Glossary

Ubiquiti UniFi and home networking terms, defined plainly — the vocabulary behind every access-point, VLAN, switching, and UniFi Protect guide we publish.

A

Access point (AP) access-points

A UniFi device providing Wi-Fi. Placement, count, and channel/power planning matter far more for real performance than the AP model number.

Adoption controller

The process of bringing a UniFi device under a controller's management. 'Adoption failed' or 'stuck adopting' is usually a Layer-2 reachability or controller-address (inform URL) problem.

C

Channel planning access-points

Assigning non-overlapping channels and appropriate widths across APs to limit co-channel interference. On 2.4 GHz this means channels 1/6/11 and 20 MHz width in most homes.

Channel width access-points

How much spectrum a Wi-Fi channel uses (20/40/80/160 MHz). Wider is faster in isolation but causes more interference in dense environments — narrower is often better with multiple APs.

F

Firewall rule (zone-based) network-design

A UniFi gateway rule controlling traffic between networks/zones. VLANs alone don't isolate anything until firewall rules block inter-VLAN traffic — the step most segmentation setups miss.

G

Gateway (UniFi router) network-design

The UniFi device that routes between networks and the internet and enforces firewall rules — a Dream Machine, Dream Router, or UXG/UDM-class device.

I

Inform URL controller

The address a UniFi device uses to reach its controller (default port 8080). Wrong or unreachable inform URLs are the most common cause of adoption failures on routed/self-hosted setups.

L

Layer 2 adoption controller

Adopting a device that's on the same broadcast domain as the controller, requiring no inform-URL configuration. The simplest path; cross-subnet adoption needs DHCP option 43 or DNS.

M

Minimum RSSI access-points

A signal-strength floor below which an AP nudges a client to disconnect, encouraging it to roam to a closer AP. A key setting for fixing 'sticky client' roaming in multi-AP homes.

P

PoE (Power over Ethernet) switching

Delivering power and data over one Ethernet cable. UniFi APs and cameras are typically PoE; matching the PoE standard (af/at/bt) and switch budget is required for stable operation.

Port profile switching

A reusable UniFi switch-port configuration defining the native network and which tagged VLANs are allowed. Applying the right profile is how you place a port on a specific VLAN.

Provisioning controller

The controller pushing configuration to an adopted device. A device cycling through 'provisioning' repeatedly typically indicates a config or connectivity issue, not a hardware fault.

R

Recording retention protect

How many days of UniFi Protect footage local storage can hold, driven by camera count, resolution, frame rate, and codec. Planning this before buying disks avoids constant overwrite.

S

Site (UniFi site) controller

A logical grouping of devices and settings within one controller. Lets one controller manage multiple physical locations independently.

T

Tagged vs untagged (native VLAN) switching

Tagged traffic carries an 802.1Q VLAN ID; untagged (native) traffic doesn't and is assigned to one VLAN by the port. Mixing these up is the usual reason a device lands on the wrong network.

See also: VLAN, Trunk port, Port profile

Trunk port switching

A switch/AP uplink port that carries multiple tagged VLANs. In UniFi terms, a port profile passing 'All' or a set of networks rather than a single native VLAN.

U

UniFi Console (Dream Machine / Cloud Key) controller

Ubiquiti hardware that runs the Network Application (and often UniFi Protect). A Dream Machine also routes; a Cloud Key only hosts the controller.

UniFi Network Application controller

The controller software that adopts, configures, and monitors all UniFi network devices. Runs on a UniFi console, self-hosted server, or container — it manages devices but isn't in the data path once they're provisioned.

UniFi Protect protect

Ubiquiti's video surveillance application running on a Protect-capable console, managing UniFi cameras and recording locally to attached storage.

V

VLAN network-design

A virtual LAN that logically separates devices on shared switching hardware. The core tool for isolating IoT, guest, and trusted devices on one UniFi network.