c
C Indicates a directly connected network in a routing table. Wikipedia
C Programming language developed by modifying the B language. Machine-independent "portable assembler". Wikipedia
C# Object oriented programming language. Released July 2000 Wikipedia
C++ Object-oriented programming language. Introduced in 1983. Website Wikipedia
cable Made up of two or more wires. Wikipedia
Cable Modem Termination System (CMTS)
cable television (CATV) (originally stood for: Community Access Television, Community Antenna Television) System of delivering television programming to paying subscribers via radio frequency (RF) signals transmitted through coaxial cables, or in more recent systems, light pulses through fiber-optic cables. Wikipedia
cache Reduces the main memory access time. Wikipedia
cacls Windows command that displays or modifies ACLs of files. Wikipedia
Caesar cipher Simple substitution cipher. Wikipedia
call Command that calls one batch program from another. Microsoft
Call Expressions Evaluate then apply the operator to the operand.
operator(operand, operand)
candidate key Minimal superkey. Key that does not contain a subset of attributes that is itself a superkey.
Canonical Name (CNAME) Sometimes referred to as an alias.
capacitance Generally rated in farads (F), microfarads (μF), nanofarads (nF) or picofarads (pF). To find the total:
| connected in parallel | values add |
| connected in series | reciprocal method |
capacitor Oppose a change of voltage. Capacitance determined by:
- surface area of the palates
- distance between the plates
- type of dielectric used
CareKit Open-source framework from Apple. Released March 21, 2016. Website Wikipedia
caret ^ Regular expression that matches the beginning of a line. Example: ^foobar will find any line beginning with foobar. Begins an anchor regular expression. '^*$' Can be used to negate characters with brackets. [^] Wikipedia
Carol Shaw Wikipedia
Carriage Return and Line Feed (CRLF) newline
Carrier Sense Multiple Access (CSMA) Protocols based on CSMA are non-deterministic. (Media independent.)
Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Wikipedia
Carrier-Sense Multiple Access with Collision Avoidance (CSMA/CA) Can increase latency in a WLAN. Adds a random delay before transmitting data in an attempt to avoid collisions. Sends a message across the media before it sends a frame. Wikipedia
carving Process of data recovery where residual info does not exist for restoration. Wikipedia
Cascading Style Sheet (CSS) Web design language used for styling a web page. Wikipedia Khan Academy
Catalyst Brand of network switch from Cisco. Website Wikipedia
Category X cable (Cat X) Type of unshielded twisted pair (UTP) cable.
| Cat 1 | Used for telephone wiring. 1 MHz maximum transmission, which is not suitable for data. |
| Cat 2 | 4 MHz maximum transmission. (4Mbits) |
| Cat 3 | Used for telephone wiring. Was also used for computer networks during the 1990s. |
| Cat 4 | 20 MHz maximum transmission. (16Mbps) |
| Cat 5/5e | 100 MHz maximum transmission. Up to 1000BASE-T (Gigabit Ethernet). |
| Cat 6 | 250 MHz maximum transmission. Up to 10GBASE-T (10-Gigabit Ethernet). |
| Cat 7 | |
| Cat 8 |
Cathode Ray Tube (CRT) Wikipedia
cd Command that displays the name of or changes the current directory. Wikipedia
CDC 6600 Mainframe supercomputer from Control Data Corporation. Delivered January 14, 1965 to CERN. Wikipedia CERN
Celeron CPU made by Intel. Considered a low-end processor. Wikipedia
Central Office (CO) Local service provider building that connects the CPE to the provider network. Wikipedia
Central Processing Unit (CPU) The main processor or "engine" of a computer. Wikipedia
Certbot Automatically enable HTTPS on your website with EFF's Certbot, deploying Let's Encrypt certificates. Website Wikipedia
Certificate Revocation List (CRL) List of digital certificates that have been revoked by the issuing certificate authority (CA) before their scheduled expiration date and should no longer be trusted. Defined in RFC 5280 May 2008. Wikipedia RFC 5280
