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245U-E Wireless Ethernet Modem User Manual
Rev Version 2.24
TCP
Transmission Control Protocol (TCP) is a protocol used along with the Internet
Protocol (IP) to send data in the form of individual units (called packets) between
computers over the Internet. While IP takes care of handling the actual delivery of
the data, TCP takes care of keeping track of the packets that a message is divided
into for efficient routing through the Internet. For example, when a webpage is
downloaded from a web server, the TCP program layer in that server divides the
file into packets, numbers the packets, and then forwards them individually to the
IP program layer. Although each packet has the same destination IP address, it may
get routed differently through the network. At the other end, TCP reassembles the
individual packets and waits until they have all arrived to forward them as single
message.
TCP/IP
The underlying technology behind the Internet and communications between
computers in a network. The first part, TCP, is the transport part, which matches
the size of the messages on either end and guarantees that the correct message
has been received. The IP part is the user’s computer address on a network. Every
computer in a TCP/IP network has its own IP address that is either dynamically
assigned at startup or permanently assigned. All TCP/IP messages contain the
address of the destination network as well as the address of the destination station.
This enables TCP/IP messages to be transmitted to multiple networks (subnets)
within an organization or worldwide.
VoIP
Voice over Internet Protocol (VoIP). Voice transmission using Internet Protocol to
create digital packets distributed over the Internet. VoIP can be less expensive than
voice transmission using standard analog packets over POTS (plain old telephone
service).
VPN
Virtual private network (VPN) is a type of technology designed to increase the
security of information transferred over the Internet. VPN can work with either
wired or wireless networks, as well as with dial-up connections over POTS. VPN
creates a private encrypted tunnel from the end user’s computer, through the local
wireless network, through the Internet, all the way to the corporate servers and
database.
WAN
Wide area network (WAN) is a communication system of connecting PCs and
other computing devices across a large local, regional, national or international
geographic area. Also used to distinguish between phone-based data networks and
Wi-Fi. Phone networks are considered WANs and Wi-Fi networks are considered
wireless local area networks (WLANs).
WEP
Wired Equivalent Privacy (WEP) is basic wireless security provided by Wi-Fi. In
some instances, WEP may be all a home or small-business user needs to protect
wireless data. WEP is available in 40-bit (also called 64-bit), or in 108-bit (also called
128-bit) encryption modes. As 108-bit encryption provides a longer algorithm that
takes longer to decode, it can provide better security than basic 40-bit (64-bit)
encryption.
Wi-Fi
Wireless fidelity (Wi-Fi) is an interoperability certification for wireless local area
network (LAN) products based on the Institute of Electrical and Electronics
Engineers (IEEE) 802.11 standard.