✅ Virtual Memory allow process to be run outside of memory when process does not fit the existing memory ✔️ Functions of Virtual Memory Simplified management of memory: each proc...

✅ Kernel interface interface between hardware and processes(software) most crucial part of OS that is always on the memory core component of OS manage compute resources c...

✅ MQTT Message Qeuing Telementry Transport protocol for transporting messages between IoT devices 👍🏻 require low computing power 👍🏻 require less bandwidth 👍🏻 good for device with les...

🆚 Difference: 공통점: used to perform read and write operations 차이점: How to use it in network programming ✅ IO Input, Output 1️⃣ blocking process waits until data operation fin...

How to achieve reliable data transmission over unreliable source/service ✅ Packet corruption 패킷 손상 bit error inside packet often occur in physical layer 💊 ARQ: retransmit ✅ Packet loss ...

✅ MTU Maximum Transmission Unit 패킷 또는 프레임 기반 네트워크에서 전송될 수 있는 최대 크기 패킷, 프레임 한 번에 전송할 수 있는 최대 전송량 byte MTU would depend on environment Ethernet environment: MTU 1500 FDDI environment: ...

📌 UDP ✅ What is UDP? - User Datagram Protocol - conectionless - unreliable - check just data error with checksum ✅ What are the benefits of UDP? and the disadvantages? 👍🏻 fast 👍🏻 les...

✅ Huffman coding 문자의 빈도수를 가지고 압축하는 과정 assign variable length code to input characters, lengths of the assigned codes are bsed on the frequencies of corresponding characters 부모 노드를 만들 때 ...

✅ Proxy intermediary between client and server connect two or more applications using same protocol HTTP proxy can function both as server and client Proxy recives HTTP client reques...

📌 SOP, CORS, XXS, CSRF, SQL injection, XML injection ✅ What is origin? - protocol ➕ host ➕ port ✅ What is SOP? - Same Origin Policy - resource can be shared only between same server/same d...