central tunneling
In VPN technology, central tunneling is the process of forcing all traffic from a remote VPN through a central site. Central tunneling allows additional security as remote VPN users are protected by a firewall at the central site, and also enables NAT, IDS, IPS and anti-virus and spam filtering. Central tunneling does increase bandwidth at the central site.
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- centralized network
A type of network where all users connect to a central server, which is the acting agent for all communications. This server would store both the communications and the user account information. Most public instant messaging platforms use a centralized network. Also called centralized server-structure.
- centrex
Short for central office exchange service, a type of PBX service in which switching occurs at a local telephone station instead of at the company premises. Typically, the telephone company owns and manages all the communications equipment necessary to implement the PBX and then sells various services to the company.
- certification
In computer-based training (CBT) also called computer-assisted instruction (CAI), certification refers to both the program and the process a student must go through to obtain certification in the studied area. Certification also includes testing and assessment that must be met by the learner with a minimum acceptable score.
- certification authority
Abbreviated as CA, a trusted third party organization or company that issues digital certificates used to create digital signatures and public-private key pairs. The role of the CA in this process is to guarantee that the individual granted the unique certificate is, in fact, who he or she claims to be. Usually, this means that […]
- chad
Confetti-like pieces of paper formed from punch cards or paper tapes. May have been derived from the word Chadless keypunch, which did not create the confetti-like substance; therefore, it was assumed the stuff created must then be called chad. U.S. Navy teletype machines produced chad from paper tape since before the Korean War. Chad was […]