SMC Networks EZ Connect SMC2602W User Manual page 32

Subnet Mask - A subnet mask, which may be a part of the TCP/IP information provided by your
ISP, is a set of four numbers configured like an IP address. It is used to create IP address
numbers used only within a particular network (as opposed to valid IP address numbers
recognized by the Internet.
TCP/IP - Transmission Control Protocol/Internet Protocol. This is the standard protocol for data
transmission over the Internet.
TCP - Transmission Control Protocol - TCP and UDP (User Datagram Protocol) are the two
transport protocols in TCP/IP. TCP ensures that a message is sent accurately and in its entirety.
However, for real-time voice and video, there is really no time or reason to correct errors, and
UDP is used instead.
UDP - User Datagram Protocol - A protocol within the TCP/IP protocol suite that is used in place
of TCP when a reliable delivery is not required. For example, UDP is used for real-time audio and
video traffic where lost packets are simply ignored, because there is no time to retransmit. If
UDP is used and a reliable delivery is required, packet sequence checking and error notification
must be written into the applications.