a
A DNS host address record. Wikipedia RFC 1035
A5 Used to encrypt GSM cell phone communications.
AAA IOS Configuration
- Router(config)#
username (name>) privilege 15 secret (password) - Router(config)#
aaa new-model - Router(config)#
aaa authentication login { default | (list-name) } local enable - Router(config)#
aaa local authentication attempts max-fail (number-of-unsuccessful-attempts)
- show aaa local user lockout
- clear aaa local user lockout { username (username) | all }
- show aaa user {all | unique id}
- show aaa sessions
- RADIUS
- Router(config)# radius-server host (server IP)
- Router(config)# radius-server key (key)
- TACACS+
- Router(config)#
tacacs-server host (server IP) single-connection - Router(config)#
tacacs-server key (key)
- //example
- Router(config)#
username JR-ADMIN secret Str0ngPa55w0rd - Router(config)#
username ADMIN secret Str0ng5rPa55w0rd - Router(config)#
aaa new-model - Router(config)#
aaa authentication login default local-case enable - Router(config)#
aaa authentication login TELNET-LOGIN local-case - Router(config)#
aaa local authentication attempts max-fail 3 - Router(config)#
line vty 0 4 - Router(config-line)#
login authentication TELNET-LOGIN
AAAA DNS IPv6 host address record. Wikipedia Wikipedia RFC 3596
Aaron Swartz Developer involved with several projects including RSS, Markdown, and Reddit. November 8, 1986 - January 11, 2013. Wikipedia
absolute value |u| = c is equivalent to u = c or u = -c
AC adapter Power adapter that plugs into a standard wall outlet and provides direct current.
AC power plug Standard way of accessing electricity in various parts of a building. Wikipedia
accdb Microsoft Access file. Wikipedia
Accelerated Graphics Port (AGP) Legacy port for graphics cards used before PCI. Wikipedia
Accelerated Processing Unit (APU) Wikipedia
Acceptable Use Policy (AUP) Defines what users may or may not do with regard to the network, website or information system. Wikipedia
access attack An attack that allows unauthorized access to computer resources. Wikipedia
Access Control Entry (ACE) (aka: ACL statement) A single line in a ACL. Can have sequence numbers to identify each entry. Wikipedia
Access Control List (ACL) Set of rules to block or allow packets. ACLs can also be used for specifying internal hosts for NAT and identifying traffic for QoS. Can have one ACL per interface, per direction, per protocol. Two types, standard ACL and extended ACL. IPv4 ACLs can be named or numbered while IPv6 ACLs can only be named. IPv6 ACLs are equivalent to IPv4 extended ACLs. Wikipedia
access control system Verifies a person's identity and that they are an authorized user. Wikipedia
Access Layer Where users connect to or "access" the network. Wikipedia Netacad Netacad Cisco
Access Point (AP) A connection, typically wireless, into a network. Wikipedia
Access Point Name (APN) Wikipedia
Access server Device used for remote entry into a network to configure devices. Wikipedia YouTube
Acer Founded September 1976. Website Wikipedia
Acer Predator 21 X 21' laptop from Acer with two NVIDIA GTX 1080s and a $8,999 price tag. To be released Feburary 2017. Website The Verge
acknowledgment number (ACK) 1-bit flag in a TCP header. Acknowledges a valid field. Wikipedia Wikipedia
ACL Statement (aka: Access Control Entry) A single line in an ACL.
Acronis True Image Website
Action Center (Formerly: Charms bar) Offers quick acces to settings and notifications. First introduced with Windows Phone 8.1. Wikipedia
action query Adds, deletes, or changes data in a table.
