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An international, virtual network based information service composed of Internet host computers that provide on line information. ... View more

A file transfer protocol, written in 1977 by Ward Christiansen. This protocol was effective but slow. Later versions (X-Modem2 and X-Modem1K) were als... View more

The X.25 protocol is a widely available, low speed, packet switched data service. It offers data rates below those of Frame Relay and in today's next ... View more

X.400 is the universal protocol for email. X.400 defines the envelope for email messages so all messages conform to a standard format. ... View more

The ITU X.500 family of standards defines X.500 directory services. The directory can be used for many applications, such as storing certificates, or ... View more

X.509 is the ITU recommendation that defines the format for digital certificates and CRL (Certificate Revocation Lists). X.509 applications include X.... View more

Term used for all forms of technology using a DSL (Digital Subscriber Line). DSL enables simultaneous two way transmission of voice and high speed dat... View more

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