3Com 3CBLSG48 User Guide - Page 226

appendix F: gLOSSARY 215 Spanning Tree A technology that checks your network for any loops. A loop can often Protocol (STP) occur in complicated or backup linked network systems. Spanning Tree detects and directs data along the shortest available path, maximizing the performance and efficiency of the network. Terminal Access TACACS+ is a logon authentication protocol that uses software Controller Access running on a central server to control access to TACACS-compliant Control System Plus devices on the network. (TACACS+) Transmission Control Protocol/Internet Protocol (TCP/IP) Protocol suite that includes TCP as the primary transport protocol, and IP as the network layer protocol. Trivial File Transfer A TCP/IP protocol commonly used for software downloads. Protocol (TFTP) User Datagram UDP provides a datagram mode for packet-switched communications. Protocol (UDP) It uses IP as the underlying transport mechanism to provide access to IP-like services. UDP packets are delivered just like IP packets - connection-less datagrams that may be discarded before reaching their targets. UDP is useful when TCP would be too complex, too slow, or just unnecessary. Virtual LAN (VLAN) A Virtual LAN is a collection of network nodes that share the same collision domain regardless of their physical location or connection point in the network. A VLAN serves as a logical workgroup with no physical barriers, and allows users to share information and resources as though located on the same LAN. XModem A protocol used to transfer files between devices. Data is grouped in 128-byte blocks and error-corrected.