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Common Ports Essay

349 words - 2 pages

Common Ports
Network ports are logical connections, provided by the TCP or UDP protocols at the Transport layer, for use by protocols in the upper layers of the OSI model. The TCP/IP protocol stack uses port numbers to determine what protocol incoming traffic should be directed to. Some characteristics of ports are listed below:
• Ports allow a single host with a single IP address to run network services. Each port number identifies a distinct service.
• Each host can have over 65,000 ports per IP address.
• Port use is regulated by the Internet Corporation for Assigning Names and Numbers (ICANN).
 ICANN specifies three categories for ports.
• Well known ports range from 0 to 1023 and are assigned to common protocols and services.
• Registered ports ...view middle of the document...

For example, if the server is only being used for e-mail, then shut down ports that correspond to FTP, DNS, and HTTP (among others).

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