CCNA VLAN Quiz Questions And Answers
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Do you know everything about CCNA VLAN? To test your knowledge, you can take this CCNA VLAN quiz. In the study of networking, a VLAN is a term given to a group of devices connected to one or more local area networks which are configured to communicate as if attached to the same wire when in actual fact, they are connected to different LAN segments. If you are aware of all these facts, it will be very easy for you to ace this quiz. All the best!
- 1.
What are the benefits of using VLANs? (Select three)
- A.
Broadcast storms can be mitigated with less number of broadcast domains, thus adding in their sizes.
- B.
A higher level of network security can be reached by differentiating sensitive data traffic from other network traffic.
- C.
Port-based VLANs increase switch-port use efficient.
- D.
A more efficient usage of bandwidth can be achieved allowing a lot of logical networks to use the same network infrastructure.
- E.
Broadcast storms can be mitigated by adding the number of broadcast domains, thus reducing their sizes.
Correct Answer(s)
B. A higher level of network security can be reached by differentiating sensitive data traffic from other network traffic.
D. A more efficient usage of bandwidth can be achieved allowing a lot of logical networks to use the same network infrastructure.
E. Broadcast storms can be mitigated by adding the number of broadcast domains, thus reducing their sizes.Explanation
The benefits of using VLANs include a higher level of network security by separating sensitive data traffic, more efficient usage of bandwidth by allowing multiple logical networks to share the same infrastructure, and mitigating broadcast storms by reducing the size of broadcast domains.Rate this question:
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- 2.
VLAN 3 is not yet configured on your switch. What happens if you set the switchport access VLAN 3 command interface configuration mode?
- A.
The command is accepted and the respective VLAN is added to vlan.dat.
- B.
The command is rejected.
- C.
The command is accepted and you must configure the VLAN manually.
- D.
The port turns amber.
Correct Answer
A. The command is accepted and the respective VLAN is added to vlan.dat.Explanation
When you enter the "switchport access VLAN 3" command in interface configuration mode, the command is accepted by the switch. This means that the switch acknowledges the command and does not reject it. Additionally, the respective VLAN, in this case VLAN 3, is added to the vlan.dat file. The vlan.dat file is used by the switch to store the VLAN information, so adding the VLAN to this file means that it is now recognized and configured on the switch.Rate this question:
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- 3.
What are the advantages of VLANs? (Select three)
- A.
VLANs establish broadcast domains in switched networks.
- B.
VLANs utilize packet filtering to enhance network security.
- C.
VLANs provide a method of conserving IP addresses in large networks.
- D.
VLANs allow access to network services based on department, not physical location.
- E.
VLANs can greatly simplify adding, moving, or changing hosts on the network.
Correct Answer(s)
A. VLANs establish broadcast domains in switched networks.
D. VLANs allow access to network services based on department, not physical location.
E. VLANs can greatly simplify adding, moving, or changing hosts on the network.Explanation
VLANs establish broadcast domains in switched networks by dividing a network into smaller, isolated virtual networks. This helps to reduce network congestion and improve network performance. VLANs also allow access to network services based on department, not physical location, enabling better network management and security. Additionally, VLANs can greatly simplify adding, moving, or changing hosts on the network by allowing administrators to easily reconfigure VLAN memberships without physically rewiring the network.Rate this question:
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- 4.
On a corporate network, hosts on the same VLAN can communicate with each other, but they are unable to communicate with hosts on different VLANs. What is needed to allow communication between the VLANs?
- A.
A router with subinterfaces configured on the physical interface that is connected to the switch
- B.
A router with an IP address on the physical interface connected to the switch
- C.
A switch with an access link that is configured between the switches
- D.
A switch with a trunk link that is configured between the switches
Correct Answer
A. A router with subinterfaces configured on the physical interface that is connected to the switchExplanation
To allow communication between VLANs, a router with subinterfaces configured on the physical interface that is connected to the switch is needed. Subinterfaces allow the router to create multiple logical interfaces on a single physical interface, each associated with a different VLAN. This enables the router to route traffic between the VLANs and facilitate communication between hosts on different VLANs. Without the use of subinterfaces, the router would not be able to differentiate between VLANs and communication between them would not be possible.Rate this question:
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- 5.
Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports Fa0/13. An 802.1Q trunk is configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2, the native VLAN is not specified. What will happen in this scenario?
