116 GLOSSARY
SAP Service Access Point. A well-defined location that identifies the user of
services of a protocol entity.
segment A section of a LAN that is connected to the rest of the network using a
switch or bridge.
server A computer in a network that is shared by multiple endstations. Servers
provide endstations with access to shared network services such as
computer files and printer queues.
Service Levels Once traffic is classified, service levels can be applied to determine how
the Switch treats classified packets. The Switch offers some predefined
standard service levels, for example, best effort, business critical, network
control, and so on.
SLIP Serial Line Internet Protocol. A protocol that allows IP to run over a
serial line (console port) connection.
SMTP Simple Mail Transfer Protocol. An IETF standard protocol used for
transferring mail across a network reliably and efficiently (as defined in
RFC 821).
SNMP Simple Network Management Protocol. The current IETF standard
protocol for managing devices on an TCP/IP network.
Spanning Tree
Protocol (STP)
A bridge-based system for providing fault tolerance on networks. STP
works by allowing you to implement parallel paths for network traffic,
and ensure that redundant paths are disabled when the main paths are
operational and enabled if the main paths fail.
stack A group of network devices that are integrated to form a single logical
device.
standby port The port in a resilient link that takes over data transmission if the main
port in the link fails.
STP See Spanning Tree Protocol (STP).
subnet mask A subnet mask is used to divide the device part of the IP address into two
further parts. The first part identifies the subnet number. The second part
identifies the device on that subnet.
switch A device that interconnects several LANs to form a single logical LAN
that comprises of several LAN segments. Switches are similar to
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