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The usual default
service
port for SMTP
is port 25 and requests on port 110 go to the email POP3 application
for receiving and sending email messages.
Each of the services that the machine performs is done by a program. Each program does
something called listening on a port.
A
port number is actually a number between 1 and 65535 which
identifies to the receiving computer what function you want to
perform.
Sometimes I
think of the internet as a kind of
black box. I often refer to an old cartoon which shows a scientist writing a
huge equation across a blackboard.
The equation
covers the left side and right
side of the blackboard, and in the middle is the words "and the a miracle
occurs."
That's how most
people think of the internet. They
browse the internet and send email and just assume that some kind of
voodoo-like magic sends and receives the information.
Actually, there is
about as much magic involved as there is in an engine for a car.
The internet is just a huge machine, made up of smaller machines, which are in
turn made up of yet smaller machines.
One of the major components (if you can call it that) of the internet is TCP/IP. If the
internet were a body, then TCP/IP would be the nerve impulses which make it do
things (that's a very rough analogy, but it will serve).
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