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The Transport Control Protocol (TCP) is a low-level part of the protocol stack used by the Internet. It sits directly above the IP layer and is responsible for making sure that dropped packets are resent.

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I have some question in closing port, I think I got some strange things. When I use execute nmap --top-ports 10 192.168.1.1 it shows that 23/TCP port is open. But when I execute nmap --top … -ports 10 localhost it show that 23/tcp port is closed. Which of them is true? I want to close this port on my whole system, how can I do it? …
asked Jun 30 '14 by user74080