A demarc extension is the process of connecting your organizationâs network to a data lineâsuch as a T1, DSL, or POTSâprovided by the telephone company or another vendor.
Legacy system. In computing, a legacy system is an old method, technology, computer system, or application program, of, relating to, or being a previous or outdated computer system.. Often a pejorative term, referencing a system as legacy means that it paved the way for the standards that would follow it.
There are two general types of systems: a host-based IDS (HIDS) and a network-based IDS (NIDS). A NIDS is often a standalone hardware appliance that includes network detection capabilities. It will usually consist of hardware sensors located at various points along the network. It may also consist of software that is installed on various computers connected along the network.