Specifications

318 Glossary
session The period of time during which two programs, or two users running
programs, communicate across a network. For example, when a user logs in to a file
server, a session is initiated that continues until the user logs out or the session is
terminated by the file service.
Session Description Protocol See SDP.
shadow image A file created by the NetBoot daemon process for each NetBoot client
where applications running on the client can write temporary data.
shadow password A password that’s stored in a secure file on the server and can be
authenticated using a variety of conventional authentication methods required by the
different services of Mac OS X Server. The authentication methods include APOP,
CRAM-MD5, DHX, LAN Manager, NTLMv1, NTLMv2, and WebDAV-Digest.
share See share point.
share point A folder, hard disk (or hard disk partition), or optical disc that’s accessible
over the network. A share point is the point of access at the top level of a group of
shared items. Share points can be shared using AFP, SMB, NFS (an export), or FTP.
shared secret A value defined at each node of an L2TP VPN connection that serves as
the encryption key seed to negotiate authentication and data transport connections.
short name An abbreviated name for a user. The short name is used by Mac OS X for
home folders, authentication, and email addresses.
Simple Mail Transfer Protocol See SMTP.
Simple Network Management Protocol See SNMP.
SLP DA Service Location Protocol Directory Agent. A protocol that registers services
available on a network and gives users easy access to them. When a service is added to
the network, the service uses SLP to register itself on the network. SLP DA uses a
centralized repository for registered network services.
SMB Server Message Block. A protocol that allows client computers to access files and
network services. It can be used over TCP/IP, the Internet, and other network protocols.
SMB services use SMB to provide access to servers, printers, and other network
resources.
SMTP Simple Mail Transfer Protocol. A protocol used to send and transfer mail. Its
ability to queue incoming messages is limited, so SMTP is usually used only to send
mail, and POP or IMAP is used to receive mail.
SNMP Simple Network Management Protocol. A set of standard protocols used to
manage and monitor multiplatform computer network devices.