ow the <a href=/v1.10/docs/ops/configuration/traffic-management/protocol-selection/#explicit-protocol-selection>Explicit protocol selection</a> steps to declare the protocol of the application as <code>TCP</code>.</p><p>The following ports are known to commonly carry server first protocols, and are automatically assumed to be <code>TCP</code>:</p><table><thead><tr><th>Protocol</th><th>Port</th></tr></thead><tbody><tr><td>SMTP</td><td>25</td></tr><tr><td>DNS</td><td>53</td></tr><tr><td>MySQL</td><td>3306</td