User manual

Cobalt Qube 3 User Manual 259
Digital Subscriber Line (DSL)
A technology for bringing high-bandwidth information to homes and small
businesses over ordinary copper telephone lines. The term xDSL refers to
different variations of DSL, such as asymmetric DSL (ADSL),
high-bit-rate DSL (HDSL) and rate-adaptive DSL (RADSL). If your home
or small business is close enough to a telephone company central office that
offers DSL service, you may be able to receive data at rates of up to
6.1 Mb/s. More typically, individual connections provide from 512 Kb/s to
1.544 Mb/s downstream and about 128 Kb./s upstream. A DSL line can carry
both data and voice signals and the data part of the line is continuously
connected.
DNS
See Domain Name System (DNS).
Domain name
The location of an organization or other entity on the Internet. For example,
the address www.cobalt.com locates an Internet address for the domain
name “cobalt.com” at a particular IP address and a particular host server
named “www.”
Domain Name System (DNS)
The Internet service responsible for translating a human-readable host name
such as cobalt.com into a numeric IP address (111.123.45.67) for TCP/IP
communications.
DSL
See Digital Subscriber Line (DSL).
Dynamic Host Configuration Protocol (DHCP)
A protocol that provides a mechanism for allocating IP addresses
dynamically so that an address can be reused when a host no longer needs it.
Encryption
The transformation of data into a form unreadable by anyone without a
secret decryption key. Its purpose is to ensure privacy by keeping the
information hidden from anyone for whom it is not intended. In the area of
security, encryption is the ciphering of data by applying an algorithm to plain
text to convert it into cipher text.
See also Authentication and Secure Sockets Layer (SSL).
ESMTP
See Extended Simple Mail Transfer Protocol (ESMTP).