174GLOSSARY
separated by periods. Devices and routers use the mask to identify the subnet on which a device resides.
switch A device which filters, forwards and floods packets based on the packet’s destination address. The switch learns the addresses associated with each switch port and builds tables based on this information to be used for the switching decision.
system descriptor A
TCP A layered set of communications protocols providing Telnet terminal emulation, FTP file transfer and other services for communication among a wide range of computer equipment.
TFTP Trivial File Transfer Protocol. Allows you to transfer files, such as software upgrades and configuration files, to and from a remote device.
TNCS Transcend® Network Control Services. A suite of
top N The top N components of your network are calculated using some appropriate sorting condition such as utilization or by total octets sent and received over a specified period. See Chapter 11, “Overview of Reporting”.
transport layer The fourth layer of the OSI network layer model. This is responsible for error checking and correction, and some message flow control.
tree See Object List.
UDP User Datagram Protocol. A protocol enabling an application to send individual messages to other applications.