Referring to the Transport Layer of the OSI Reference Model. See also OSI Reference Model and Transport Layer.
"Layer 4." YourDictionary, n.d. Web. 07 December 2018. <https://www.yourdictionary.com/layer-4>.
Layer 4. (n.d.). Retrieved December 07th, 2018, from https://www.yourdictionary.com/layer-4
See transport protocol and layer 4 switch.
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