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...

✅ Bandwidth maximum capacity of a wired or wireless communications to transmit data over a network connection in a given amount of time maxmimum amount of bits that can be transmitted in spec...

✅ Multi Processing several CPUs each CPU can execute different task parallel processing in process, work in parallel operate multiple jobs at the same time 👍🏻 reduce ...

✅ Time Complexity time taken by an algorithm to run as a function of the length of the input 시간복잡도: 입력 크기 n에 대해 걸린 시간을 함수T(n)로 표현 상수는 1로 취급 가장 영향력이 큰 값(dominant)만을 나타낸다. Exampl...

✅ Spanning Tree all nodes are connected to be part of tree undirected graph ✅ Spanning Tree Algorithm When there are several ways to reach a switch, bridge, looping occurs spanning tr...