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Glossary
splitter conducts telephone signals to your analog tele-
phones or to the NT. DSL signals are sent on to the DSL mo-
dem or DSL router.
dynamic IP address
A dynamic IP address is an IP address valid only for the dura-
tion of one Internet or network session.
Every computer participating in the Internet must have a
uniquely assigned public IP address. Since only a limited
number of such IP addresses is available, they must be used
sparingly. That is why most of the Internet participants who
dial in to the Internet receive a dynamic IP address. They are
called dynamic because every participant receives a new
public address that has not been assigned yet each time she
or he dials in to the Internet.
By contrast, dynamic addresses are usually used in local IP
networks because they are easy to handle, and because us-
ing them avoids incorrect IP address entries or unintentional
double assignments.
file system
A file system saves and manages files on a data medium (for
instance, a hard drive or flash drive). The way the files are
stored varies from one file system to the next.
The different operating systems offer different file systems. In
Windows 7, Windows Vista and Windows XP the file systems
FAT32 and NTFS are used most frequently. The file system of a
data storage medium can be changed, for instance from
FAT32 to NTFS.
firewall
A firewall protects a computer or local network against at-
tacks from the Internet.
Most firewalls work with packet filters, which merely check
the IP addresses and port numbers of incoming and outgoing
data packets and filter the packets according to prescribed
rules.
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