Technical data

TheTimeToLive(TTL)ofanIPpacket.Validvaluesarefrom1to255inclusive.
time daemon
The program running on a host that synchronizes the host’s hardware clock
to Coordinated Universal Time in accordance with the protocols known as the
Network Time Protocol.
timeo
A timeout option for the NFS
mount
command.
TN3270
TELNET options that allows TELNET users to connect to hosts that support 3270
model terminals.
Token Ring
A type of LAN that has stations wired in a ring, where each station constantly
passes a special message (a "token") on to the next; technically referred to as
IEEE 802.5.
topology
The architecture of a network. A network topology shows the computers and the
links between them within a network.
TOS (type of service)
An IP header field that specifies the importance of a datagram and how to make
tradeoffs between delay, throughput, reliability, and cost when the datagram
travels across a network. The parameters are mapped into actual service
parameters for the particular networks the datagram crosses.
traffic
The measurement of data flow, volume, and velocity over a communications link.
transceiver
Transmitter-receiver; a physical device required in baseband networks that takes
the digital signal from a computer or terminal and imposes it on the baseband
medium; connects a host interface to a LAN, such as Ethernet.
transient information
Network management information carried in an operation; is meaningful only
while the operation is being performed.
transit network
A network that passes traffic between networks in addition to carrying traffic for
its own hosts; must have multiple connections to the internet.
Transmission Control Protocol (TCP)
A Transport layer protocol that provides the reliable, full-duplex, stream service
on which many application protocols depend. TCP allows a process on one host to
send a stream of data to a process on another. It is connection-oriented in the sense
that before transmitting data, participants must establish a connection.
Transmission Control Protocol/Internet Protocol (TCP/IP)
The acronym for the suite of application and transport protocols that run over IP,
su ch a s FT P, T EL NE T, a nd UCP, as w el l as T CP a nd I P.
Transport layer
The layer in the TCP/IP architecture model where network traffic is passed
between an application on one host and an application on another host.
Glossary–46