ISDN, Integrated Services Digital Network, is a digital communication service provided by telcos.

An Inverse Query is a Domain Name System (DNS) query in which a resolver contacts a name server to perform a reverse name lookup, requesting a host name for a given IP address.

Definition of Internetwork Operating System (IOS) in Network Encyclopedia. What is IOS (Internetwork Operating System)? IOS is an operating system developed by Cisco Systems for its line of...

Intelligent Hub is a hub that is enabled for remote monitoring and management through Simple Network Management Protocol (SNMP).

Definition of Internet service provider (ISP) in The Network Encyclopedia.

Learn what ISAPI is. Stands for Internet Server Application Programming Interface. Also in this article: ISAPI extension, ISAPI filter.