HANNAM UNIVERSITY 1 22 장 OSI 상위계층 22.1 세션 (session) 층 22.2 표현 (presentation) 층 22.3 응용 (application) 층 22.4 요약.

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Presentation transcript:

HANNAM UNIVERSITY 장 OSI 상위계층 22.1 세션 (session) 층 22.2 표현 (presentation) 층 22.3 응용 (application) 층 22.4 요약

HANNAM UNIVERSITY 세션층

HANNAM UNIVERSITY 3 세션층 ( 계속 )  서비스  응용간에 이루어지는 대화 연결과 해제 제어  데이터 교환을 위한 동기점 제공  언제, 누구에게 보내는가에 대한 제어  세션이 끝나기 전에 데이터 교환이 완료

HANNAM UNIVERSITY 4 세션층 ( 계속 )  세션층과 전송층의 상호 대화  전송층은 작업의 일부만 수행할 수 있지만, 세션층은 작업을 모두 완료하거나 아니면 아예 하지 않아야 한다

HANNAM UNIVERSITY 5 세션층 ( 계속 )  세션층 대 전송층 통신

HANNAM UNIVERSITY 6 세션층 ( 계속 )  동기점 (Synchronization point)

HANNAM UNIVERSITY 7 세션층 ( 계속 )  세션 PDU

HANNAM UNIVERSITY 표현 (presentation) 층

HANNAM UNIVERSITY 9 표현층 ( 계속 )  변환

HANNAM UNIVERSITY 10 표현층 ( 계속 )  암 / 복호화

HANNAM UNIVERSITY 11 표현층 ( 계속 )  암 / 복호화 방법

HANNAM UNIVERSITY 12 표현층 ( 계속 )  관용 키 방법  DES(data encryption standard)

HANNAM UNIVERSITY 13 표현층 ( 계속 )  공개 키 방법

HANNAM UNIVERSITY 14 표현층 ( 계속 )  RSA 암 / 부호화  Rivest, Sharmir, Adleman

HANNAM UNIVERSITY 15 표현층 ( 계속 )  인증

HANNAM UNIVERSITY 16 표현층 ( 계속 )  데이터 압축

HANNAM UNIVERSITY 17 표현층 ( 계속 )  무손실 압축  실행 길이 압축 (Run Length Compression)  통계적인 압축 (Statistical)  Morse Code  Muttman Coding  Lempel-ziv coding  비례 압축 (Relative)  손실 압축

HANNAM UNIVERSITY 18 표현층 ( 계속 )  실행 길이 부호화

HANNAM UNIVERSITY 응용 (Application) 층  MHS(Message Handling System)  FTAM(File Transfer, Access, and Management)  VT(Virtual Terminal)  DS(Directory Service)  CMCP(Common Management Information Protocol)

HANNAM UNIVERSITY 20 응용층 ( 계속 )  MHS(Message Handling System)

HANNAM UNIVERSITY 21 응용층 ( 계속 )  메시지 형식

HANNAM UNIVERSITY 22 응용층 ( 계속 )  FTAM(File Transfer, Access, and Management)

HANNAM UNIVERSITY 23 응용층 ( 계속 )  VT(Virtual Terminal)  Local Access

HANNAM UNIVERSITY 24 응용층 ( 계속 )  VT(Virtual Terminal)  Remote Access

HANNAM UNIVERSITY 25 응용층 ( 계속 )  Virtual Terminal

HANNAM UNIVERSITY 26 응용층 ( 계속 )  DS(Directory Service)  ITU-T X.500  DIB(directory information base)  DUA(directory user agent)  DSA(directory system agent)

HANNAM UNIVERSITY 27 응용층 ( 계속 )  CMIP(Common Management Information Protocol)  CMIS(Common Management Information Service)  Fault management  Accounting management  Configuration and name management  Performance management  security management

HANNAM UNIVERSITY 요약