Active Directory (AD) Service in Windows Server that allows for easy managment of user accounts and security information. Wikipedia
Active Directory Functional Levels Controls which advanced features are available in the domain or forest. TechNet
Active Directory Lightweight Directory Services (AD LDS) (Previously: Active Directory Application Mode (ADAM)) Light-weight implementation of AD DS. Wikipedia
active hub (deprecated) Type of hub that amplifies and cleans up the signal before broadcasting to all other ports. Deprecated by IEEE 802.3 as of 2011. Wikipedia
Active Server Pages (ASP) Server-side scripting language for dynamic webpages developed by Microsoft. Wikipedia
active state Where the router actively searches for a new path to the destination in an EIGRP route. An EIGRP route would go into the active state if the successor is down or if there was no feasible successor. Wikipedia
Active Threat Level Analysis System (ATLAS) Tool from Arbor Networks used to view network threats. Website
Active Virtual Forwarder (AVF) Each gateway with an assigned virtual MAC address. GLBP group can have up to 4 AVFs. Extra AVFs (more than 4) become SVF. Wikipedia
Active Virtual Gateway (AVG) The first router elected as a gateway in a GLBP group. Highest priority is elected. Assigns a virtual MAC address to each member of the GLBP group. Next highest priority of remaining gateways is elected the SVG. Wikipedia
Active-Matrix Organic Light-Emitting Diode (AMOLED) Type of display that only turns on the necessary pixels to save power and have more accurate color. Wikipedia
active-standby Mode of NIC redundancy that uses only one available NIC at a time.
ActiveX Allows for interactive and multimedia elements to integrate into web pages. Developed by Microsoft. Initially released in 1996. Wikipedia
ad hoc Wireless LAN topology. When two or more devices are directly connected through a wireless network without extra infrastructure. Wikipedia Wikipedia
Adam Osborne Founder of Osborne Computer Corporation (OCC). March 6, 1939 - March 18, 2003. Wikipedia
Adaptive Security Appliance (ASA) Wikipedia
Adaptive Voltage and Frequency Scaling (AVFS)
Add-Computer PowerShell command to add a computer to a domain or workgroup.
PS C:\> Add-Computer -DomainName Domain01 -Restart |
PS C:\> Add-Computer -WorkGroupName WORKGROUP-A |
add-in-board (AIB) Another term for a GPU on a dedicated card that can be added to a computer. Wikipedia
address resolution Used to find the MAC address associated with an IPv6 unicast address. Similar to ARP for IPv4.
Address Resolution Protocol (ARP) Resolves IPv4 address to MAC address. Maintains a mapping table. Wikipedia
adduser Bash command to add a user account. sudo adduser username Linuxers
adjacency database One of the three OSPF databases. Contains the neighbor table. Wikipedia
Administrative Distance (AD) Determines the route to install into the IP routing table. The left side of the brackets represent the AD [1/0]. The trustworthiness of a route source in a routing table. 0 = Connected, 1 = Static, 5 = EIGRP summary, 20 = External BGP (eBGP), 90 = internal EIGRP, 100 = IGRP, 110=OSPF, 115=IS-IS, 120=RIP, 170=External EIGRP, 200=Internal BGP, 255=unknown Wikipedia
Adobe Software company based in San Jose, California. Founded February 28, 1982. Website Wikipedia
Advanced Audio Coding (AAC) Lossy audio compression format. Standardized in April 1997as the successor to MP3 files. Wikipedia
Advanced Data Communication Control Procedures (ADCCP) Layer 2 protocol. Wikipedia
Advanced Encryption Standard (AES) (aka: Rijndael) A type a data encryption. More efficient than DES. Three key lengths; 128, 192, and 256 bits. Can be used by IPsec to encrypt data. Symmetric cryptosystem. First published in 1998. Wikipedia
Advanced Encryption Standard - Cipher Block Chaining (AES-CBC) Used with IPsec Encapsulating Security Payload (ESP). Published September 2003. RFC 3602
Advanced Host Controller Interface (AHCI) Website Wikipedia
Advanced Inspection and Prevention (AIP) Adds IPS capabilities to a Cisco ASA. Netacad
Advanced Inspection and Prevention Security Services Card (AIP-SSC) Netacad
Advanced Inspection and Prevention Security Services Module (AIP-SSM) Netacad
Advanced Micro Devices (AMD) Processor manufacturer. Founded May 1, 1969. Wikipedia
Advanced Research Projects Agency Network (ARPANET) Funded by the U.S. Department of Defense. Helped create the first router. Originated in 1986. Wikipedia
Advanced Technology Attachment (ATA) The predecessor to SATA. Originally developed in 1986 by Wester Digital under the name Integrated Drive Electronics (IDE). Wikipedia TechTerms
Advanced Technology eXtended (ATX) Motherboard standard developed by Intel. Released in 1995. Wikipedia
Advantech A Taiwanese company that manufactures industrial computers. Wikipedia Website
African Network Information Centre (AfriNIC) Website
Ageia Originally developed what would become PhysX. Founded in 2002. Acquired by Nvidia in 2008. Wikipedia
aggregate functions (COUNT, MIN, MAX, and AVG) special functions that perform arithmetic computations over a set of rows. Usually used in conjunction with a GROUP BY clause to group the output of aggregate computations by one or more attribute rows that match a given condition.
