The Computer Networks are the study of defining communication methods for communication between devices. So in my opinion, it is no exaggeration that a protocol which is a set of rules and guidelines for communicating data is almost everything about in the Computer Network field.
Fig 1. OSI 7 Layer.
Fig 2. Overview of the TCP/IP model network.
ref: https://juicyjerry.tistory.com/entry/네트워크HTTP-모의면접-질문-리스트
TCP/IP의 흐름제어(Flow Control)와 혼잡제어(Congestion Control)
Bandwidth, Throughput and Data rate
Flow table, Forwarding table, Routing table