- hacker
A person who carries out hacking on a computer software program. - See also [cracker]
- hacking
The process of deconstructing computer software in an effort to understand how it works and to improve it. - See also [cracking]
- half-duplex
A connection in which data is transmitted in both directions, but not simultaneously. Compare with full-duplex.
- handshake
The initial communication between two data communication devices, during which they agree on protocol and transfer rules for the session.
- hardware address
The hardware-encoded MAC address that is burned into every NIC.
- hardware loopback
A device that is plugged into an interface for the purposes of simulating a network connection and thus enabling the interface to be tested as if it is operating while connected.
- High-Speed Token Ring
A version of Token Ring that has a maximum speed of 100Mbps. This is in contrast with other Token Ring standards, which have maximum speeds of 4Mbps or 16Mbps.
- hop
The means by which routing protocols determine the shortest way to reach a given destination. Each router constitutes one hop; so if a router is four hops away from another router, there are three routers, or hops, between itself and the destination. In some cases, the final step is also counted as a hop.
- host
Any computer system on a network. In the UNIX world, any device that is assigned an IP address.
- host ID
An identifier used to uniquely identify a client or resource on a network.
- hostname
A name that is assigned to a system for the purposes of identifying it on the network in a more user-friendly manner than by the network address.
- HOSTS file
A text file that contains hostname-to-IP address mappings. All commonly used platforms accommodate static name resolution using the HOSTS file.
- hot site
A disaster recovery term used to describe an alternate network site that can be immediately functional in the event of a disaster at the primary site.
- hot spare
In a RAID configuration, a drive that sits idle until another drive in the RAID array fails; at which point, the hot spare takes over the role of the failed drive.
- Hotspot
An area in which an access point provides public wireless broadband network services to mobile visitors through a WLAN. Hotspots are often located in heavily populated places such as airports, hotels, and coffee shops.
- hot swap
The removal and replacement of a component in a system while the power is still on and the system is functioning.
- HSSI (High Speed Serial Interface)
The network standard for high-speed serial communications over WAN links. Includes various T-carrier technologies.
- HTTP (Hypertext Transfer Protocol)
An application layer protocol used by Web browsers to transfer pages, links, and graphics from the remote node to the user's computer.
- HTTPS (Hypertext Transfer Protocol Secure)
A protocol that performs the same function as HTTP but does so over an encrypted link, ensuring the confidentiality of any data that is uploaded or downloaded. Also referred to as S-HTTP.
- hub
A hardware device that acts as a connection point on a network that uses twisted-pair cable. Also known as a concentrator or a multiport repeater.
- HyperTerminal
A Windows-based communications program that allows users to establish host/shell access to a remote system.
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