Transmission Control Protocol TCP is a connection-oriented protocol it creates a virtual connection between two TCPs to send data. In addition, TCP uses flow and error control mechanisms at the transport level. 에러 검출, 복구 및 흐름 제어(Layer 4)에 충실한 통신 프로토콜 TCP 클라이언트 - 서버 간 연결 요청, 응답, 최종 결정 에러 검출, 흐름 관련 메커니즘이 있다. 일반적인 동영상 스트리밍 TCP(에러 검출 및 복구) or UDP(빨리 빨리) 둘 중 하나를 쓰든 상관 없다. -> TCP를 씀 버퍼링 - 오류가 아니라, 버퍼에..

UDP User Datagram Protocol The User Datagram Protocol (UDP) is called a connectionless, unreliable transport protocol. It does not add anything to the services of IP except to provide process-to-process communication instead of host-to- host communication. If UDP is so powerless, why would a process want to use it? Very simple protocol using a minimum of overhead if a process wants to send a sma..

Process-to-Process Delivery The data link layer is responsible for delivery of frames between two neighboring nodes over a link. This is called node-to-node delivery. -> 서로 다른 계층, ex) 1 - 2 계층 간 주고 받을 때 The network layer is responsible for delivery of datagram between two hosts. This is called host-to-host delivery. -> 동일한 계층끼리 주고받을 때 (host) 앞서 살펴본 1,2 그리고 3 계층 이야기 The transport layer is respons..

Packetizing packetizing -> 위에서 받은 것에, 본인이 해야할 일, 즉 정보를 넣는다. Encapsulating the payload in a network- layer packet at the source and decapsulating the payload from the network-layer packet at the destination In other words, one duty of the network layer is to carry a payload from the source to the destination without changing it or using it. The network layer is doing the service of a carrier such..

CSMA / CD (이더넷, 초고속 인터넷, 광 랜, IEEE 802.3) Carrier Sense Multiple Access with Collision Detection (CSMA/CD) augments the algorithm to handle the collision. In this method, a station monitors the medium after it sends a frame to see if the transmission was successful. If so, the station is finished. If, however, there is a collision, the frame is sent again. 한 줄을 여러 명이 동시에 사용한다. 쏘기 전에 누가 쏘고 있는지 확인..

* OSI 7 Layer 컴퓨터 소프트웨어와 하드웨어를 통신 관점에서 이해하는 모델 The Open Systems Interconnection model (OSI model) is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard protocols. The model pa..

컴퓨터란? A computer is a device that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming. Modern computers have the ability to follow generalized sets of operations, called programs. These programs enable computers to perform an extremely wide range of tasks. 다양한 종류의 컴퓨터들이 있다. (데스크탑, 서버 컴퓨터, 태블릿, 스마트폰, 웨어러블 장치, IoT, 로봇, 드론 등등) 네트워크 규모에..