VLAN

Virtual Local Area Network.

PIF (Physical InterFace)

Defines the physical port of a piece of equipment.

PVID (Parent Vlan IDentification) / PVLAN (Parent VLAN)

Defines the default VLAN for traffic leaving a specified interface. Also referred to as Native Network, Parent VLAN. Untagged traffic will be tagged with this ID leaving the port.

VIF (Virtual InterFace)

Defines a virtual port of a piece of equipment; Commonly swapped with VLAN or VID.

PVIF (Parent Virtual InterFace)

Defines a parent virtual port of a piece of equipment; Commonly swapped with PVLAN or PVID.

VID (Vlan IDentification)

Defines a virtual port of a piece of equipment; must be associated with a PIF. Commonly used interchangeably with VLAN, VIF.

VLAN (Virtual Local Area Network)

A virtual network, creating logical separations within a switch. This allows for multiple broadcast domains on the switch.

VLAN Attributes:

L2 (layer 2).
Independent Broadcast Domain.
Configured with 802.1Q.
VLANIDs: 0-4095.
VLANID: 1 is generally used as a management VLAN with no VLAN tags.

VLANID (Virtual Local Area Network IDentification)

Integer number between 0-4095 identifying a specific VLAN.

ALL (All Networks)

Concept used to denote ALL VLANS and untagged traffic. Typically used in defining Trunks. If ALL is not used, then untagged traffic must be explicitly allowed.

Tagged

Network packet that has already been tagged with the 802.1Q header, identifying that packet as being on a specific VLAN.

Untagged

Network packet that does not have the 802.1Q header. This is standard network traffic. Also commonly referred to as the Native VLAN.

Management VLAN (Default)

VLAN used for general management and administration; not typically for everyday data traffic. In common practice, the management VLAN is usually Untagged traffic to allow for un-configured devices the ability to be connected to when added to the network. Some devices (like Ubiquiti) treat the Management VLAN, Untagged traffic, and Native VLAN as VLANID 1. May be referred to as Default network.

Native VLAN (Native Network)

Synonym for Untagged. Standard network traffic to allow for un-configured devices the ability to be connected to when added to the network. Some devices (like Ubiquiti) treat the Management VLAN, Untagged traffic, and Native VLAN as VLANID 1.

Trunk

Used for upstream or downstream links between switches and routers. Accepts and forwards traffic on multiple VLANS, usually including Untagged traffic.