199
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.
TKIP
Temporal Key Integrity Protocol (TKIP) provides WPA with a data
encryption function. It ensures that a unique master key is
generated for each packet, supports message integrity and
sequencing rules and supports re-keying mechanisms.
triggers
Triggers are used to deal with application protocols that create
separate sessions. Some applications, such as NetMeeting, open
secondary connections during normal operations, for example, a
connection to a server is established using one port, but data
transfers are performed on a separate connection. A trigger tells the
device to expect these secondary sessions and how to handle
them.
Once you set a trigger, the embedded IP address of each incoming
packet is replaced by the correct host address so that NAT can
translate packets to the correct destination. You can specify
whether you want to carry out address replacement, and if so,
whether to replace addresses on TCP packets only, UDP packets
only, or both.
twisted pair
The ordinary copper telephone wiring 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 with two pairs. For Ethernet
LANs, a higher grade called Category 3 (CAT 3) is used for
10BASE-T networks, and an even higher grade called Category
5 (CAT 5) is used for 100BASE-T networks. See
10BASE-T,
100BASE-T, Ethernet
.
unnumbered interfaces
An unnumbered interface is an IP interface that does not have a
local subnet associated with it. Instead, it uses a
router-id
that
serves as the source and destination address of packets sent to
and from the router. Unlike the IP address of a normal interface,
the router-id of an unnumbered interface is allowed to be the
same as the IP address of another interface. For example, the
WAN unnumbered interface of your Mitel 1000 uses the same IP
address of the LAN interface (192.168.1.1).
The unnumbered interface is temporary – PPP or DHCP will
assign a ‘real’ IP address automatically.
upstream
The direction of data transmission from the user to the Internet.
USB
Universal Serial Bus
A serial interface that lets you connect units such as printers,
scanners, etc. to your computer by simply plugging them in.
VC
Virtual
Circuit
A connection from your DSL router to your ISP.
VCI
Virtual Circuit Identifier
Together with the Virtual Path Identifier (VPI), the VCI uniquely
identifies a VC. Your ISP will tell you the VCI for each VC they
provide. See
VC
.
