01
True or false
1 point
A switch-to-switch Ethernet trunk can carry traffic for multiple VLANs while keeping their Layer 2 traffic logically separate. True or false?
Free Practice Quiz Question List
2 Trunking and VLAN Transport Online Quiz Questions
Use this free practice quiz with 20 questions to review 2 Trunking and VLAN Transport, test your knowledge, and prepare for your next test or exam.
20 questions
02
True or false
1 point
If VLAN 20 is added to a trunk's allowed VLAN list, that action alone creates and activates VLAN 20 on the switch. True or false?
- A
True
- B
False
03
Fill in the blank
1 point
On Cisco switches, untagged traffic is assigned to the native VLAN, which is by default.
04
Written response
1 point
What trunk setting determines which VLANs are permitted to use the link?
05
Choose one
1 point
A trunk allows VLANs 10, 20, and 30. VLAN 40 exists on both switches, but a device in VLAN 40 cannot communicate across the trunk. What best explains the problem?
- A
The traffic crosses because the VLAN exists on both switches.
- B
The traffic does not cross because VLAN 40 is omitted from the allowed list.
- C
The traffic crosses only if VLAN 40 is configured as the native VLAN.
- D
The traffic does not cross because a trunk can carry only three VLANs.
06
Fill in the blank
1 point
To see which interfaces are trunking and which VLANs are allowed and active, enter .
07
Choose one
1 point
On a platform where trunk negotiation is not needed or supported, which Cisco IOS-style command can disable DTP frames?
- A
switchport mode trunk - B
switchport nonegotiate - C
switchport trunk allowed vlan all - D
switchport trunk native vlan 1
08
Written response
1 point
In the configuration example, how many VLAN IDs are listed in switchport trunk allowed vlan 10,20,30,99?
09
Choose one
1 point
Which command in the example assigns VLAN 99 as the trunk's native VLAN?
- A
switchport native vlan 99 - B
switchport trunk native vlan 99 - C
switchport trunk allowed vlan 99 - D
vlan 99 native
10
Choose all
1 point
A VLAN cannot communicate across a trunk. Which checks are part of the recommended troubleshooting sequence? Select all correct choices.
- A
Confirm that the physical link is up and inspect cabling or interface errors.
- B
Verify that both interfaces operate compatibly as trunks and that their native VLANs match.
- C
Check that the required VLAN is allowed on both ends of the trunk.
- D
Confirm that the VLAN exists and is active on the switch.
- E
Change the VLAN ID on every end device before checking the trunk.
11
Choose all
1 point
Which commands can directly check whether a VLAN exists and is active, and inspect a port's mode, native VLAN, and allowed VLANs? Select all correct choices.
- A
show vlan brief - B
show running-config interface gigabitEthernet 1/0/1 - C
show interfaces interface-id switchport - D
show interfaces trunk
12
Open ended
1 point
Two switches are connected by a trunk. One end uses VLAN 99 as its native VLAN and the other end uses VLAN 1. Explain what setting should be checked and corrected, and describe a possible consequence of leaving the mismatch in place.
13
True or false
1 point
A Cisco trunk has just been configured, and no allowed VLAN list has been set. Is it generally true that Cisco trunks commonly allow all VLANs by default?
- A
True
- B
False
14
Choose one
1 point
A receiving switch reads an 802.1Q tag on a frame arriving over a trunk. Which information in the tag helps the switch keep the frame in the correct VLAN?
- A
It identifies the switch that originally sent the frame.
- B
It identifies the VLAN for the frame and carries priority information.
- C
It specifies the IP subnet to which the frame must be routed.
- D
It records which VLANs are allowed on the trunk.
15
Written response
1 point
Which Cisco IOS-style command can you use to check whether a required VLAN exists and is active on a switch?
16
Choose one
1 point
A Cisco trunk is using its default native VLAN setting. An untagged frame arrives on the trunk. Which VLAN is assigned to that traffic?
- A
The frame is discarded because every frame on a trunk must be tagged.
- B
The frame is assigned to VLAN 99, the usual native VLAN.
- C
The frame is assigned to VLAN 1, the default native VLAN.
- D
The frame is assigned to the first VLAN in the allowed list.
17
Choose one
1 point
VLAN 40 exists on both switches, but the trunk between them allows only VLANs 10, 20, and 30. What happens to VLAN 40 traffic across this trunk?
- A
VLAN 40 crosses because it exists on both switches.
- B
VLAN 40 traffic does not cross because it is not in the trunk's allowed list.
- C
VLAN 40 crosses only if it is configured as the native VLAN.
- D
VLAN 40 traffic is automatically added to the allowed list.
18
Written response
1 point
On a Cisco IOS-style switch, what interface command sets a port to trunk mode?
19
Choose one
1 point
A switch platform supports only 802.1Q trunking. When configuring a trunk on this platform, what is true about a separate encapsulation command?
- A
A separate encapsulation command is always required before trunk mode can be set.
- B
The trunk must use DTP to select its encapsulation.
- C
A separate encapsulation command is not required on a platform that supports only 802.1Q.
- D
The switch cannot form a trunk unless the native VLAN is VLAN 1.
20
Choose one
1 point
Two switches form a trunk, but their native VLAN settings do not match. Which outcome is a recognized risk of this mismatch?
- A
It can cause connectivity problems and may contribute to spanning-tree loops.
- B
It automatically adds the native VLAN to both ends' allowed lists.
- C
It prevents the trunk from carrying any tagged frames.
- D
It changes the VLAN ID inside every frame to match the receiving switch.
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