Brother DCP-8065DN Manuale - Pagina 7
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5: Technical Information
6.1: FTP Explained
FTP is another type of protocol used for exchanging data between two computers, usually a
PC and a server. It uses two separate channels, the command and data channel. The
command channel is used to establish a connection between the two computers and
communicating any other information such as directory structures, privileges etc. The data
channel is used for data transfer.
6.2: Port numbers explained
Port numbers are used to channel data through to the appropriate program over the web. For
example, port 25 is used to route most email traffic to email software such as Microsoft®
Outlook. If ports were not used, then emails would not know where to go. Since FTP is
another type of communication and uses the web as transport, it too has an associated port
number, which are used to standardise the way we communicate over the web. These
numbers were created and are regulated by an organisation called Internet Assigned Number
Authority (IANA). Previous to IANA, companies would standardise their own rules for
communicating, which was great for internal communication but had limitations when dealing
with the outside world.
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