HOTSPOT GATEWAY
338 Glossary of Terms
Static IP Address
An IP address that is assigned to a computing device permanently (or until the user changes it manually),
unlike a dynamic IP address which is assigned to a device temporarily by the DHCP server. See also,
DHCP, IP Address and Dynamic IP Address.
STP
(Spanning Tree Protocol) A link management protocol that is part of the IEEE 802.1 standard for media
access control bridges. Using the spanning tree algorithm, STP provides path redundancy while preventing
undesirable loops in a network that are created by multiple active paths between stations. Loops occur when
there are alternate routes between hosts. To establish path redundancy, STP creates a tree that spans all of
the switches in an extended network, forcing redundant paths into a standby (or blocked) state. STP allows
only one active path at a time between any two network devices (this prevents the loops) but establishes the
redundant links as a backup if the initial link should fail. If STP costs change, or if one network segment in
the STP becomes unreachable, the spanning tree algorithm reconfigures the spanning tree topology and
reestablishes the link by activating the standby path. Without spanning tree in place, it is possible that both
connections may be simultaneously “live,” which could result in an endless loop of traffic on the LAN.
Subnet
A portion of a network, which may be a physically independent network segment, which shares a network
address with other portions of the network and is distinguished by a unique subnet address. In general, a
subnet is to a network what a network is to the Internet.
Subnet Address
The subnet portion of an IP address that is dedicated to the subnet. In a subnetted network, the host portion
of an IP address is split into a subnet portion and a host portion using an address (subnet) mask. See also, IP
Address and Subnet.
Subnet Mask
See Subnet Address.
Subscriber
Any person or organization that pays a period fee for services.
SYSLOG
(SYStem LOGging) Syslog is the standard event logging subsystem for Unix and consists of a server
daemon, a client function library, and a client command line utility. You can log to files, terminal devices,
logged on users, or even forward to other syslog systems. See also, Daemon.
TCP
(Transmission Control Protocol) Manages data into small packets and ensures that the data is transmitted
correctly over a network. If an error is detected, the data is transmitted again in its original form. See also,
TCP/IP.
TCP/IP
(Transmission Control Protocol/Internet Protocol). A suite of protocols that regulates data communications
for the Internet. See also, Internet Protocol, Protocol, and TCP.
Telnet
A software program and command utility used to connect between remote locations and services. Telnet
connects you to the login prompt of another host (that you have access rights to). See also, Host.
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