User Guide

PMP 450 Planning Guide Glossary
pmp-0047 (December 2012)
XI
Term Definition
TCP Alternatively known as Transmission Control Protocol or Transport Control Protocol.
The Transport Layer in the TCP/IP protocol stack. This protocol is applied to assure
that data packets arrive at the target network element and to control the flow of data
through the Internet. Defined in RFC 793. See http://www.faqs.org/rfcs/rfc793.html
.
TDD Time Division Duplexing. Synchronized data transmission with some time slots
allocated to devices transmitting on the uplink and some to the device transmitting on
the downlink.
telnet Utility that allows a client computer to update a server. A firewall can prevent the use
of the telnet utility to breach the security of the server. See
http://www.faqs.org/rfcs/rfc818.html, http://www.faqs.org/rfcs/rfc854.html
and
http://www.faqs.org/rfcs/rfc855.html.
Textual
Conventions MIB
Management Information Base file that defines system-specific textual conventions.
See also Management Information Base.
Tokens Theoretical amounts of data. See also Buckets.
TOS 8-bit field in that prioritizes data in a IP transmission. See
http://www.faqs.org/rfcs/rfc1349.html
.
TxUnderrun Field This field displays how many transmission-underrun errors occurred on the Ethernet
controller.
UDP
User Datagram Protocol. A set of Network, Transport, and Session Layer protocols that
RFC 768 defines. These protocols include checksum and address information but does
not retransmit data or process any errors. See
http://www.faqs.org/rfcs/rfc768.html.
udp User-defined type of port.
U-NII Unlicensed National Information Infrastructure radio frequency band, in the 5.1-GHz
through 5.8-GHz ranges.
VID VLAN identifier. See also VLAN.
VLAN Virtual local area network. An association of devices through software that contains
broadcast traffic, as routers would, but in the switch-level protocol.
VPN Virtual private network for communication over a public network. One typical use is to
connect remote employees, who are at home or in a different city, to their corporate
network over the Internet. Any of several VPN implementation schemes is possible.
SMs support L2TP over IPSec (Level 2 Tunneling Protocol over IP Security) VPNs
and PPTP (Point to Point Tunneling Protocol) VPNs, regardless of whether the
Network Address Translation (NAT) feature enabled.