CompTIA Network+ Practice Test

What is the difference between a native VLAN and a default VLAN?

1. Both can add an 802.1Q header

2. The native VLAN connects switches without a tag, while the default VLAN is assigned by default

3. The default VLAN is dynamic while the native VLAN is static

4. The native VLAN can carry data traffic only

The correct answer is: The native VLAN connects switches without a tag, while the default VLAN is assigned by default

The distinction between a native VLAN and a default VLAN is significant in the context of VLAN configurations in networking. The native VLAN plays a crucial role in trunking protocols, particularly in Cisco networks, where it allows untagged traffic to pass through trunk links. When two switches are connected via a trunk link, any frames that are sent without an 802.1Q tagging will be associated with the native VLAN. This is vital because it enables network devices to communicate without additional configurations for the trunk. On the other hand, the default VLAN is essentially the VLAN that is assigned by default to all switch ports. For most switches, this default VLAN is VLAN 1. Ports that are not explicitly assigned to a different VLAN will belong to this default VLAN. It acts as the fallback configuration when no other VLAN is specified for a port. Thus, the correct answer highlights that the native VLAN is specifically tied to untagged traffic across trunk links, whereas the default VLAN is a general configuration that applies to unassigned switch ports. Understanding the specific roles of these VLAN types is crucial for proper network management and configuration.