CCNA VLAN Quiz Questions And Answers

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.