Avocent Network Device SPC420 - Manual (Page 419)

Appendices 399
TCP is one of the main protocols in TCP/IP networks. The IP protocol deals only with packets.
TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees
delivery of data and that packets will be delivered in the same order in which they were sent.
Telnet session
A Telnet Viewer session is a type of target device session in which the target device supports
Telnet and the DSView 3 software client connects directly to the target device using Telnet.
Telnet Viewer
This applet is a software component that provides the user interface needed to display a remote
target device through serial over IP sessions.
Tiered switch
A tiered switch is also known as a cascade switch. See the definition of cascade switch.
UDP (User Datagram Protocol)
UDP is a connectionless protocol that runs on top of IP networks like TCP. Unlike TCP/IP,
UDP/IP provides very few error recovery services, offering instead a direct way to send and
receive datagrams over an IP network. UDP is primarily used for broadcasting messages over a
network.
Unit
Unit is a generic term that refers to either a target device, managed appliance, blade chassis or
a component in a virtual environment. For example, the Unit List may contain both target
devices and managed appliances.
Video Viewer
The Video Viewer is a software component that provides the user interface needed to display a
remote target device through KVM over IP sessions.
VPN (Virtual Private Network)
VPN is a means of implementing a private network on a public network such as the Internet.
By encrypting data and assigning addresses, the impression is given to networks at each end of
the VPN that they are connected by a private physical network instead of across a public
network.
(WAN) Wide Area Network
WAN typically refers to a network that is distributed at multiple sites and connected by a
relatively slow link between the sites. The WAN is frequently implemented using a VPN on
the Internet.
(WAS) Web Application Server
WAS is software that runs on a server that is capable of executing web applications. The WAS
software typically contains or works with a web (HTTP) server.
(Webapp) Web Application
Webapps are groups of server-side Web resources that make up an interactive online
application. The web resources include Java servlets, JavaServer Pages
™ (JSPs), static