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Generally, a hacker is anyone who experiments with technology - including computers and networks.

A device uses the hardware monitor to observe temperature, voltage and fan speed readings.

This is a type of encryption that transforms plain text input into encrypted output of a

fixed length called the message digest. See also Message Digest.

A bit-oriented (the data is monitored bit by bit), link layer protocol for the transmission of

data over synchronous networks.

In STP, this is the time interval in seconds between configuration messages generated by the root device.

Hexadecimal notation is a base-16 number as opposed to decimal (base-10) or binary (base 2).

This number representation uses 0-9 along with the letters a-f to represent the (decimal) numbers 10 to 15.

The right-most digit represents ones, the next represents multiples of 16, then 16 squared (256),

16 cubed (4096) and so on. MAC addresses are usually written in hexadecimal notation,

for example 00:a0:c5:01:23:43.

Hop count is a measure of distance between two points on the Internet. It is equivalent to the

number of gateways that separate the source and destination.

Any computer on a network that is a repository for services available to other computers on the network.

It is quite common to have one host machine provide several services, such as WWW and USENET.

Hotspots are public areas, such as airports, hotels, coffee shops, where end users can

access the Internet via a mobile device.

The most common protocol used on the Internet. HTTP is the primary protocol used for web

sites and web browsers. It is also prone to certain kinds of attacks

HyperText Transfer Protocol over Secure Socket Layer, or HTTP over SSL is a web protocol

that encrypts and decrypts web pages. Secure Socket Layer (SSL) is an application-level protoco

l that enables secure transactions of data by ensuring confidentiality (an unauthorized party cannot

read the transferred data), authentication (one party can identify the other party) and data integrity

(you know if data has been changed).