAN to 20 on both switches.
C
Add VLAN 20 to the existing allowed list.
D
Disable trunking and configure the link as an access port in VLAN 20.

True or false

1 point

True or false: After changing a Layer 2 configuration, one successful ping by itself verifies that the specific failure point has been corrected.

A
True
B
False

Written response

1 point

SW1 uses native VLAN 99, while SW2 uses native VLAN 1. What native VLAN ID must SW2 use to match SW1?

Choose one

1 point

SW1 and SW2 have two Layer 2 paths. On SW2, show spanning-tree vlan 10 reports Gi0/1 as Root FWD and Gi0/2 as Altn BLK. What is the best response to a user's expectation that both links should forward?

A
Force the port into forwarding so both links carry traffic.
B
Treat the blocking state as potentially normal and verify the intended topology and STP roles.
C
Disable STP on the VLAN.
D
Remove the VLAN from the switch.

Choose one

1 point

A PC cannot communicate even with devices in its local VLAN. Its access port is assigned to the intended VLAN, but no MAC address is learned on that port. What should you investigate next?

A
Change the trunk's native VLAN.
B
Force the access port into STP forwarding.
C
Check the physical link, endpoint NIC, port restrictions, and whether the endpoint is transmitting.
D
Add the endpoint's VLAN to every trunk before checking the access port.

Written response

1 point

A PC is connected to an access port assigned to VLAN 30, but its intended VLAN is 20. The VLAN and the rest of the path are configured correctly. What VLAN ID should the access port use?

Written response

1 point

A PC cannot communicate locally, and you want to check whether its switch port is in the expected access mode and VLAN. The interface is Fa0/3. What IOS-style command should you use?

Fill in the blank

1 point

An ordinary endpoint is connected directly to a switch port intended to carry one VLAN. Configure the port in mode and assign it to the endpoint's intended VLAN.

Fill in the blank

1 point

A PC cannot reach a device on another switch. To organize the investigation, trace the frame from the endpoint's , across any , to the .

5 Layer 2 Switching Troubleshooting Scenarios Online Quiz Questions

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