MÔ HÌNH THAM KHẢO OSI

Trình bày: Ngô Bá Hùng
Khoa Công Nghệ Thông Tin
Đại Học Cần Thơ
Mô hình tham khảo OSI
(Open System Interconnection Model)
Đợc phát triển bởi tổ chức tiêu chuẩn thế giới ISO
(International Standard Organization)
Gồm có 7 tầng:
Tầng vật lý (Physical layer)
Tầng liên kết dữ liệu (Data link layer)
Tầng mạng (Network layer)
Tầng vận chuyển (Transport layer)
Tầng giao dịch (Session layer)
Tầng trình bày (Presentation)
Tầng ứng dụng (Application layer)
M« h×nh tham kh¶o OSI
M« h×nh tham kh¶o OSI
Interface 4/3
Application
Protocol
Mô hình tham khảo OSI
Tầng vật lý (Physical layer)
Truyền tải các bit thô (raw bit) trên một kênh truyền vật
lý
Định các chuẩn thiết kế:
Cách nối kết các máy
Mức điện thế, .
Cấu trúc các đầu nối,
Phơng pháp truyền tải

Các phần mềm, dịch vụ: Email, Web, FTP, . . .
Cho phép ngời phát triển định nghĩa các protocol của ứng dụng:
HTTP, SMTP, POP,IMAP
M« h×nh tham kh¶o OSI
n+1
entity
n
entity
n-SDU
n-SAP
n+1
entity
n
entity
n-SDU
n-SAP
n-SDU H
n-SDU H
n-PDU
 n Entity (thùc thÓ) mét
qu¸ tr×nh ë líp n
 SAP = Service Access
Point
 SDU = Service Data
Unit
 PDU = Protocol Data
Unit
 H=Header
n+1-PDU
Đại Học Cần Thơ - Khoa CNTT- Ngô Bá Hùng

Bưu điện Paris
Trung tâm phân
loại Paris
Sân bay
ở Paris
Sân bay
Tân Sơn Nhất
Trung tâm phân
loại TPHCM
Bưu điện
Cần Thơ
Ví dụ về phân tầng
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