Agile software development Set of principles for software development under which requirements and solutions evolve through the collaborative effort of self-organizing cross-functional teams. Wikipedia
Agile Software Development (ASD) Wikipedia
AirPods Wireless headphones made by Apple. Released December 13, 2016. Website Wikipedia
AirPrint Allows Apple devices running macOS or iOS to wirelessly print to a compatible printer or print server. First released November 22, 2010. Wikipedia
Akamai Technologies, Inc. Content Delivery Network (CDN) and cloud services provider headquartered in Cambridge, Massachusetts. Founded in 1998. Website Wikipedia
Alan Cooper The father of Visual Basic. Born June 3, 1952. Wikipedia
Alan Turing June 23, 1912 - June 7, 1954 Wikipedia
Alexander Graham Bell Inventor of the first practical telephone. March 3, 1847 - August 2, 1922. Wikipedia The Guardian
Algorithm Step-by-step procedure for calculations. Wikipedia Khan Academy
alias (AS) Another name assigned to a column name in the output of query in a database. Wikipedia
Alienware Area 51 (2017) Computer from Dell. First OEM to use AMD Threadripper. Announced at E3 2017 June 12, 2017. Available for pre-order June 27, 2017. Website Wikipedia PC World
AllJoyn First released December 21, 2013. Wikipedia
Allo Messaging app from Google powered by machine learning. Announced May 18, 2016. CNET
Alphabet Inc. Parent company of Google. Google was recatagorized under the new company on October 2, 2015 Website Wikipedia
Alps Type of keyboard switch. Wikipedia
alternate ports (backup) Configured in a blocking state to prevent loops. Neither end of the trunk is a root port.
Alternating Current (AC) The flow of current will change direction. Can be transformed to step up or step down the voltage. Favored by Nikola Tesla. Wikipedia
Amazon Echo (2017) Smart speaker from Amazon Announced September 27, 2017. Released October 31, 2017. Website Wikipedia The Verge
Amazon Echo Widely available June 23, 2015. Website Wikipedia
Amazon Echo Plus Smart speaker from Amazon. Announced September 27, 2017. Released October 31, 2017. Website Wikipedia The Verge
Amazon Echo Spot Smart alarm clock from Amazon. Announced September 27, 2017. Released December 19, 2017. Website Wikipedia The Verge
AMD Athlon Family of x86 microprocessors from AMD. First released June 23, 1999. Wikipedia
AMD Athlon 600 First of the CPUs in the family of Athlon microprocessors released from AMD. Released June 23, 1999. Wikipedia
AMD Athlon 650 Microprocessor from AMD. Released August 9, 1999. Wikipedia
AMD Athlon XP 2600+ Microprocessors from AMD. Released August 21, 2002. Wikipedia
AMD EPYC Family of server chips from AMD based on the Zen microarchitecture. Announced May 16, 2017. Released June 20, 2017. Website Wikipedia
AMD FirePro W7170M Released October 2, 2015. Website Wikipedia
AMD FX-9590 (8-Core 4.7 GHz Socket AM3+ 220W) Released July 6, 2013. Wikipedia
AMD Radeon Pro Duo (2016) Professional GPU from AMD. Announced May 14, 2016. Released April 26, 2016. Website Wikipedia (Radeon Pro) Wikipedia (RX 300 series) Press Release
AMD Radeon Pro Duo (2017) Professional GPU from AMD. Announced April 24, 2017. Website Wikipedia Press Release
AMD Radeon Pro WX 7100 Professional GPU from AMD. Released November 2016. Wikipedia
AMD Radeon RX 560 GPU from AMD. Released May 18, 2017. Website OC3D.net
AMD Radeon RX 580 GPU from AMD. Released April 18, 2017 Website Wikipedia
AMD Radeon Vega Frontier Edition First graphics card in the Vega architecture family from AMD. Announced May 16, 2017. Available for pre-order June 27, 2017. Released July 1, 2017. Website Wikipedia Tom's Hardware Newegg
