User’s Manual of WGR-500-4P and WGR-500-4PV
101
TCP is an acronym for
T
ransmission
C
ontrol
P
rotocol. It is a communications protocol that uses the
Internet Protocol (IP) to exchange the messages between computers.
The TCP protocol guarantees reliable and in-order delivery of data from sender to receiver and
distinguishes data for multiple connections by concurrent applications (for example, Web server and
e-mail server) running on the same host.
The applications on networked hosts can use TCP to create connections to one another. It is known as a
connection-oriented protocol, which means that a connection is established and maintained until such
time as the message or messages to be exchanged by the application programs at each end have been
exchanged. TCP is responsible for ensuring that a message is divided into the packets that IP manages
and for reassembling the packets back into the complete message at the other end.
Common network applications that use TCP include the World Wide Web (WWW), e-mail, and File
Transfer Protocol (FTP).
TELNET
TELNET is an acronym for
TEL
etype
NET
work. It is a terminal emulation protocol that uses the
Transmission Control Protocol (TCP) and provides a virtual connection between TELNET server and
TELNET client.
TELNET enables the client to control the server and communicate with other servers on the network. To
start a Telnet session, the client user must log in to a server by entering a valid username and password.
Then, the client user can enter commands through the Telnet program just as if they were entering
commands directly on the server console.
U
UDP
UDP is an acronym for
U
ser
D
atagram
P
rotocol. It is a communications protocol that uses the Internet
Protocol (IP) to exchange the messages between computers.
UDP is an alternative to the Transmission Control Protocol (TCP) that uses the Internet Protocol (IP).
Unlike TCP, UDP does not provide the service of dividing a message into packet datagrams, and UDP
doesn't provide reassembling and sequencing of the packets. This means that the application program
that uses UDP must be able to make sure that the entire message has arrived and is in the right order.
Network applications that want to save processing time because they have very small data units to
exchange may prefer UDP to TCP.
UDP provides two services not provided by the IP layer. It provides port numbers to help distinguish
different user requests and, optionally, a checksum capability to verify that the data arrived intact.
Common network applications that use UDP include the Domain Name System (DNS), streaming media
applications such as IPTV, Voice over IP (VoIP), and Trivial File Transfer Protocol (TFTP).
UPnP
UPnP is an acronym for
U
niversal
P
lug and
P
lay. The goals of UPnP are to allow devices to connect
seamlessly and to simplify the implementation of networks in the home (data sharing, communications,
and entertainment) and in corporate environments for simplified installation of computer components
