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Psion Teklogix 9160 G2 Wireless Gateway User Manual E-15
Appendix E: Glossary
IP
someone attempting to break into the system. It reports access attempts using
unsupported or known insecure protocols.
IP
The Internet Protocol (IP) specifies the format of packets, also called datagrams,
and the addressing scheme. IP is a connectionless, best-effort packet switching
protocol. It provides packet routing, fragmentation and re-assembly. It is combined
with higher-level protocols, such as TCP or UDP, to establish the virtual connection
between destination and source.
The current version of IP is IPv4. A new version, called IPv6 or IPng, is under
development. IPv6 is an attempt to solve the shortage of IP addresses.
IP Address
Systems are defined by their IP address, a four-byte (octet) number uniquely
defining each host on the Internet. It is usually shown in form
192.168.2.254
. This is
called dotted-decimal notation.
An IP address is partitioned into two portions: the network prefix and a host number
on that network. A Subnet Mask is used to define the portions. There are two
special host numbers:
•The Network Address consists of a host number that is all zeroes (for
example,
192.168.2.0
).
•The Broadcast Address consists of a host number that is all ones (for
example,
192.168.2.255
).
There are a finite number of IP addresses that can exist. Therefore, a local area
network typically uses one of the IANA-designated address ranges for use in private
networks. These address ranges are:
10.0.0.0
to
10.255.255.255
172.16.0.0
to
172.31.255.255
192.168.0.0
to
192.168.255.255
A Dynamic IP Address is an IP address that is automatically assigned to a host by a
DHCP server or similar mechanism. It is called dynamic because you may be
assigned a different IP address each time you establish a connection.