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Most protocols issue a special error messagethat is sent back to the source in this case.
The destination computer will likely send back an ICMP Destination Unreachable message to inform the source computer that there is no process listening on the specified port. The source computer can then take appropriate action based on this response, such as notifying the user or terminating the connection attempt.
transport layer
How the hell should the internet know that? Next to you, you stupid cow! You had to post the question from somewhere!
Download means to copy something from somewhere into another place. Typically this is done over the internet from one computer system to another computer system.
A Virtual Private Network (VPN)
Port 80, when speaking of computer terms, refers to the port that uses Hypertext Transfer Transport Protocol. This is a commonly used port for any computer that has internet access by any means.
It depends were you download it, if you get it from the internet or somewhere else then it might be or it might not be. If you download it from an MSN installation wizard that is already on your computer then it is NOT free.
you go to somewhere that has a working internet connection, download the installer executable, place it on a portable memory device of your choice and carry it back to your own computer.
hypertext transport protocol and web browser software
downloading means transferring a copy of file of application from a remote server to your computer. Uploading, by contrast, is sending a file from your computer to a remote machine. The up/down terminology derives from the popular (mis)conception that the internet is somewhere 'up there' in the sky.
Ping is a computer network administration utility used to test the reachability of a host on an Internet Protocol (IP) network and to measure the round-trip time for messages sent from the originating host to a destination computer. Ping is used to identify if there is an internet connection and how fast it is.