Innovations in Internetworking
(https://www.amazon.com/Innovations-Internetworking-Artech-Te...) is a great collection of papers that help you understand the original thinking behind each protocol
The Elements of Networking Style
(https://www.amazon.com/Elements-Networking-Style-Animadversi...) explains why you see only 4 layers in the real Internet while ISO slices it into 7 and all the fun parts os standard bodies while retaining a unique sense of satire
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