CES 2018 January 8, 2018 - January 11, 2018. Website Wikipedia Circuit Breacker Live Stream
CES 2019 January 8-11, 2019. Website Wikipedia
CES 2020 January 7-10, 2020 Website Wikipedia
Challenge Handshake Authentication Protocol (CHAP) Performs a one-way authentication for a remote access connection. Authentication is performed through a three-way handshake (challenge, response, acceptance message) between a server and a client, without sending credentials across the network. Specified in RFC 1994, August 1996. Wikipedia RFC 1334 RFC 1994
change mode (chmod) chmod UNIX command used to change access permissions. Example:
chmod -x script_name | Makes a script executable |
Change on Write (COW) Wikipedia
Channel Service Unit/Data Service Unit (CSU/DSU) Layer 1 device. Digital leased lines require both a CSU and a DSU, even if in separate devices. CSU terminates digital signal. DSU converts line frames into frames readable by the LAN. Wikipedia
character A data type. Wikipedia
character encoding Wikipedia W3Schools
chargeback Policy used by IT departments to allocate and/or bill the costs associated with each department's or division's usage. As of 2011, the chargeback mechanisms are often controversial in organizations. Wikipedia
Charles Babbage An English polymath. A mathematician, philosopher, inventor and mechanical engineer, Babbage originated the concept of a digital programmable computer. December 26, 1791 – October 18, 1871. Wikipedia Computer History Museum
charset W3Schools
Chatsworth Website
chcp DOS command that displays or sets the active code page number.
CHDIR Displays the name of or changes the current directory. Wikipedia
checksum A redundancy check. Catches data transmition errors. Typically 32 or 64 bits. Wikipedia
Cheetah (Mac OS X 10.0) Wikipedia
Chief Information Security Officers (CISO)
children (subdirectory) Directories that are within the current directory.
chipset Wikipedia
CHKDSK DOS command that checks a disk and displays a status report. Wikipedia
CHKNTFS DOS command that displays or modifies the checking of disk at boot time. Wikipedia
Chocolatey Package manager for Windows. Website
Chris Allegretta Creator of the text editor nano. Wikipedia
Christmas Tree EXEC First widely disruptive computer worm. Discovered December 9, 1987. Wikipedia Malware Wiki
Chrome Web browser developed by Google. First released September 2, 2008. Website Wikipedia
Chrome OS Operating system developed by Google. Based on Linux. Uses the Chrome web browser as the user interface. First released June 15, 2011. Website Wikipedia
Chromium Open source web browser project which is the foundation for Google Chrome.. Frist released September 2008. Website Wikipedia
chsh Linux command to change the shell.
Chuck Robbins CEO of Cisco. Wikipedia
Cinebench Benchmarking tool. Website Wikipedia
cipher An algorithm for encrypting and decrypting. Methods include: Transposition, Substitution, One-time pad. Wikipedia
Cipher Block Chaining (CBC) DES block cipher. Most widely used mode of DES. Invented by Ehrsam, Meyer, Smith and Tuchman in 1976. Wikipedia
CipherShed Encryption replacement for the late TrueCrypt. Wikipedia Website
circle
| (x-y)2+(y-k)2=r2 |
| (h,k) center |
| r = radius |
circuit-switched network Uses a dedicated path during transmission. PSTN and ISDN are two examples of a circuit-switched WAN. Wikipedia
circumference The perimeter of a circle.
Cisco Networking company based in San Jose, California. Founded in December of 1984. Name derived from San Francisco where Cisco first started. Wikipedia
Cisco Adaptive Security Appliance (ASA) Firewall from Cisco. Two firewall modes of operation: routed mode and transparent mode. Basic configs:
- ciscoasa>
en - Password:
- ciscoasa#
clock set 9:30:00 9 FEB 2014 - ciscoasa#
conf t - ciscoasa(config)#
hostname ASA-1 - ASA-1(config)#
domain-name ccnasecurity.com - ASA-1(config)#
enable password class
- //interfaces
- ASA-1(config)#
interface vlan 1 - ASA-1(config-if)#
description Private inside LAN - ASA-1(config-if)#
nameif inside - INFO: Security level for "inside" set to 100 by default.
