2.5 Security The FreeBSD security model has been developed over 40 years of evolving application needs. The key insight is that security must be part of system design; it cannot be successfully added later. The model addresses many different goals:Support authenticated local and remote access by multiple users, as well as integration with distributed authentication and directory servicesAllow us..

9. main memory - memory management 목표 – provide a convenient abstraction for programming (인터페이스) - Batch programming – program이 직접 physical address를 사용한다. - process 하나만 있던 시절에는 상관 없었음 -> multiple process – 메모리 관리의 필요성 발생 - 문제점 1) multiple process 2) 메인 메모리보다 큰 프로세스 (ex) 게임) -> Virtual memory 등장 : process 내부에서는 virtual, logical address 사용, 실제 RAM의 주소는 physical address - secondary storage, memory를..