Dial-up

A virtual circuit connection established across a network on an asneeded basis and lasting only for the duration of the transfer. A virtual circuit that must be rebuilt each time it is used; similar to a dial-up connection.
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The network portion of an IP address. For a class A network, the network address is the first byte of the IP address. For a class B network, the network address is the first 2 bytes of the IP address. For a class C network, the network address is the first 3 bytes of the IP address. In the Internet, assigned network addresses are globally unique.
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Refers to the local, long distance, and international phone system that we use every day. In some countries, it is a single phone company. In countries with competition, PSTN refers to the entire interconnected collection of local, long distance, and international phone companies, of which there could be thousands.
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(1) Restoration of a system to its former condition after it has switched to a fallback mode of operation when the cause of the fallback has been removed. (2) The restoration of the database to an original position or condition often after major damage to the physical medium.
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Access for authorized users external to an enclave established through a controlled access point at the enclave boundary. The ability to dial into a computer over a local telephone number using a number of digital access techniques.
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