- ASA-1(config-if)#
security-level 100 - ASA-1(config-if)#
ip add 192.168.1.1 255.255.255.0
- ASA-1(config)#
interface e0/1 - ASA-1(config-if)#
description Physical inside interface - ASA-1(config-if)#
switchport access vlan 1 - ASA-1(config-if)#
no shut
- ASA-1(config)#
interface vlan 2 - ASA-1(config-if)#
description Public outside connection - ASA-1(config-if)#
nameif outside - INFO: Security level for "outside" set to 0 by default.
- ASA-1(config-if)#
security-level 0 - ASA-1(config-if)#
ip address 209.165.200.226 255.255.255.248
- ASA-1(config)#
int e0/0 - ASA-1(config-if)#
description Physical outside interface - ASA-1(config-if)#
switchport access vlan 2 - ASA-1(config-if)#
no shut
Cisco Adaptive Security Device Manager (ASDM) Browser-based, Java applet used to configure and monitor the software on a Cisco ASA. Netacad
Cisco Adaptive Wireless IPS Software
Cisco AnyConnect Secure Mobility Solutions
Cisco ASA 5505 Firewall made by Cisco. Released August 31, 2006. EoL announced July 18, 2012. Website Wikipedia
Cisco ASA 5510 Firewall made by Cisco. Released May 4, 2005. Website Data Sheet
Cisco AutoSecure Can automatically configure CBAC, security banner, and enable secret password.
Cisco Catalyst 2960-X Series of network switch from Cisco. Announced June 4, 2013. Released July 2013. Website Wikipedia Cisco Blog
Cisco Catalyst 2960X-24PD-L 24-port network switch from Cisco. Released May 24, 2013. Website
Cisco Catalyst 2960X-24PS-L 24-port network switch from Cisco. Released May 24, 2013. Website
Cisco Catalyst 2960X-24PSQ-L 24-port network switch from Cisco. Released May 24, 2013. Website
Cisco Catalyst 2960X-24TD-L 24-port network switch from Cisco. Released May 24, 2013. Website
Cisco Catalyst 2960X-24TS-L 24-port network switch from Cisco. Released May 24, 2013. Website
Cisco Catalyst 2960X-24TS-LL 24-port network switch from Cisco. Released May 24, 2013. Website
Cisco Catalyst 2960X-48FPD-L 24-port network switch from Cisco. Released May 24, 2013. Website
Cisco Certified Entry Networking Technician (CCENT) Website Wikipedia
Cisco Certified Internetwork Expert (CCIE) Wikipedia
Cisco Certified Network Associate (CCNA) Wikipedia
Cisco Certified Network Professional (CCNP) Wikipedia
Cisco Common Classification Policy Language (C3PL) Configures ZBF policies. Cisco
Cisco Connection Online (CCO) Account used on cisco.com. Cisco
Cisco Encryption Technology (CET)
Cisco Express Forwarding (CEF) Default forwarding mechanism used on IOS 12.0 or later. Wikipedia
Cisco High-Level Data Link Control (cHDLC) (aka: Cisco HDLC.) Cisco proprietary version of HDLC. Supports multi-protocol environments. Wikipedia
Cisco IronPort Email Security Appliance
Cisco IronPort Web Security Appliance
Cisco Live San Diego 2019 June 9-13, 2019. Website
Cisco Live US 2018 June 10-14 in Orlando, FL. Website
Cisco NAC appliance Cisco
Cisco NAC Appliance (formerly: Cisco Clean Access (CCA)) Network Admission Control (NAC) system developed by Cisco used to secure a computer network. Wikipedia Cisco
Cisco Network Admission Control (NAC) Allow access and enforces security policy
Cisco Network Foundation Protection (NFP) framework
| control plane | Routes data correctly. Protects against DoS attacks and provides bandwidth control. |
| management plane | Management traffic from Telnet, SSH, TFTP, FTP, NTP, AAA, SNMP, syslog, TACACS+, RADIUS, and NetFlow. |
| data (forwarding) plane | Forwards data. typically user generated data. |
Cisco Networking Academy Netadad
Cisco PIX One of the first NAT appliances. Developed in 1994. Wikipedia History of the PIX Firewall
Cisco ScanSafe Cloud Web Security
Cisco Secure Access Control System
Cisco SecureX architecture
| Delivery Mechanisms | |
| Next-generation Endpoint | |
| Policy Management Consoles | |
| PScanning Engines | |
| Security Intelligence Operations (SIO) | Cloud-based service that connects global threat information. |
Cisco Talos One of the largest commercial threat intelligence teams in the world. Website Cisco
