User manual

Appendix F
178
Name server
Programs called name servers constitute the server half of the DNS
client-server mechanism. A name server contains information about a
segment of the DNS database and makes it available to a client called a
resolver. A resolver is often just a library routine that creates queries
and sends them across a network to a name server.
NAT
see Network Address Translation (NAT)
Network Address Translation (NAT)
A mechanism for reducing the need for globally unique IP addresses.
NAT allows an organization with addresses that are not globally unique
to connect to the Internet by translating those addresses into globally
routable address space. Also known as Network Address Translator.
Network Time Protocol (NTP)
A protocol built on top of the Transmission Control Protocol (TCP) that
synchronizes the time of a local computer client or server to radio clocks
and atomic clocks located on the Internet. This protocol is capable of
synchronizing distributed clocks within milliseconds over long time
periods. Some configurations include cryptographic authentication to
prevent accidental or malicious protocol attacks.
NTP
see Network Time Protocol (NTP)
Packet
The unit of data that is routed between an origin and a destination on the
Internet or any other packet-switched network. The packet includes a
header containing control information and (usually) user data. Packets
are most often used to refer to network layer units of data.
Root name server
On the Internet, the root name server system is the manner in which an
authoritative master list of all top-level domain names (such as .com,
.net, .org and individual country codes) is maintained and made
available.
SCSI
see Small Computer System Interface (SCSI)