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Appendix
Subnet
A subnet is a portion of a network. The subnet is distinguished from the larger
network by a subnet mask which selects some of the computers of the network
and excludes all others. The subnet's computers remain physically connected
to the rest of the parent network, but they are treated as though they were on a
separate network. See also network mask.
Subnet mask
A mask that defines a subnet. See also network mask.
TCP (See TCP/IP)
TCP/IP (Transmission Control Protocol/Internet Protocol)
The basic protocols used on the Internet. TCP is responsible for dividing data
up into packets for delivery and reassembling them at the destination, while IP
is responsible for delivering the packets from source to destination. When TCP
and IP are bundled with higher-level applications such as HTTP, FTP, Telnet,
etc., TCP/IP refers to this whole suite of protocols.
Telnet
An interactive, character-based program used to access a remote computer.
While HTTP (the web protocol) and FTP only allow you to download files
from a remote computer, Telnet allows you to log into and use a computer from
a remote location.
TFTP (Trivial File Transfer Protocol)
A protocol for file transfers, TFTP is easier to use than File Transfer Protocol
(FTP) but not as capable or secure.
TTL (Time To Live)
A field in an IP packet that limits the life span of that packet. Originally meant
as a time duration, the TTL is usually represented instead as a maximum hop
count; each router that receives a packet decrements this field by one. When
the TTL reaches zero, the packet is discarded.
Twisted pair
The ordinary copper telephone wiring long used by telephone companies. It
contains one or more wire pairs twisted together to reduce inductance and
noise. Each telephone line uses one pair. In homes, it is most often installed
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