Cisco Unified Computer System (Cisco USC) Line of scalable servers form Cisco. Announced March 2009. First installed September 1, 2009. Wikipedia Cisco Press Release
Cjdns Network protocol. Wikipedia Website
class Group of objects. Wikipedia
class (.class) Java class file Wikipedia
Class A address block 0.0.0.0/8 - 127.255.255.255/8 Wikipedia Wikipedia
Class B address block 128.0.0.0/16 - 191.255.255.255/16 Wikipedia Wikipedia
Class C address block 192.0.0.0/24 - 223.255.255.255/24 Wikipedia Wikipedia
Class D address block Multicast addresses.
Class E address block Experimental addresss.
class libraries Pre-defined classes for common tasks.
classful Only Class A, B, or C address. (10.0.0.0/8, 172.16.0.0/16, 192.168.0.0/24.) Wikipedia
Classic Windows App (CWA) (aka: Win32 app) Application that runs on the traditional Windows desktop.
classless Any class of address. (/8, /25, /30...)
Classless Inter-Domain Routing (CIDR) RFC 1519
Cleanroom suit (aka: bunny suit) Wikipedia
clock signal Wikipedia
clear Command that clears the screen.
Clear-ADAccountExpiration PowerShell cmdlet used to clear the expiration date for an Active Directory account. TechNet
client Device that accesses a server. Wikipedia
Client Access Server (CAS) TechNet
Client-side scripting Wikipedia
clobber Unintentionally overwrite a file. Wikipedia
clock rate The rate data is transmitted. Configured on DCE interfaces. Wikipedia
clock set Set the time and date. Use show clock to display the time in IOS.
clock skew An issue along parallel communication where information does not arrive at the same time. Wikipedia
closed port Nmap port state that does not allow entry or access to a service. A closed port is accessible (it receives and responds to Nmap probe packets), but there is no application listening on it. Not vulnerable to an attack. Website
closed|filtered Nmap port state. This state is used when Nmap is unable to determine whether a port is closed or filtered. It is only used for the IP ID idle scan. Nmap
closure Property of relational operators that permits the end use of relational algebra operators on existing tables (relations) to produce new relations.
cloud computing Off-premise pool of computer resources that can be brought up or down at will. Typically housed in a data center. Wikipedia Netacad
cloud computing deployment model Four types: private, public, community, and hybrid. Wikipedia Netacad IBM developerworks Blog
cls DOS command that clears the screen.
cmd DOS command that starts a new instance of the Windows command interpreter.
Cmdlet Commands used in PowerShell. Follow a Verb-Noun naming convention. (i.e.
CNext (cnext.exe) Radeon Settings. File path: C:\Program Files\AMD\CNext\CNext\cnext.exe
co (.co) A top level domain for Columbia
coaxial Wikipedia
Code Access Security (CAS) Part of the .NET framework. Wikipedia
Code Red Computer worm. Released July 13, 2001. Isolation July 15, 2001. Wikipedia.
Code-Division Multiple Access (CDMA) Wikipedia
Codec Wikipedia
Collaboration Meeting Room (CMR) Collaboration tool combining video, voice, and content sharing. Cisco YouTube
collapsed core model Core and distribution layers collapsed into a single device. YouTube
collision When two or more demands are made simultaneously on equipment that can handle only one at any given instant. (i.e. collision domain) Wikipedia
collision When two distinct pieces of data have the same hash value. Wikipedia
collision domain Physical network segment where data packets may collide with one another while being sent. CSMA/CD and CSMA/CA can be used to detect or avoid collisions on Ethernet or wireless LANs respectively. Wikipedia
color DOS command that sets the default console foreground and background colors. (color a, color b2...)
column Each database table column represents an attribute. Each column has a distinct name.
column list Represents one or more column names separated by commas. May also include computed columns, aliases, and aggregate functions.
com (.com) A generic top level domain for a business or industry.
