Intermec WA21 System Manual page 291

Glossary
root access point
The access point with the highest root priority becomes the root of the
network spanning tree. If the root becomes inactive, the remaining root
candidates negotiate to determine which access point becomes the new
root. The root can be used to set system-wide flooding and RF parameters.
The root is also the only node in the network that can originate IP
tunnels.
root port
The access point port that provides the inbound connection to the
spanning tree. The root port provides a link to a parent access point. Note
that a root access point does not have a root port.
root IP subnet
Also called the home IP subnet and primary LAN. The IP subnet that
contains the root access point. If wireless end devices need to roam
between IP subnets, each end device needs to have an IP address from the
root IP subnet.
secondary bridging
Ethernet bridging on a non-root port. An access point that is the
designated bridge for a secondary LAN uses secondary bridging to bridge
frames to and from the secondary LAN on a non-root port.
secondary LAN
Any LAN that is reached by routing traffic through an access point.
Wireless end devices that are communicating through a WAP comprise a
secondary LAN. A remote IP subnet is a type of secondary LAN.
service set
A logical (not physical) radio. You can create up to four service sets for
each physical 802.11g and 802.11a radio in an access point. Each service
set shares the same physical radio configuration (including the parameters
set for Advanced Configuration and Inbound Filters). Each service set has
a unique SSID (network name), and you may customize its security
configuration and member limit. Multiple service sets are used primarily
to allow one radio to support multiple VLANs.
SNAP
A protocol extension typically used by AppleTalk networks.
MobileLAN access WA2X System Manual 277