What is the default VLAN that is automatically assigned to interfaces on switches?

What is the default VLAN that is automatically assigned to interfaces on switches?

• A. VLAN 1
• B. VLAN 99
• C. VLAN 10
• D. VLAN 100

Answer: (A)

Untagged traffic on a switch port is placed into the port’s default VLAN. On most switches, that default is VLAN 1, so if you don’t assign a specific VLAN to an access port, it automatically belongs to VLAN 1. This gives a baseline for how traffic is grouped until you configure otherwise, and many devices treat VLAN 1 as the default/native VLAN for trunks as well. While you can change this default in configuration, VLAN 1 is the standard default, which is why it’s chosen here.

Untagged traffic on a switch port is placed into the port’s default VLAN. On most switches, that default is VLAN 1, so if you don’t assign a specific VLAN to an access port, it automatically belongs to VLAN 1. This gives a baseline for how traffic is grouped until you configure otherwise, and many devices treat VLAN 1 as the default/native VLAN for trunks as well. While you can change this default in configuration, VLAN 1 is the standard default, which is why it’s chosen here.