Comit Wikipedia
Comma-Separated Values (CSV) Wikipedia RFC 4180
Command (⌘) Key found on Apple keyboards. Similar functionality to the Windows Key.
Command Prompt (cmd.exe) CLI Shell for Windows. Wikipedia
Command-Line Interface (CLI) Allows a user to input text commands into a computer. Based off of DOS. Wikipedia
Command-Line Interpreter (CLI) Interprets commands inputted by a user. Wikipedia Wikipedia
COMMAND.COM Shell for DOS and the command line interpreter on Windows 95, Windows 98 and Windows ME. Wikipedia
Commercial Resupply Services Mission 10 (CRS-10) SpaceX's Falcon 9 rocket carried the Dragon spacecraft to low-Earth orbit to deliver critical cargo to the International Space Station for NASA. Launched from NASA's Kennedy Space Center in Florida February 19, 2017. Website Wikipedia
Commodore 64 8-bit home computer from Commodore International. Released August 1982. Wikipedia
Commodore Amiga 1000 (aka: A1000) First personal computer from Commodore. Released July 23, 1985. Wikipedia
Commodore-64 Scene Data Base (CSDB)
Common Address Redundancy Protocol (CARP) Open standard for first-hop redundancy. Provides functionality similar to VRRP and to Cisco's HSRP. Wikipedia
Common Business-Oriented Language (COBOL) programming language Wikipedia
Common Gateway Interface (CGI) Standard environment for web servers to interface with executable programs installed on the server that generate web pages dynamically. Wikipedia
Common Interface Wikipedia
Common Language Infrastructure (CLI) Developed by Microsoft. Wikipedia
Common Language Runtime (CLR) Virtual machine component of Microsoft's .NET framework that manages the execution of .NET programs. Wikipedia
Common Name (CN) TechNet YouTube (Microsoft MCSA/MCSE Learning Channel)
Common Unix Printing System (CUPS) First released release June 9, 1999. Wikipedia
Common Vulnerabilities and Exposure (CVE) Database of security vulnerabilities. Website Wikipedia
Common-Channel Interoffice Signaling (CCIS) Wikipedia
Common-Channel Signaling (CCS) Wikipedia
Community Antenna Television (CATV)
community strings Plaintext passwords. Two types; read-only (ro) and read-write (rw).
COMP Compares the contents of two files or sets of files.
COMPACT DOS command that displays or alters the compression of files on NTFS partitions.
Compact Disc (CD) Optical disc. Typically 700MB. Wikipedia
Compact Disc File System (CDFS) Wikipedia
Compaq Founded February 14, 1982. Acquired by HP in 2002. Wikipedia
Compaq Portable One of the first 100% IBM PC compatible systems. Announced November 4, 1982 Wikipedia
Compare-Object (aliases: compare, diff) PowerShell cmdlet that compares two sets of objects. Example:
Compare-Object $foo $bar |
comparison operator
| greater than | > | -gt |
| less than | < | -lt |
| greater than or equal to | >= | -ge |
| less than or equal to | <= | -le |
| not euqal to | NOT | IS NOT |
| like (matches a pattern) | LIKE |
Compiler Translates source code into machine code the computer can understad. Wikipedia
Compiling The process of translating source code into machine code. Any syntax errors will be found during this step. Wikipedia
Complementary Metal-Oxide-Semiconductor (CMOS) Type of memory. Typically used to store a BIOS configuration. Backed up with a battery. Wikipedia
Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) Wikipedia
Completely Fair Scheduler (CFS) Process scheduler in Linux. Wikipedia
Complex Instruction Set Computing (CISC) The opposite of RISC. Originated in the 1960's. Wikipedia
component video When used without any other qualifications the term component video usually refers to analog YPBPR component video with sync on luma. Typically uses three RCA plugs; red, green, and blue. Wikipedia
composite entity (aka: bridge entity, associative entity) Designed to transform a M:N relationship into two 1:M relationships. Composite entity's primary key comprises at least the primary keys of the entities that it connects.
