t
T1 (aka: T1 Line) Type of dedicated leased line. Composed of 24 64Kbps DS0 channels for a total bandwidth of 1.544Mbps. Originally used for telephony networks to carry one conversation in a single channel. Wikipedia
T3 Line Wikipedia
T568A g.G.o.B.b.O.br.BR Wikipedia Wikipedia
T568B o.O.g.B.b.G.br.BR Wikipedia Wikipedia
table (aka: relation) Collection of related data held in columns and rows within a database. Persistent representation of a logical relation in a database. Table and relation are used interchangeably because the relational model's creator, E. F. Codd, used the two terms as synonyms. Wikipedia
tag Helps with the frame election process.
tail Command that displays the end of a file. (head shows the beginning.) For example tail -f /var/log/messages can be used with the -follow switch to see syslog messages and print new data as the file grows. Wikipedia YouTube Linux 101 Hacks
tailored web design (aka: Responsive Web Design (RWD)) Wikipedia
tar (tape archive) Both a file format and a program. Example:
tar -zxvf |
Taylor Otwell Developer of Laraval.
TC Shell (tcsh) Default shell in FreeBSD. Previosly used as the default shell before Mac OS X 10.3. Website Wikipedia
TCP ACK scan -sA Nmap scan option that typically used to get past a firewall. Nmap
TCP Flag SYN, ACK, FIN, SYN/ACK
TCP Segment Source Port, Destination Port, Sequence Number, Acknowledgement Number, Header length, Reserved, Control bits, Window, Checksum. Urgent, Options, Application Layer Data. Wikipedia
TCP SYN scan -sS Default and most popular Nmap scan option. Used to perform a TCP SYN stealth port scan. Nmap
tebibyte (TiB) (1024 gibibytes = 1,099,511,627,776 bytes) Defined by the International Electrotechnical Commission (IEC) Wikipedia
technical controls e.g. user authentication (login) and logical access controls, antivirus software, firewalls. Wikipedia
tee Outputs to a file and writes to standard output. Wikipedia
Telecommunications Industry Association (TIA) Wikipedia
Telelocator Alphanumeric Protocol (TAP) Wikipedia
Telenet Commercial packet switched network. Went into service in 1974. Wikipedia
Telnet Protocol used to provide remote CLI access devices such as servers and networking equipment. Does not encrypt transmission. Wikipedia
Temporal Key Integrity Protocol (TKIP) Security protocol used in IEEE 802.11 as a temporary solution to WEP. Published October 31, 2002. Deprecated in 2012. Wikipedia
temporary files usually located in the following folders: C:\Windows\Temp C:\Users\User_Name\AppData\Local\Temp %USERPROFILE%\AppData\Local\Temp
terabyte (TB) 1 trillion bytes. Wikipedia
Terminal Access Controller Access-Control System (TACACS (TCP or UDP port 49) Family of related protocols handling remote authentication and related services for networked access control through a centralized server. Originally developed by BBN Technologies for administering MILNET in 1984. Wikipedia
Terminal Access Controller Access-Control System Plus (TACACS+) Protocol developed by Cisco. Although derived from TACACS, TACACS+ is a separate protocol that handles authentication, authorization, and accounting (AAA) services. Encrypts an entire authentication packet, rather than just the password. Released as an open standard beginning in 1993. Wikipedia
terminal length Used in conjunction with another command to specify number of lines displayed in terminal.
Tesla Motors American automotive and energy company. Founded July, 2003. Wikipedia
test Builtin utility for Bash. Brackets [ ] can be put around what is being tested instead.
Test Anything Protocol (TAP) Wikipedia
TEST-NET Addresses Reserved for teaching and learning purposes Wikipedia
tethering Using a smartphone or tablet as a personal hotspot.
Text Reckoning And Compiling (TRAC) Programming language. Developed in the early 1960s by Calvin Mooers. Wikipedia
TFTP server Stores information that can be retrieved easily. Often used for device recovery.
The Dark Knight Second film in the Christopher Nolan's The Dark Knight Trilogy. Released July 18, 2008. IMDB Wikipedia
The Jazz Singer first feature-length motion picture with synchronized sound October 6, 1927. Wikipedia
The Matrix Released March 31, 1999. IMDB Wikipedia
The Vintage Computer Festival (VCF) Founded by Sellam Ismail in 1997. Wikipedia
This isn't Pico (TIP) Original name for the text editor nano. Wikipedia
Thomas Jefferson Invented an encryption system believed to have been used between 1790-1793.
thread Smallest sequence of programmed instructions that can be managed independently by a scheduler. Wikipedia
threat Event that exploits a vulnerability’s potential to do harm to an asset. Can be adversarial (i.e. hacking; individual cracker or a criminal organization), accidental (i.e. misconfiguration), structural (i.e. a computer malfunctioning), or environmental (i.e. natural disaster such as an earthquake, a fire, or a tornado). Wikipedia
threat agent (aka: threat actor) Person or entity that initiates a threat. Wikipedia
threat assessment Often done alongside a risk assessment.
