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HTTP
server: The server running hyper
text transfer protocol; commonly known as a web server. HTTP is
run through web server software such as Apache and hosted (stored) on a
network computer. Within the web servers' directory structure, pages of
text, HTML, Java, PHP, etc., can be accessed by other network computers
through
either an IP address
"192.168.111.00" or a domain name like "www.systemstatus.com". Typical
accesses to a HTTP server are from web browsers such as Microsoft IE,
Netscape, Mozilla, Opera.
SMTP
server: The email server running
simple mail transfer protocol; SMTP servers send and receive incoming
and outgoing email messages to and from other SMTP servers. No mail is
stored within a SMTP server, but rather delivered as a mailman delivers
speedy deliveries. SMTP servers are responsible for routing email to
POP accounts. SMTP addresses such as "mail.systemstatus.com" are
normally named through canonical domain names. Common SMTP email
servers are Sendmail and Exim.
POP
server: The server (aka. daemon)
called post office protocol; POP servers retrieve email from POP
accounts, accessed by email clients like Pegasus, Outlook Express,
Eudora, etc. Technically POP servers are completely separate from SMTP
servers, but in order to run efficiently they need to work together.
POP servers are setup with common canonical domain names such as
"pop.systemstatus.com" or "mail.systemstatus.com".
FTP
server: The server responsible for
file transfer protocol; FTP is used to upload and download files,
such as web pages, images, etc. to and from a directory on a network
computer. Files downloads take place both via FTP and HTTP, but FTP is
still more robust and it does not interfere with web server traffic.
Regular FTP access requires a username and password, whereas Anonymous
FTP does not require authentication. Anonymous FTP servers are commonly
used for seamless web downloads. A file transfer protocol server could
be accessed through the canonical domain name, "ftp.systemstatus.com".
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