The OSI Model
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- Feb, 05, 2011
- Angelo Schalley
- Cisco, Networking
Upper Layers
Layers 7 through 4 comprise the upper layers of the OSI protocol stack. They are more geared to the type of application than the lower layers, which are designed to move packets, no matter what they contain, from one place to another.
The mystery revealed – ftp active vs passive
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- Jan, 26, 2011
- Angelo Schalley
- FTP, Networking, Plesk Linux, security
Active ftp mode
Client starts connection with server on port TCP 21
Servers tells client to start listning on a port higher then TCP 1024
Server starts sending data traffic from TCP 20 to the TCP 1024 or higher port
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