AMD Ryzen 3 1200 Zen architecture CPU from AMD in the Ryzen family. Released July 27, 2017. Website Wikipedia Press Release
AMD Ryzen 3 1300X Zen architecture CPU from AMD in the Ryzen family. Released July 27, 2017. Website Wikipedia Press Release
AMD Ryzen 5 1600X (6 cores, 12 threads, 3.6 GHz, 4.0 GHz boost, 95w TDP, 16 MB L3 cache) CPU from AMD. Released April 11, 2017. Website Wikipedia
AMD Ryzen 7 1700 CPU from AMD. Released March 2, 2017. Website Wikipedia
AMD Ryzen 7 1700x CPU from AMD. Released March 2, 2017. Website Wikipedia
AMD Ryzen 7 1800x CPU from AMD. Released March 2, 2017. Website Wikipedia
AMD Ryzen Threadripper Line of microprocessors in the Ryzen family. To be released summer 2017. Website Wikipedia
AMD Ryzen Threadripper 1900X Zen CPU from AMD. Released August 31, 2017. Website Wikipedia
AMD Ryzen Threadripper 1920X Zen CPU from AMD. 12 core, 24 thread, 3.5GHz base clock, 4.0GHz boost clock, $799 MSRP. Released August 10, 2017. Website Wikipedia Ars Technica
AMD Ryzen Threadripper 1950X Zen CPU from AMD. 16 core, 32 thread, 3.4GHz base clock, 4.0GHz boost clock, $999 MSRP. Released August 10, 2017. Website Wikipedia Ars Technica
AMD64 Wikipedia
American National Standards Institute (ANSI) Private non-profit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States. Wikipedia
American Psychological Association (APA) paper style Wikipedia Microsoft
American Registry for Internet Numbers (ARIN) Founded April 18, 1997. Wikipedia Website
American Standard Code for Information Interchange (ASCII) A fixed-length binary character-encoding scheme. Wikipedia
American Wire Gauge (AWG) Standard for wire sizes Wikipedia
ampere (amp) (A) 1 coulomb per second.
ampersand &
| Decimal | Hexadecimal | Binary |
| 38 | 26 | 00100110 |
Amplitude Modulation (AM) Wikipedia
An incorrect volume label was entered for this drive. Check the current drive letter assignment to the drives and then specify the correct volume label. You can get this information from Disk Administrator. TechNet
Anaconda GUI installer for several Operating Systems including RHEL and Fedora. Wikipedia
analog Wikipedia
analog-to-digital converter (ADC) Wikipedia
André-Marie Ampère The SI unit of current, the ampere, is named after him. Wikipedia
Andrew Grove (Andy Grove) Former CEO of Intel. September 2, 1936 - March 21, 2016 Wikipedia
Android Linux-based operating system designed primarily for touchscreen mobile devices. First released September 23, 2008. Website Wikipedia
Android Nougat (aka: Android N, Android 7.0) Seventh major version of the Android. Released August 22, 2016. Website Wikipedia
Android Oreo (Android O) First preview available March 23, 2017. Officially available in beta May 17, 2017. Name unveiled August 21, 2017. Released August 21, 2017. Website Wikipedia Ars Technica
Android Wear Variation of android for wearable devices. First released March 18, 2014. Wikipedia Website
Android, Inc. Original developer of the Android operating system. Founded in Palo Alto, California October 2003 by Andy Rubin, Rich Miner, Nick Sears, and Chris White. Bought by Google August 17, 2005. Wikipedia Engadget
AngularJS (aka: Angular) Web framework based on JavaScript and maintained by Google. First released October 20, 2010. Wikipedia W3Schools
Anniversary Update (aka: Redstone) Update for Windows 10. Released August 2, 2016. Wikipedia Windows Blogs
Anomaly-based intrusion detection Detects unusual network traffic patterns based upon a baseline of normal network traffic. Wikipedia
ANSI SQL data types Basic types include; NUMBER, NUMERIC, INTEGER, CHAR, VARCHAR, and DATE. Support is different in each RDBMS. Microsoft Access Equivalent ANSI SQL Data Types
answer file Used to automate the installation process. Typically used for operating systems.
