NETWORK+ Terms T's Flashcards
T1 lines are a form of TCarrier lines that offer transmission speeds of 1.544Mbps. E1 refers to the European equivalent of T1. See also T-carrier.
T1/E1
T3 carrier lines offer transmission
speeds of up to
44.736Mbps, using 672 64Kbps B
channels. See also T-carrier
T3/E3
A security protocol designed to provide centralized validation of users who are attempting to gain access to a router or Network Access Server (NAS). TACACS+ is a set of security protocols designed to provide authentication, authorization, and accounting (AAA) of remote users. TACACS uses TCP port 49 by default.
TACACS+ (Terminal Access
Controller Access Control System
Plus)
T-carrier lines are highspeed dedicated digital lines that can be leased from telephone companies. T-carrier lines can support both voice and data transmissions and are often used to create pointto- point private networks.
T-carrier
A connection-oriented, reliable data transmission communication service that operates at the transport layer of the OSI model. TCP is part of the TCP/IP suite.
TCP (Transmission Control
Protocol)
A suite of protocols that includes TCP and IP. TCP/IP was originally designed for use on large internetworks but has now become the de facto protocol for networks of all sizes.
TCP/IP (Transmission Control
Protocol/Internet Protocol)
A socket, or connection
to an endpoint, used in
TCP/IP communication transmissions.
TCP/IP socket
Divides a single communication channel into multiple channels, enabling data signals to be transferred simultaneously as subchannels in one communication channel. Despite being only a single channel, data signals take turns sending data.
TDM (Time-Division Multiplexing)
A device used to test copper cables
to determine whether and where a
break is on the cable. For optical
cables, an optical TDR is used.
TDR (time-domain reflectometer)
A standard terminal emulation protocol in the TCP/IP stack. Telnet is used to perform terminal emulation over TCP/IP via remote terminal connections, enabling users to log in to remote systems and use resources as if they were connected to a local system.
Telnet
A device
used to monitor temperature typically
in a server room or wiring
closet.
temperature monitor
A service on Windows Server platforms that enables clients to connect to the server as if it were a multiuser operating system. All the processing for the client session is performed on the server. Only screen updates and user input are transmitted across the network connection.
Terminal Services
A simplified version of FTP that enables file transfers but does not offer any security or file management capabilities. TFTP uses TCP/IP port 69.
TFTP (Trivial File Transfer Protocol)
The thick cable most
commonly used as the backbone of a
coaxial network. It is approximately
.375 inches in diameter.
thick coaxial
The IEEE 802.3 standard 10Base5, which describes Ethernet networking using thick coaxial cabling. Also called ThickNet.
thick Ethernet
An application run from a back-end server system such as Microsoft Terminal Services. The processing tasks are all performed at the terminal server rather than on the client. In basic usage, only screen updates are sent from the terminal server, and only keyboard and mouse data is sent to the terminal server.
thin client
Cable that is thinner
than thick coaxial cable but still
about .25 inches in diameter. It is
commonly used in older bus topologies.
thin coaxial
The 802.3a standard
10Base2, which describes Ethernet
networking using thin coaxial
cabling. Also called ThinNet
thin Ethernet
A device used to
test the actual data throughput of a
network cable.
throughput tester
An organization that,
along with the Electronic Industries
Association (EIA), develops standards
for telecommunications technologies.
TIA (Telecommunications Industry
Association)
Designed to address the
shortcomings of the WEP security
protocol. TKIP is an encryption
protocol defined in IEEE 802.11i.
TKIP (Temporal Key Integrity
Protocol)
A digital communication line used in WANs. Commonly used T designations are T1 (Trunk Level 1) and T3 (Trunk Level 3). It is also possible to use only part of a T1 line, which is known as fractional T1. T1 lines support a data transmission rate of up to 1.544 Mbps.
T-line
A security protocol designed to ensure privacy between communicating client/server applications. When a server and client communicate, TLS ensures that no one can eavesdrop and intercept or otherwise tamper with the data message. TLS is the successor to SSL.
TLS (Transport Layer Security)
A frame that provides controlling information. In a token ring network, the node that possesses the token is the one that is allowed to transmit next.
token
An IBM-proprietary token-passing LAN topology defined by IEEE standard 802.5. It operates at either 4Mbps or 16Mbps in a star topology.
token ring
Traditionally an ISA or Microchannel device with 4Mbps or 16Mbps transfer capability used to connect nodes to a token ring network
token ring adapter
A device used with a tone locator to locate and diagnose problems with twisted-pair cabling. Commonly referred to as fox and hound.
tone generator
A network tool used
to locate the ends of a run of network
cable.
toner probe
The shape or layout of a
physical network and the flow of data
through the network. See also logical
topology and physical topology.
topology
A function of the TCP/IP suite, implemented in utilities such as traceroute and tracert, which enables the entire path of a packet to be tracked between source and destination hosts. It is used as a troubleshooting tool.
trace route
A Windows command-line
utility used to track the route a data
packet takes to get to its destination.
tracert
To send data using light, electronic, or electric signals. In networking, this is usually done in the form of digital signals composed of bits.
transmit
A situation in which the bridges on a network tell each other which ports on the bridge should be opened and closed, which ports should be forwarding packets, and which ports should be blocking packets—all without the assistance of any other device.
transparent bridging
Layer 4 of the OSI model. Protocols at this layer perform functions such as segmenting data so that it can be sent over the network and then reassembling the segmented data on the receiving end. The transport layer also deals with some of the errors that can occur in a stream of data, such as dropped and duplicated packets.
transport layer
A communications protocol responsible for establishing a connection and ensuring that all data has arrived safely. It is defined in Layer 4 of the OSI model.
transport protocol
A type of program that
appears legitimate but performs
some illicit activity when it is run.
Trojan
A value assigned to a packet of data to prevent it from moving around the network indefinitely. The TTL value is decremented each time the packet crosses a router, until it reaches 0, at which point it is removed from the network.
TTL (Time To Live)
A type of cable that
uses multiple twisted pairs of copper
wire.
twisted pair