| adversarial |
| accidental |
| structural |
| environmental |
three-tier hierarchical design Handles resources efficiently and scales easily.
three-way handshake used by TCP Wikipedia
Threefish Symmetric-key tweakable block cipher. Wikipedia
Threshold Codename for Windows 10. Wikipedia
Threshold 2 (TH2) (aka: Cumulative Update for Windows 10 Version 1511 for x64-based Systems, November Update, (KB3118754), or Build version 10.0.10586.) First major update to Windows 10. Released November 12, 2015 Wikipedia
through-hole Leads are inserted into holes in the PCB. Wikipedia
throughput The maximum amount of data that can be downloaded or uploaded at a time. Wikipedia
Thunderbolt Developed by Intel and used mainly by Apple. Allows for seed up to 10x faster than USB 3.0 Wikipedia
Ticket Granting Service (TGS) Part of Kerberos that generates a session key.
Ticket Granting Ticket (TGT) (aka: Security Identifier (SID)) Part of Kerberos that is provided by the Authentication Service.
Tier 1 ISP Directly connected to the internet backbone. Primarily serves very large companies and Tier 2 ISPs
Tier 2 ISP Primarily serves large companies and Tier 3 ISPs.
Tier 3 ISP Primarily serves small/medium sized companies and homes.
Tiger (Mac OS X 10.4) Wikipedia
tilde ~ HOME directory in Bash.
Tim Berners-Lee Inventor of the World Wide Web. Born June 8, 1955. Wikipedia
time Used to determine the duration of execution for a particular command. Wikipedia
time Command that displays or sets the system time. Use date for UNIX-based systems or clock set/show clock for IOS. Wikipedia
Time Division Multiple Access (TDMA) Wikipedia
Time Division Multiplexing (TDM) Splits the bandwidth of a single link into multiple time slots with a MUX. Wikipedia
Time Warner Cable (TWC) Second largest cable company next to Comcast. Wikipedia
Time-to-Live (TTL) 8-bit binary value used to limit the lifetime of a packet. Wikipedia
times & times; HTML symbol for the multiplication sign.
tip and ring Red and green wires found in an RJ-11 wall jack, which carry voice, ringing voltage, and signaling information between an analog device (for example, a phone or a modem) and a telephone's wall jack.
title Command that sets the window title for a CMD.EXE session.
token Sequence of nonblank characters on the command line. Basicaly a word.
toll network Equipment inside the WAN provider network. (Long-haul, all-digital, fiber, switches, routers,...)
toner probe Used to trace the location of a cable. Can find a cable when a tone generator is atached to one end. Wikipedia Netacad
Top Level Domain (TLD) (.com .org .au .co .jp...) Wikipedia
tracing Logging information about a program to later be used for debugging. Wikipedia
TCP connect scan -sU Nmap scanning mothod. Similar to the TCP SYN scan, except that it does complete the three-way handshake. Nmap
The Internet Health Report Open source documnet from Mozilla explaining the health of the internet with data from multiple sources. Announced January 19, 2017. Website Mizilla Blog
This Day in Tech History The history of technoligy in a daily blog. Website
Titan Supercomputer from Cray. Operational October 29, 2012. Wikipedia
Titanfall Released March 11, 2014. Wikipedia
Titanfall 2 Released October 28, 2016. Wikipedia
tone generator Sends a tone through the length of a cable. Wikipedia Netacad
topology Layout of a network that describes where devices will go and how they will be connected. There are two kinds of topologies, logical and physical. Wikipedia
Total Cost of Ownership (TCO) Wikipedia
TouchWiz Developed by Samsung. Wikipedia
TO_NUMBER Oracle function used to convert a character string into a number. Digits are represented by “9”.
traceroute Network Command-line utility that displays the path (route) and measures the delay of packets. Traces packets to a destination address for troubleshoot issues. UNIX-like systems use traceroute, while Windows-based systems use the shorter tracert. Wikipedia
tracert Windows version of the traceroute command. Use traceroute for UNIX based systems. Wikipedia
track One complete circle on one side of a hard drive's platter where data is written and read. A track is broken into multiple sectors. Netacad
traffic classification Categorizes packets automatically based on parameters such as port or protocol. Wikipedia
transceiver Both a transmitter and a receiver. Similar to a repeater. Wikipedia
transformer YouTube (Make:)
transformer Among the most common electrical devices. Can change the values of voltage, current and impedance but cannot change the frequency.