composite key Multiple-attribute key.
composite video Type of video connection. Commonly used in RCA connectors. Wikipedia
CompTIA A+ 220-901 & 220-902 Released December 15, 2015. Website
CompTIA Cybersecurity Analyst (CSA+) Released February 15, 2017. Website
CompTIA Network+ Released February 28, 2015. Website
CompTIA Security+ Released May 1, 2014. Website
Compute Node Kernel (CNK) Node level operating system for the IBM Blue Gene supercomputer. Wikipedia
Computer Emergency Response Team (CERT) [aka: Computer Emergency Readiness Team, Computer Security Incident Response Team (CSIRT)] Expert group that handles computer security incidents. USA CERT created by the Defense Advanced Research Projects Agency (DARPA) and run by the Software Engineering Institute (SEI) at the Carnegie Mellon University. CERT name first used in 1988 by the CERT Coordination Center (CERT-CC) at Carnegie Mellon University (CMU). SEI Website Wikipedia
Computer Management (compmgmt.msc) Website Wikipedia
Computer Systems Research Group (CSRG) Wikipedia
Computer-Generated Imagery (CGI) Wikipedia
Computex Computer expo in Taipei. First expo in 1981. Website Wikipedia
Computex 2017 May 30 - June 3 Website Wikipedia
Computex 2018 June 5 - June 9 Website Wikipedia
concatenation (cat) Can show one or more files together in the same output. The command split can separate files while cat can merge files. Wikipedia YouTube
confidentiality (encryption) Message can't be read.
congestion control 3 frame-relay congestion-notification bit. (FECN, BECN, ) Wikipedia
conic section
| circle |
| ellipse |
| parabola |
| hyperbola |
connection oriented Must establish a connection before sending data. Wikipedia
console cable Connects through the console port to a host for configuring the device over CLI.
constant-current transformer (aka: current regulators) Generally used to provide power to series connected loads.
containerization (aka: Operating-system-level virtualization) Used to isolate an application. Containers run a single program and all its dependencies. Wikipedia
Content Delivery Network (CDN) Globally distributed network of proxy servers deployed in multiple data centers. Wikipedia
Content Security and Control (CSC) Adds anti-malware capabilities to a Cisco ASA. Website Netacad
Content Security and Control Security Services Module (CSC-SSM) Netacad
Content-Addressable Memory (CAM) Wikipedia
Content-Addressable Memory (CAM) table MAC table Wikipedia
Context-Based Access Control (CBAC)
Context-Free Grammar (CFG) Wikipedia
Control And Provisioning of Wireless Access Points (CAPWAP) Wikipedia
control structure Wikipedia
Controlled media access (controlled access) Devices take turns accessing the media with a token. Can be inefficient with too many devices.
converged network One that transports multiple types of traffic such as voice, video, and data. Most modern netowrks are converged.
convergence The process of failing over from one route to a backup route.
CONVERT DOS command that converts FAT volumes to NTFS.
Cooler Master Computer hardware manufacturer from Taiwan. Founded in 1992. Website Wikipedia
copy Command that copies one or more files to another location in DOS or IOS. Use cp for Bash.
copy on write (COW) Data is not copied until a write is attempted. Stack Overflow Wikipedia
Core Layer The backbone layer between networks. Everything must be fast in this layer. Wikipedia Netacad Netacad
Core Temp Monitor CPU temperature. Website
corrective controls (after the event) Limit the extent of any damage caused by the incident e.g. by recovering the organization to normal working status as efficiently as possible. Wikipedia
Corsair Computer peripherals and hardware company headquartered in Fremont, California. Founded in 1994. Website Wikipedia
CORSAIR DOMINATOR PLATINUM Special Edition Torque Released May 11, 2017. Website
Counter Mode CBC-MAC Protocol (CCMP) Wikipedia
cp Command that copies one or more files to another location in Bash. (copy for DOS.)
