# Port Numbers / Session Multiplexing

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A session is an exchange of data between two or more communicating devices.
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<figure><img src="https://1474932522-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FAgItg4KAZpnXjAFPWRf8%2Fuploads%2Fen83g1FWsih9eVF5w0Pn%2FScreenshot%20from%202023-07-11%2018-06-20.png?alt=media&#x26;token=ab814570-867c-4ee6-99e6-907f221c05b7" alt=""><figcaption></figcaption></figure>

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<figure><img src="https://1474932522-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FAgItg4KAZpnXjAFPWRf8%2Fuploads%2FkOTVfbrcv804exiRK2RB%2FScreenshot%20from%202023-07-11%2018-07-02.png?alt=media&#x26;token=6ceaf3c8-227e-472d-aaa0-606844f0fb30" alt=""><figcaption></figcaption></figure>