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How to use telnet to test connectivity to TCP ports
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How to use telnet to test connectivity to TCP ports
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![Chapter 2] 2.7 Protocols, Ports, and Sockets](http://web.deu.edu.tr/doc/oreily/networking/tcpip/figs/tcp2_0206.gif "Chapter 2] 2.7 Protocols, Ports, and Sockets")