CPU cache Fast memory that is used to store data going between main memory and the CPU. Predicts what the CPU will ask for next and prefetches information before it is asked. Each level feeds the next (i.e. Level 3 feeds Level 2 and Level 2 feeds Level 1.)
| L1 | Internal cache built into the processor's silicon wafer, or die. |
| L2 | Can be itegrated on die, backside bus (BSB), or on the motherboard. |
| L3 | Typically integrated on the motherboard. |
| L4 | Uncommon, generally only on DRAM. |
CPU socket Where the CPU is inserted on the PCB. Allows the CPU to easily be placed or replaced without soldering. Wikipedia
CPU-Z Freeware that shows information about the hardware of a computer such as CPU and Motherboard specifications. Website Wikipedia
Cramer's rule Explicit formula for the solution of a system of linear equations with as many equations as unknowns, valid whenever the system has a unique solution. Named after Gabriel Cramer who published the rule in 1750. Wikipedia
Cray One of the early supercomputers. Wikipedia Website
createinstallmedia Terminal command used to create a bootable installer for macOS. Apple Support
Creators Update (aka: Redstone 2 (RS2)) Codename for the third major update build of Windows 10. Early download available April 5, 2017. Released April 11, 2017. Wikipedia
crimper Tool used to make twisted pair network cables.
Critical Structure Corruption BSOD error message that indicates that one or more Windows system files have been modified or corrupted. Tom's Hardware
Cross-Site Scripting (XSS) Security vulnerability typically found in web applications. Allows attackers to inject client-side scripts into web pages viewed by other users. May be used by attackers to bypass access controls such as the same-origin policy. Wikipedia
Crossover Cable (T568A to T568B) An uncommon networking cable. Directly connect like devices together. Wikipedia
crosstalk Interference between twisted-pair copper wires caused by the magnetic field around the adjacent pair of wire. Wikipedia
crunchbang A Linux distribution. Based on Debian.
cryptanalysis Cracking code. Necessary to prove an algorithm is not vulnerable. Netacad
cryptographic hash function Should have the following properties:
- The input can be any length.
- The output has a fixed length.
- The hash value is relatively easy to compute for any given input.
- The hash is one way and not reversible.
- The hash is collision free, meaning that two different input values will result in different hash values.
cryptographic key symmetric keys, digital signatures, hash keys.
cryptographic keys Several types of cryptographic keys can be generated including:
| Symmetric keys | Can be exchanged between two routers supporting a VPN |
| Asymmetric keys | Used in HTTPS applications |
| Digital signatures | Used when connecting to a secure website. |
| Hash keys | Used in symmetric and asymmetric key generation, digital signatures |
cryptography Wikipedia Khan Academy
CryptoLocker ransomware trojan Wikipedia
cryptology The science of making and breaking secret codes. Wikipedia
Crysis First released November 13, 2007. Website Wikipedia Wikipedia (Series)
Crysis 2 First released March 22, 2011. Website Wikipedia
Crysis 3 First released February 19, 2013. Website Wikipedia
Crysis Warhead First released September 16, 2008. Website Wikipedia
current (I) Wikipedia
Current Branch (CB) Windows update/support branch for Windows 10 Home, Pro, Education, and Enterprise. Wikipedia
Current Branch for Business (CBB) Windows update/support branch for Windows 10 Pro, Education, and Enterprise. Wikipedia
Customer Premises Equipment (CPE) Devices and wiring located on the enterprise edge, connected to a carrier link. Wikipedia
Cyan, Magenta, Yellow, Key (black) (CMYK) color model Wikipedia
Cyanogen Mobile operating system based on Android. Cyanogen OS is what comes pre-installed on phones such as the OnePlus One. CyanogenMod is a replacement firmware that installs on top of Android. Fist released July 1, 2009. Website Twitter
Cyclic Redundancy Check (CRC) Similar to a hash. Wikipedia