Understanding of inbound and outbound in cacti switch port image

The specific image is as follows:

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The terminal IP connected under port 21 is 10.240.240.69.

2. Machine download files from external

   At this point, the corresponding 21 port direction is outbound, that is, the external packet (the downloaded software) passed through the port (from 21 ports) to the machine
   

   The machine at around 14:12 to use the Thunderbolt download (shown in the figure of Port 21 outbound traffic soared in the moment), 14:18 minutes later limit the download speed (shown in the figure of outbound traffic under port 21 In this period of steep reduction), and then limit the download speed 3333kb/s(shown in the figure of Port 21 outbound traffic soared in that time, then maintain the horizontal line, until around 14:32 download);
   

4. The machine uploads files externally

   At this point, the corresponding 21 port direction is inbound, that is, the packets sent by the machine are forwarded to the target server via 21 ports (inflow 21 port)
   

   around 14:40 , the machine to the intranet to another server upload files (shown in the figure of Port 21 inbound traffic soared in that period, reached 10mb/s, corresponding traffic graph bandwidth of 100mb/s)

6. Analysis diagram

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Understanding of inbound and outbound in cacti switch port image