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Router
A system responsible for making decisions about which of several paths network
(or Internet) traffic will follow. To do this, it uses a routing protocol to gain
information about the network and algorithms to choose the best route based on
several criteria known as "routing metrics.
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 (e.g. 255.255.255.0) 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, which must be
assigned by InterNIC).
TCP/IP, UDP
Transmission Control Protocol/Internet Protocol (TCP/IP) and Unreliable
Datagram Protocol (UDP). TCP/IP is the standard protocol for data transmission
over the Internet. Both TCP and UDP are transport layer protocol. TCP performs
proper error detection and error recovery, and thus is reliable. UDP on the other
hand is not reliable. They both run on top of the IP (Internet Protocol), a network
layer protocol.
TELNET
It is the virtual terminal protocol in the Internet suite of protocols. Allows users of
one host to log into a remote host and act as normal terminal users of that host.
VCI
Virtual Circuit Identifier is part of the ATM cell header. A VCI is a tag indicating
the channel over which a cell will travel. The VCI of a cell can be changed as it
moves between switches via Signaling.
VPI
Virtual Path Identifier is part of the ATM cell header. A VPI is a pipe for a number
of Virtual Circuits.