Antec Computer case and accessory maker. Founded 1986. Located in Fremont California. Wikipedia
antistatic wrist strap Equalize the electrical charge between a person and the equipment. Wikipedia Netacad
antivirus software (aka: anti-virus software or AV software) Typically host-based. Used to detect and remove viruses from computers. Does not prevent viruses from entering a system or system. Wikipedia Netacad
Antonio Meucci Inventor of the telephone. April 13 1808 - October 18 1889 Wikipedia
anycast (one to-nearest) Wikipedia
AOL Instant Messenger (AIM) Released May 1997. Wikipedia
Apache HTTP server.
| ServerRoot: | |
|---|---|
/usr/local/apache2 | |
/etc/apache2 | Debian |
/etc/httpd | |
"C:/Program Files/Apache Software Foundation/Apache2.2" | Windows |
Apache Lucene Free and open-source information retrieval software library. Written by Doug Cutting in 1999. Website Wikipedia
Apache Subversion (SVN) Software versioning and revision control system distributed as open source under the Apache License. First released October 20, 2000. Website Wikipedia
Apollo 11 Landed on the moon July 20, 1969. Wikipedia
Apollo 8 First manned spacecraft to leave Earth's orbit. Launched December 21, 1968. Wikipedia
Apollo 8 television broadcast Crew of Apollo 8 read the first 10 verses of the Book of Genesis as they orbited the moon on Christmas Eve. Most watched television program of its time. Aired December 24, 1968. Wikipedia PBS
App Velocity Cisco borderless service. Optimizes the user experience of applications. Cisco Cisco
append Adds to the end of a file. Use >> instead of >. Wikipedia
Apple Tech company. Founded by Steve Jobs and Steve Wozniak on April 1, 1976. Wikipedia
Apple DOS OS used on the Apple II. Released in 1978. Wikipedia
Apple Fifth Avenue Apple Store located at 767 Fifth Avenue New York, NY 10153. Opened May 19, 2006. Website Wikipedia Press Release This Day in Tech History
Apple File System (APFS) File system from Apple to replace HFS and HFS+. Quietly announced at WWDC June 13, 2016. Introduced to iOS devices in iOS 10.3 March 27, 2017. Wikipedia
Apple Filing Protocol (AFP) (formerly: AppleTalk Filing Protocol) Proprietary network protocol and part of the Apple File Service (AFS) that offers file services for macOS and the classic Mac OS. One of several file sharing services including SMB, NFS, FTP, and WebDAV. Wikipedia
Apple IBM Motorola (AIM) Alliance between Apple, IBM, and Motorola to create PowerPC. Formed October 2, 1991. Wikipedia
Apple II Released June 10, 1977. Wikipedia
Apple LaserWriter Laser printer with built-in PostScript interpreter from Apple Computer, Inc. One of the first laser printers available to the mass market. Released March 1, 1985. Discontinued February 1, 1988. Wikipedia
Apple Lisa Released January 19, 1983. Wikipedia
Apple Lossless Audio Codec (ALAC) (aka: Apple Lossless) Lossless audio format developed by Apple. First released April 28, 2004. Wikipedia
Apple Mail Wikipedia
Apple Park (aka: Apple Campus 2, Apple Spaceship Campus) Opening to employees in April 2017. Wikipedia Apple Press Release
Apple Services System Status Website
Apple Special Event "Let's meet at our place." First event to be held at the Steve Jobs Theater in the Apple Park Campus. September 12, 2017. Wikipedia
Apple Special Event "Gather round" September 12, 2018. Wikipedia
Apple Special Event "It's show time." Held at the Steve Jobs Theater in the Apple Park campus March 25, 2019. Wikipedia
Apple Watch (aka: Apple Watch Series 0) Smartwatch made by Apple. Website Wikipedia
Apple Watch Nike + Model of the Series 2 Apple Watch. Released October 28, 2016. Website Wikipedia
Apple Watch Series 1 Smartwatch made by Apple. Website Wikipedia
Apple Watch Series 2 Smartwatch from Apple. Announced September 7, 2016. Released September 16, 2016. Website Wikipedia Press Release
Apple/UNIX (A/UX) Wikipedia
AppleTalk Proprietary suite of networking protocols developed by Apple for their Macintosh computers. Wikipedia
Application Software designed to help the user perform specific tasks. Wikipedia
Application Centric Infrastructure (ACI)
application firewall Filters Layers 3,4,5, and 7. Mostly done with software.
Application Layer (OSI Layer 7) Abstraction layer in the internet protocol suite (TCP/IP) and the OSI model. Allows access to network services such as file transfer, electronic mail, and database access. Wikipedia
Application Layer Services Programs that interface with the network and prepare the data for transfer. Wikipedia
Application Log Event log in Windows that contains information about the software running on the system. Three levels of security are: Information, Warning, and Error.
