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290 AT-TQ2403 - Management Software - User's Guide
T
TCP
The Transmission Control Protocol (TCP) is built on top of Internet Protocol (IP). It adds reliable
communication (guarantees delivery of data), flow-control, multiplexing (more than one simultaneous
connection), and connection-oriented transmission (requires the receiver of a packet to acknowledge
receipt to the sender). It also guarantees that packets will be delivered in the same order in which they were
sent.
TCP/IP
The Internet and most local area networks are defined by a group of protocols. The most important of these
is the Transmission Control Protocol over Internet Protocol (TCP/IP), the de facto standard protocols.
TCP/IP was originally developed by Defense Advanced Research Projects Agency (DARPA, also known as
ARPA, an agency of the US Department of Defense).
Although TCP and IP are two specific protocols, TCP/IP is often used to refer to the entire protocol suite
based upon these, including ICMP, ARP, UDP, and others, as well as applications that run upon these
protocols, such as telnet, FTP, etc.
TKIP
The Temporal Key Integrity Protocol (TKIP) provides an extended 48-bit initialization vector, per-packet
key construction and distribution, a Message Integrity Code (MIC, sometimes called "Michael"), and a re-
keying mechanism. It uses a RC4 stream cipher to encrypt the frame body and CRC of each 802.11 frame
before transmission. It is an important component of the WPA and 802.11i security mechanisms.
U
UDP
The User Datagram Protocol (UDP) is a transport layer protocol providing simple but unreliable datagram
services. It adds port address information and a checksum to an IP packet.
UDP neither guarantees delivery nor does it require a connection. It is lightweight and efficient. All error
processing and retransmission must be performed by the application program.
Unicast
A Unicast sends a message to a single, specified receiver. In wireless networks, unicast usually refers to an
interaction in which the access point sends data traffic in the form of IEEE 802.1x Frames directly to a single
client station MAC address on the network.
Some wireless security modes distinguish between how unicast, multicast, and broadcast frames are
encrypted or whether they are encrypted.
See also Multicast and Broadcast.
URL
A Uniform Resource Locator (URL) is a standard for specifying the location of objects on the Internet, such
as a file or a newsgroup. URLs are used extensively in HTML documents to specify the target of a hyperlink
which is often another HTML document (possibly stored on another computer). The first part of the URL
indicates what protocol to use and the second part specifies the IP address or the domain name where that
resource is located.