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A T1 line consists of 24 voice channels packed into a 193 bit frame and transmitted at 1.544 Mbps.

The unframed version, or payload, is 192 bits at a rate of 1.536 Mbps.

802.1Q is an IEEE standard for tagged VLANs (Virtual LANs) in which a VLAN ID is inserted into

the layer-2 frame header to allow the creation of dynamic VLANs across switches. Tagged VLANs

are not confined to the switch on which they were created as are port-based VLANs.

TCP is a connection-oriented transport service that ensures the reliability of message delivery.

It verifies that messages and data were received.

TCP/IP filter rules allow you to base the rule on the fields in the IP and the upper layer protocol,

for example, UDP and TCP headers.

The generic name for telephone companies throughout the world.

Telnet is the login and terminal emulation protocol common on the Internet and in UNIX environments.

It operates over TCP/IP networks. Its primary function is to allow users to log into remote host systems.

Electromagnetic signals radiate from electronic equipment and cables. Extra shielding is used on cables

and equipment to meet TEMPEST requirements, in order to stop these signals from going out to unauthorized listeners.

A device that allows you to send commands to a computer somewhere else. At a minimum, this usually

means a keyboard, display screen and some simple circuitry.

Software that pretends to be (emulates) a physical terminal and allows you to type commands to a

computer somewhere else.

TFTP is an Internet file transfer protocol similar to FTP (File Transfer Protocol), but it is scaled

back in functionality so that it requires fewer resources to run. TFTP uses the UDP (User Datagram Protocol)

rather than TCP(Transmission Control Protocol).

Three way calling allows you to add a third party to an existing call. You must subscribe to your

telephone company for this service.

A twisted pair telephone wire consists of one tip wire and one ring wire. The polarity on the tip and ring

wires gets reversed according to the requirements of a country's telephone system.

Temporal Key Integrity Protocol (TKIP) is an encryption protocol that uses 128-bit keys that

are dynamically generated and distributed by the authentication server. TKIP regularly changes

and rotates the encryption keys so that the same encryption key is never used twice.

Traffic Redirect forwards WAN traffic to a backup gateway on the LAN when the router cannot

connect to the Internet, thus acting as an auxiliary backup.

IPSec uses transport mode to protect upper layer protocols and affects only the data in the IP packet.

The IP packet contains the security protocol (AH or ESP) located after the original IP header and options,

but before any upper layer protocols contained in the packet (such as TCP and UDP).

A trap is a report sent to an SNMP manager when an event occurs.

Trigger Port Forwarding allows computers on your LAN to dynamically take turns communicating

with servers on the WAN that do not accept NAT port translation.

This is a stronger variant of DES (Data Encryption Standard). Triple DES is a widely-used method

of data encryption that applies three separate private (secret) 56-bit keys to each 64-bit block of data.

Like the fabled gift to the residents of Troy, a Trojan Horse is an application designed to look harmless.

Yet, when you run the program it installs a virus or memory resident application that can steal passwords,

corrupt data or provide hackers a back door into your computer. Trojan applications are particularly

dangerous since they can often run exactly as expected without showing any visible signs of intrusion.

Trunking (link aggregation) is the grouping of physical ports into one logical higher-capacity link.

You may want to trunk ports of for example, if it is cheaper to use multiple lower-speed links than to

under-utilize a higher-speed, but more costly, port link. However, the more ports you aggregate to

get higher bandwidth then the fewer available ports you have.

IPSec uses tunnel mode to encapsulate the entire IP packet and transmit it securely. Tunnel mode is

fundamentally an IP tunnel with authentication and encryption and is required for gateway services to

provide access to internal systems.

Two insulated wires, usually copper, twisted together and often bound into a common sheath to

form multi-pair cables. In ISDN, the cables are the basic path between a subscriber's terminal or telephone

and the PBX or the central office.

This is the number of kilobytes per-second transmitted on an interface.