Application Programming Interface (API) Lets programs talk to eachother. Wikipedia PC Mag
Application System/400 (AS/400) Introduced June 21, 1988. Wikipedia
Application-Specific Integrated Circuits (ASIC) Often used in multilayer switches. With the right software, can forward packets without the CPU. Wikipedia
apropos Linux utility used to search for other utilities.
Arch Linux A Linux distribution. First released March 11, 2002. Wikipedia
Area The area of a plane figure is the amount of surface inside the figure.
| A = l × w |
AREA Named section of permanent storage space that is reserved to store the database. Used in DB2.
Area 0 Main area for an OSPF network Also called the backbone. All areas must be connected to area 0.
Area Border Router (ABR) Has interfaces attached to multiple OSPF areas. Advertises networks learned from the type 1 LSAs to other areas as type 3 LSAs. Wikipedia
argument Type of token that a command that a command acts on.
Arithmetic Logic Unit (ALU) Part of a CPU that performs logic and arithmetic. Wikipedia
ARM Type of preprocessor that is commonly used in mobile devices. Wikipedia
arp -a DOS command used to list current ARP cache.
arp -d DOS command used to refresh the ARP cache.
ARP cache Collection of ARP entries, which map IP addresses to MAC addresses. Created when a hostname is resolved to an IP address and then an IP address is resolved to a MAC address. Either static or dynamic, but mostly dynamic. Wikipedia Petri
ARP poisoning Introducing false entries into a host’s APR cache. Allows an attacker to hide behind a fake IP address. Wikipedia
array (data structure) A list. Collection a values and variables Wikipedia TechNet (PowerShell - Accessing Values in an Array)
array_rand PHP function that randomly picks from an array. PHP Manual W3Schools
Arthur Scherbius Inventor of the Enigma machine. October 30, 1878 - May 13, 1929. Wikipedia
Artificial intelligence (AI) Machines that operate with human-like intelligence. Wikipedia
Ashes of the Singularity Real-time strategy game. Released March 31, 2016. Website Wikipedia Steam
Ashes of the Singularity: Escalation Expansion to the original game; Ashes of the Singularity. Released November 10, 2016. Merged into the base game February 16, 2017. Website Wikipedia Steam
Asia Pacific Network Information Centre (APNIC) Wikipedia Website
ASLEAP Exploit to Lightweight Extensible Authentication Protocol (LEAP). Released by Joshua Wright in early 2004. Wikipedia
aspect ratio Wikipedia Wikipedia
Aspect-Oriented Programming (AOP) Wikipedia
Assembly A low-level programming language. Wikipedia
assoc Command that displays or modifies file extension associations. Wikipedia Microsoft Support
associative array (assoc) Data type. Wikipedia
assumption Cell reference in an Excel formula.
asterisk * A route in a routing table that is a candidate for a default route. Wikipedia
ASUS Computer hardware manufacturer. Website Wikipedia
ASUS PRIME B350-PLUS (AM4 AMD B350 SATA 6Gb/s USB 3.1 USB 3.0 HDMI ATX) Motherboard form ASUS. Released March 7, 2017. Newegg
ASUS Prime X370-Pro (AM4 AMD X370 SATA 6Gb/s USB 3.1 USB 3.0 HDMI ATX) Motherboard from ASUS. Released March 7, 2017. Newegg
ASUS ROG Crosshair VI Hero (AM4 AMD X370 SATA 6Gb/s USB 3.1 USB 3.0 ATX) Motherboard from ASUS. Released March 9, 2017. Newegg
ASUS XG-U2008 Unmanaged network switch from ASUS. Features two 10GBASE-T ports and eight 100/1000 Mbps Ethernet ports. Website
ASUS Zenbook UX21E Twelve-inch ultrabook from ASUS. First released October 12, 2011. Website Wikipedia
ASUS ZenBook UX303UB Laptop from ASUS. Website Support Wikipedia
ASUS Zenbook UX31E Thirteen-inch ultrabook from ASUS. First released October 12, 2011. Website Wikipedia
asymmetric cryptography (aka: public-key cryptography) Cryptographic system uses two separate keys; public and private. Public keys only encrypt and private keys only decrypt. Handles authentication and encryption. Mostly used for transmitting session keys. Typically slower than symmetric algorithms. 512-4096 bits. (RSA, ElGamal, elliptic curves, and DH) Wikipedia
Asymmetric Digital Subscriber Line (ADSL) Faster download speed than upload speed. Wikipedia