- A.
802.1Q giants frames could saturate the link.
- B.
VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames.
- C.
A native VLAN mismatch error message will appear.
- D.
VLAN 10 on CAT1 and VLAN 1 on CAT2 will send tagged frames.
Correct Answer
C. A native VLAN mismatch error message will appear.Explanation
In this scenario, a native VLAN mismatch error message will appear. This is because CAT1 has VLAN 10 chosen as the native VLAN, while CAT2 does not have a native VLAN specified. When there is a mismatch in the native VLAN configuration between switches connected via an 802.1Q trunk, an error message is generated to indicate the inconsistency. This error message alerts network administrators to the mismatch and prompts them to correct the configuration to ensure proper communication between the switches.Rate this question:
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- 6.
Which of the following are the benefits of VLANs? (Select three)
- A.
They increase the size of collision domains.
- B.
They allow logical grouping of users by function.
- C.
They can enhance network security.
- D.
They increase the size of broadcast domains while decreasing the number of collision domains.
- E.
They increase the number of broadcast domains while decreasing the size of the broadcast domains.
Correct Answer(s)
B. They allow logical grouping of users by function.
C. They can enhance network security.
E. They increase the number of broadcast domains while decreasing the size of the broadcast domains.Explanation
VLANs allow logical grouping of users by function, which helps in organizing and managing network resources more efficiently. They can enhance network security by isolating sensitive data and restricting access to specific VLANs. Additionally, VLANs increase the number of broadcast domains while decreasing their size, which helps in reducing network congestion and improving overall network performance.Rate this question:
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- 7.
A frame from VLAN1 of switch S1 is sent to switch S2, where the frame is received on VLAN2. What causes this behavior?
- A.
Trunk mode mismatches
- B.
Vlans that do not correspond to a unique IP subnet
- C.
Native vlan mismatches
- D.
Allowing only vlan 2 on the destination.
Correct Answer
C. Native vlan mismatchesExplanation
Native VLAN mismatches can cause this behavior. The native VLAN is used for untagged traffic on a trunk link. If the native VLAN on switch S1 is different from the native VLAN on switch S2, it can cause the frame from VLAN1 on S1 to be received on VLAN2 on S2. This is because the frame is being sent untagged and is being associated with the wrong VLAN on S2 due to the native VLAN mismatch.Rate this question:
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- 8.
Which statement about VLAN operation on Cisco Catalyst switches is true?
- A.
When a packet is received from an 802.1Q trunk, the vlan id can be determined from the source MAC address table.
- B.
Unknown unicast frames are retransmitted only to the ports that belong to the same vlan.
- C.
Ports between switches should be configured in access mode so that vlans can span across the ports.
- D.
Broadcast and multicast frames are retransmitted to ports that are configured on different vlan.
Correct Answer
B. Unknown unicast frames are retransmitted only to the ports that belong to the same vlan.Explanation
Unknown unicast frames are retransmitted only to the ports that belong to the same VLAN. This is because when a switch receives an unknown unicast frame, it floods the frame to all ports within the same VLAN, in order to find the destination MAC address. Once the switch learns the MAC address, it will only forward future frames with that destination MAC address to the specific port where the device is connected, reducing unnecessary traffic on other ports. This helps to optimize network performance and improve security.Rate this question:
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- 9.
Which two benefits are provided by creating VLANs? (Choose two)
- A.
Added security
- B.
Dedicated bandwidth
- C.
Provides segmentation
- D.
Allows switches to route traffic between subinterfaces
- E.
Contains collisions
Correct Answer(s)
A. Added security
C. Provides segmentationExplanation
Creating VLANs provides added security by separating network traffic into different virtual networks, making it more difficult for unauthorized users to access sensitive information. It also provides segmentation, allowing network administrators to logically group devices based on their function or department, which helps to improve network performance and manageability.Rate this question:
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- 10.
Assuming the default switch configuration, which VLAN range can be added, modified, and removed on a Cisco switch?
- A.
2 through 1001
- B.
1 through 1001
- C.
1 through 1002
- D.
2 through 1005
Correct Answer
A. 2 through 1001Explanation
By default, a Cisco switch supports VLANs in the range of 2 through 1001. VLANs can be added, modified, and removed within this range. This means that VLANs can be created and configured between VLAN 2 and VLAN 1001 on the switch.Rate this question:
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