NETWORK+ Terms H's Flashcards
A person who carries out
attacks on a computer software program.
See also cracker.
hacker
A connection in which
data is transmitted in both directions
but not simultaneously.
Compare with full duplex.
half duplex
The initial communication between two data communication devices, during which they agree on protocol and transfer rules for the session.
handshake
The hardwareencoded
MAC address burned into
every NIC.
hardware address
A device plugged into an interface for the purposes of simulating a network connection. This enables the interface to be tested as if it is operating while connected.
hardware loopback
An ISO developed bitoriented
synchronous data link layer
protocol used for point-to-point or
point-to-multipoint connections.
HDLC (High-Level Data Link
Control)
The means by which routing protocols determine the shortest way to reach a given destination. Each router constitutes one hop. If a router is four hops away from another router, for example, three routers, or hops, exist between the first router and the destination. In some cases, the final step is also counted as a hop.
hop
Ties the telecommunication room to the end user. Specifically, the horizontal cabling extends from the telecommunications outlet, or network outlet with RJ-45 connectors, at the client end. It includes all cable from that outlet to the telecommunication room to the horizontal crossconnect. The term horizontal crossconnect refers to the distribution point for the horizontal cable.
horizontal cross-connect
Typically refers to any device
on the network that has been
assigned an IP address.
host
A firewall system installed and configured on and used for an individual host. Contrast to a network firewall that provides firewall services for all network nodes.
host firewall
An identifier used to
uniquely identify a client or
resource on a network.
host ID
A name assigned to a system for the purposes of identifying it on the network in a more user-friendly manner than by the network address.
hostname
A text file that contains hostname-to-IP address mappings. All commonly used platforms accommodate static name resolution using the HOSTS file.
HOSTS file
A disaster recovery term used to describe an alternative network site that can be immediately functional in the event of a disaster at the primary site.
hot site
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.
hot spare
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.
hotspot
The removal and
replacement of a component in a
system while the power is still on
and the system is functioning.
hot swap
A Cisco proprietary protocol
used for establishing redundant
gateways.
HSRP (Hot Standby Router
Protocol)
A protocol used by web browsers to
transfer pages, links, and graphics
from the remote node to the user’s
computer.
HTTP (Hypertext Transfer Protocol)
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.
HTTPS (Hypertext Transfer Protocol
Secure)
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.
hub
A Windows-based
communications program that
enables users to establish host/shell
access to a remote system.
HyperTerminal
Equivalent to cycles per second, hertz is the unit of frequency defined as the number of cycles per second of a periodic phenomenon.
Hz (Hertz)
