Filter and Firewall
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OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
Alcatel-Lucent
DNS
Domain Name System (or Service or Server) (DNS) is an Internet service that
translates domain names into IP addresses. Because domain names are
alphabetic, they are easy to remember. The Internet however, is really based on
IP addresses. Every time you use a domain name, therefore, a DNS service must
translate the name into the corresponding IP address. For example, the domain
name www.example.com might translate to 198.105.232.4.
The DNS system is, in fact, its own network. If one DNS server doesn't know how
to translate a particular domain name, it asks another one, and so on, until the
correct IP address is returned.
FTP
File Transfer Protocol (FTP) is the protocol for exchanging files over the Internet.
FTP works in the same way as HTTP for transferring Web pages from a server to
a user's browser and SMTP for transferring electronic mail across the Internet in
that, like these technologies, FTP uses the Internet's TCP/IP protocols to enable
data transfer.
FTP is most commonly used to download a file from a server using the Internet or
to upload a file to a server (e.g., uploading a Web page file to a server).
NFS
Network File System (NFS) is a client/server application designed by Sun
Microsystems that allows all network users to access shared files stored on
computers of different types. NFS provides access to shared files through an
interface called the Virtual File System (VFS) that runs on top of TCP/IP. Users
can manipulate shared files as if they were stored locally on the user's own hard
disk.
With NFS, computers connected to a network operate as clients while accessing
remote files, and as servers while providing remote users access to local shared
files. The NFS standards are publicly available and widely used.
RTSP
Real Time Streaming Protocol (RTSP) is a standard for controlling streaming data
over the World Wide Web.
RTSP uses RTP (Real-Time Transport Protocol) to format packets of multimedia
content. But whereas H.323 is designed for video conferences of moderately-
sized groups, RTSP is designed to efficiently broadcast audio-visual data to large
groups.
TFTP
Trivial File Transfer Protocol (TFTP) a simple form of the File Transfer Protocol
(FTP). TFTP uses the User Datagram Protocol (UDP) and provides no security
features. It is often used by servers to boot diskless workstations, X-terminals,
and routers.
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