Filter
Top Products
92 Glossary
SLP (Service Location Protocol) DA (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.
SMTP (Simple Mail Transfer Protocol) A protocol used to send and transfer mail. Its
ability to queue incoming messages is limited, so SMTP usually is used only to send
mail, and POP or IMAP is used to receive mail.
spam Unsolicited email; junk mail.
SSL (Secure Sockets Layer) An Internet protocol that allows you to send encrypted,
authenticated information across the Internet.
static IP address An IP address that is assigned to a computer or device once and is
never changed.
Stratum 1 An Internet wide, authoritative Network Time Protocol (NTP) server that
keeps track of the current UTC time. Other stratums are available (2, 3, and so forth);
each takes its time from a lower-numbered stratum server.
subnet A grouping on the same network of client computers that are organized by
location (different floors of a building, for example) or by usage (all eighth-grade
students, for example). The use of subnets simplifies administration.
TCP (Transmission Control Protocol) A method used along with the Internet Protocol
(IP) to send data in the form of message units between computers over the Internet. IP
takes care of handling the actual delivery of the data, and TCP takes care of keeping
track of the individual units of data (called packets) into which a message is divided for
efficient routing through the Internet.
TTL (time-to-live) The specified length of time that DNS information is stored in a
cache. When a domain name–IP address pair has been cached longer than the TTL
value, the entry is deleted from the name server’s cache (but not from the primary DNS
server).
TXT (text) record A DNS record type that stores a text string for a response to a DNS
query.
UCE (unsolicited commercial email) See spam.
LL2351.Book Page 92 Monday, September 8, 2003 2:47 PM