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<td>22</td><td>SSH - Secure Shell</td>
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<td>23</td><td>Telnet</td>
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<td>25</td><td>SMTP - Simple mail Transfer Protocol</td>
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<td>53<td>DNS - Domain Name Server</td>
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<td>69<td>TFTP - Trivial File Transfer (UDP based)</td>
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