![PDF] Classic TCP/IP applications: TELNET, FTP, SMTP, NNTP and SNMP | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/b81da43dd1c55494b5b77baf781523e22449627a/7-Figure2-1.png "PDF] Classic TCP/IP applications: TELNET, FTP, SMTP, NNTP and SNMP | Semantic Scholar")
PDF] Classic TCP/IP applications: TELNET, FTP, SMTP, NNTP and SNMP | Semantic Scholar
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