- primary winding - connected to the powerline
- secondary winding - connected to the load
transistor Wikipedia YouTube (Make:)
translate (tr) Replace or remove specific characters in its input data set. Man Page Wikipedia
translation NAT64 allows IPv6 to communicate with IPv4
Transport Control Protocol (TCP) (Layer 4 protocol.) Breaks data into segments for IP before they are sent. Full-duplex. Connection oriented. Has flow-control for each byte stream. TCP segments are marked with flags. Robert Kahn and Vitron Cerf began work on TCP in 1973. Wikipedia Wikipedia (List of Ports)
Transport Control Protocol/Internet Protocol (TCP/IP) (aka: TCP/IP model, Department of Defense (DoD) model) Protocol suite. The IP suite is commonly known as TCP/IP because the foundational protocols in the suite are the Transmission Control Protocol (TCP) and the Internet Protocol (IP).
| 1 | network interface |
| 2 | internet |
| 3 | transport |
| 4 | application |
Predates the OSI model, a more comprehensive reference framework for general networking systems. Replaced proprietary protocol suits such as AppleTalk and Novell's Internetwork Packet Exchange/Sequenced Packet Exchange (IPX/SPX). Wikipedia
Transport Layer (OSI Layer 4) Provides transport transfer of data between hosts. Responsible for services such as connection-oriented communication, reliability, flow control, and multiplexing. Layer 4 destination port is used to identify the upper layer protocol. Wikipedia
Transport Layer (OSI Layer 4) Conceptual layer in the internet protocol suite (TCP/IP) and the OSI model. Divides long communications into smaller data packages and handles error recognition and correction. Wikipedia
Transport Layer Security (TLS) Successor to SSL. TLS 1.0 first defined in RFC 2246 January 1999. Wikipedia RFC 2246
Transport Layer Security 1.1 (TLS 1.1) Defined in RFC 4346 April 2006. Website Wikipedia
Transport Layer Security 1.2 (TLS 1.2) Defined in RFC 5246 August 2008. Website Wikipedia
Transport Layer Security 1.3 (TLS 1.3) Working draft as of July 2016. Wikipedia
Transport Mode Firewall mode on the Cisco ASA. Functions as a Layer 2 device. Protects only the packets payload. Works well with GRE. Netacad
transposition Characters are rearranged. Used in part by DES and 3DES.
trap messages Solution to the main disadvantage of SNMP polling. Generated by SNMP agents and sent to the NMS to inform it of events without waiting for it to be polled. Wikipedia
tree Command to graphically display the directory structure of a drive or path. Wikipedia
TrendMicro Security software company based in Tokyo, Japan. Founded in 1988. Wikipedia Website
Triple Data Encryption Standard (3DES) (Legacy) Applying DES three times in a row to a plaintext block. Can be used by IPsec to encrypt data. Three 56-bit encryption keys per 64-bit block. Symmetric. Wikipedia
Trivial File Transfer Protocol (TFTP) Used for connectionless active file transfer. Uses port 69. Wikipedia
Trojan horse Software that appears to be useful but is actually malicious.
| Classifications: |
|---|
| remote access |
| data sending |
| destructive |
| proxy |
| FTP |
| security software disabler |
| DoS |
trunk Single connection between two points such as a switch or branch office. Wikipedia
Trusted Execution Environment (TEE) Isolated environment running alongside a mobile OS. Wikipedia
Trusted Platform Module (TPM) (aka: ISO/IEC 11889) Dedicated microcontroller that performs cryptographic functions, such as encrypting an entire hard drive. Wikipedia
TrustSec Cisco borderless service. Secures the network based on polices in addition IP/MAC addresses. Different departments can determine who gets access to what while all being spelled out in plain English. YouTube (Cisco - Fundamentals of TrustSec) Cisco YouTube (Cisco - TrustSec Takes the Complexity Out of Network Security)
TUN/TAP Virtual network kernel devices. Wikipedia
Tunnel Mode (aka: IP-in-IP encryption) Secures the entire IP packet. Netacad
Tunneled Direct Link Setup (TDLS) Enables devices to directly connect to each other when connected to the same Wi-Fi network. Wi-Fi Alliance Wikipedia
tunneling Transporting an IPv6 packet over an IPv4 network. IPv6 packet is encapsulated inside an IPv4 packet. (for networks that don't support dual stack) Wikipedia
Turing test A test of a machine's ability to exhibit intelligent behavior equivalent to, or indistinguishable from, that of a human.
Twentieth Anniversary Macintosh Released March 20, 1997. Wikipedia
Twitter Founded March 21, 2006. Wikipedia
Two-Factor Authentication (2FA) (aka: two-step verification) Wikipedia
two-tier hierarchical design Core and distribution layers implemented into a single layer.
Twofish Symmetric key block cipher. One of the five finalists of the AES contest, but was not standardized Wikipedia
Twttr Group SMS social network launched by Odeo. Released July 15, 2006. TechCrunch
type Shell builtin. Command that describes how its arguments would be interpreted if used as command names. Added to the Bourne Shell in 1984. Wikipedia (UNIX)
TYPE Command that displays the contents of a text file. Wikipedia (DOS)
Type Length Value (TLV) The data portion of an EIGRP message that is encapsulated in a packet. Wikipedia
Type of Service (ToS) Part of an IPv4 packet header now represented by Differentiated Services Code Point (DSCP). Wikipedia (ToS) Wikipedia (IPv4 Header)
type system Wikipedia