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2022.12.03.Sat. 수정 Firewall What are Firewalls? Firewall(방화벽) V3, 알약 - 방화벽 제공 -> Host firewall network 전체 방화벽: Network firewall => 단순 firewall (문맥상만 구분) Motivation 신뢰X 외부 네트워크 접근/공격으로부터 내부를 보호 공격에 대해 각 호스트를 업그레이드/교체하기 시스템 전체의 기본적인 방어 제공 내부 보안 ↑ -> 시설 교체/ 시스템 업그레이드 but 비용 ↑ -> 방화벽 => 저비용 고효율 solution 로깅 ~> 보안 관리, 추적 등 용이 Definitions 3가지 설계 목표(-> 1번만 만족시켜도 ok) A collection of compo..

Attacks on the TCP protocol TCP client and server programming Recap: TCP Client Program Create a socket specify the type of communication. TCP -> SOCK_STREAM/ UDP -> SOCK_DATAGRAM Inititae the TCP connection Send data Recap: TCP Sercer Program 1. 소켓 생성 2. 주소 bind App needs to register a port number on its host computer. the packet arrives at the host -> the OS knows which App is the receiver bas..

Sniffing and Spoofing Part1 Network Basics Revisited Network Hardware Hubs(=(multi-port) repeater): A hub is generally a box with multiple RJ-45 ports No more than a repeating device that operates on the physical layer ex. if com 포트 1 of a 4-prot hub -data-> com 포트2, the hubs sends those pacekts to prots 2,3, and 4 => hubs broadcast data to every port, and each non-destination computer discards ..

9. DNS and DNS attack DNS Hierarchy, Zones, and Servers DNS Domain Hierarchy Domain namespace is organized in a hierarchical tree-like structure Each node is called a domain OR subdomain when referencing to parent The root of the domain is called ROOT, denoted as '.' Below ROOT, we have Top-Level Domain(TLD)_ex. In www.example.com, the TLD is .com. The next level of domain hierarchy is second-le..

Spring Boot 3.x 를 이용한 RESTful Web Services 개발 | Notion0. Web Service & Web Application0123suh.notion.site

스프링부트 개념정리(이론) | Notion스프링이란0123suh.notion.site