1.5 Identify commonly used default network ports
Layer 4, the Transport layer, uses ports to indicate the protocol that is to receive the payload/content of the TCP or UDP packet. There are 65,535 potential ports. See http://www.iana.org/assignments/port-numbers for a current complete list of ports and protocol associations. There are a number of common protocol default ports you need to know for this exam. Those specified on the official CompTIA Security+ 2011 objectives are listed here. All listed ports are default ports, meaning custom configurations can use alternate port selections.
FTP FTP uses TCP ports 20 (data) and 21 (control).
SFTP SFTP, or SSH secured FTP, uses TCP port 22.
FTPS FTPS, or FTP over SSL, uses TCP ports 990 (control channel) ...
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