Asynchronous Not requiring a clock rate. Wikipedia
Asynchronous Balanced Mode (ABM) Wikipedia
Asynchronous DRAM (ADRAM) (legacy) First type of DRAM in use. Originated in the 1960s and in commonly in use until about 1997. Replaced by SDRAM. Wikipedia
Asynchronous JavaScript and XML (AJAX) Wikipedia W3Schools
Asynchronous Transfer Mode (ATM) A packet-switched WAN. Works on public and private networks. Small cells of fixed length are good for voice and video traffic because it maintains good signal. Wikipedia
at Command that schedules other commands and programs to run on a computer. Wikipedia Wikipedia
AT system connector Original power connector for early AT PC motherboards. Wikipedia
AT&T Telecommunications company. Wikipedia
AT&T Outage Information Website
Atanasoff-Berry computer (ABC) First automatic electronic digital computer. Designed 1937 to solve systems of linear equations. Wikipedia
Atari Founded by Nolan Bushnell and Ted Dabney June 27, 1972. Wikipedia
ATI Radeon HD 3870 Released November 9, 2007. Wikipedia
ATM cells Always have a fixed length of 53 bytes. (5 byte header, 48 byte payload.) Wikipedia
Atom Text editor for OS X, Linux and Windows developed by GitHub. Wikipedia Website
attachment File sent in an email. Gmail allows attachments up to 25MB in size. Gmail Support
Attachment Unit Interface (AUI) Physical and logical interface defined in the original IEEE 802.3 standard for 10BASE5 Ethernet. Phased out in the early 1990s in favor of 10BASE-T. Wikipedia
attack Attack = Motive (Goal) + Method + Vulnerability.
ATTRIB DOS command that displays or changes file attributes. Wikipedia
attributes Data that describes an object. Wikipedia
au (.au) Top level domain for Australia.
AuditPol.exe Website Wikipedia
authentication Confirms the truth of an identification through credential validation. Passwords and PINs are simple forms of authentication. Ensures message is form who it claims to be from and that it was not forged. Wikipedia
Authentication Header (AH) (IP protocol 51) Member of the IPsec protocol suite. Provides connectionless data integrity, data authentication, and anti-Replay detection, but not data encryption. Supports HMAC-MD5 and HMAC-SHA-1. Can have problems with NAT. Wikipedia
Authentication Mechanism Assurance (AMA) Controls access to network resources based on the type of certificate used during logon. Introduced in Windows Server 2008 R2. TechNet
Authentication Server (AS) (TACACS+ or RADIUS) Wikipedia
Authentication Service (AS) Part of Kerberos that provides the Ticket Granting Ticket (TGT).
Authentication, Authorization and Accounting (AAA) Family of protocols which mediate network access. Two AAA protocols include RADIUS and TACACS+. Both RADIUS and TACACS+ provide auditing of log files. Wikipedia
Authentication, Authorization, and Accounting with Secure Transport (AAAA) Wikipedia
Authorization Specifies access rights. Elements include separation of duties, rights, permissions and privileges, and the principle of least privilege. Wikipedia
Automatic Certificate Management Environment (ACME) Protocol for automating interactions between certificate authorities and their users' web servers, allowing the automated deployment of public key infrastructure at very low cost. Wikipedia
Automatic Data Processing (ADP) Website
Automatic Private IP Addressing (APIPA) (aka: auto-IP) Microsoft's name for an IPv4 link-local address. Addresses are assigned in the class B 169.254.0.0 to 169.254.255.255 range. Typically the result of a DHCP error. TechNet Wikipedia
automatic summarization Converts addresses into classful. Wikipedia
Autonomous System (AS) Collection of routers under a common administration such as a company or organization. Wikipedia
Autonomous System Boundary Router (ASBR) A router located between an OSPF routing domain and a non-OSPF network. Wikipedia
AutoNumber Wikipedia
Autotransformer Have only one winding used as both the primary and secondary. At a disadvantage by not having line isolation between the windings.
AUX port Similar to a console port but configuration occurs through a dial-up connection. Wikipedia