Mô hình OSI - Open System Interconnection là mô hình được tổ chức ISO đề xuất từ 1977 và công bố lần đầu vào 1984. Để các máy tính và các thiết bị mạng có thể truyền thông với nhau phải có những qui tắc giao tiếp được các bên chấp nhận. Mời các bạn cùng tham khảo nội dung bài giảng "Mô hình OSI - Open System Interconnection" dưới đây để hiểu hơn về mô hình này.
Bài giảng Truyền thông dữ liệu - Chương 1: Mô hình tham chiếu liên kết các hệ thống mở (Open Systems Interconnection Reference Model) nêu lên bản chất của mô hình tham chiếu OSI, chức năng của các lớp, trình ứng dụng và một số nội dung khác.
Tầng 1: Tầng vật lý (Physical Layer)
Tầng vật lý định nghĩa tất cả các đặc tả về điện và vật lý cho các thiết bị. Trong đó bao gồm bố trí của các chân cắm (pin), các hiệu điện thế, và các đặc tả về cáp nối (cable). Các thiết bị tầng vật lý bao gồm Hub, bộ lặp (repeater), thiết bị tiếp hợp mạng (network adapter) và thiết bị tiếp hợp kênh máy chủ (Host Bus Adapter)- (HBA dùng trong mạng lưu trữ (Storage Area Network)).
Information-extraction (IE) systems seek to distill semantic relations from naturallanguage text, but most systems use supervised learning of relation-speciﬁc examples and are thus limited by the availability of training data. Open IE systems such as TextRunner, on the other hand, aim to handle the unbounded number of relations found on the Web. But how well can these open systems perform? This paper presents WOE, an open IE system which improves dramatically on TextRunner’s precision and recall. ...
After studying chapter 4 you should be able to: Describe the basic IEEE 802.11 wireless security protections; define the vulnerabilities of open system authentication, WEP, and device authentication; describe the WPA and WPA2 personal security models; explain how enterprises can implement wireless security.
Chapter 15 - Designing effective organizations. After reading the material in this chapter, you should be able to: Describe the four characteristics common to all organizations, explain the difference between closed and open systems, define seven basic ways organizations are structured,...
Computer Security: Chapter 7 - Using Trust for Role-Based Access Control (RBAC) includes Access Control in Open Systems, Proposed Access Control Architecture, TERM server (Basic, Evidence Model, Architecture, Prototype TERM server).
Chapter 5 - LAN architecture. After studying this chapter you will be able to: Identify the seven protocol layers of the Open System Interconnection (OSI) Reference Model, discuss the functional attributes of each layer of the Open Systems Interconnection Reference Model, understanding Putting Data on the Cable and Access Methods.
Lecture Networking essentials plus (3/e) - Chapter 5: Introducing network standards. The main contents of the chapter consist of the following: Open systems interconnection (OSI) model, IEEE 802.x standard, device drivers and OSI.
In this thesis we explore how knowledge management is performed in
open source projects. Open source projects are often perceived as informal,
even unmanaged. Still, they appear to manage knowledge acquisition
and sharing sufficiently well to successfully develop software in such
a distributed environment as the Internet. This thesis aims to explore
that apparent contradiction, and thus complement the currently limited
research in this field.
Good system administrators recognize problems long before anyone asks, "Hey, is the Internet down?" Nagios, an open source system and network monitoring tool, has emerged as the most popular solution for sys admins in organizations of all sizes. It's robust but also complex, and Nagios: System and Network Monitoring, 2nd Edition, updated to address Nagios 3.0, will help you take full advantage of this program.
Android Open Accessory is a new, simple, and secure protocol for connecting any microcontroller-empowered device to an Android smartphone or tablet. This Wrox guide shows Android programmers how to use AOA with Arduino, the microcontroller platform, to control such systems as lighting, air conditioning, and entertainment systems from Android devices. Furthermore, it teaches the circuit-building skills needed to create games and practical products that also take advantage of Android technology.
Building Embedded Linux Systems shows you how to design and build your own embedded systems
using Linux® as the kernel and freely available open source tools as the framework. Written by an active
member of the open source community, the book is structured to gradually introduce readers to the
intricacies of embedded Linux, with detailed information and examples in each chapter that culminate in
describing how Linux is actually put on an embedded device.
Other Linux resources from O’Reilly
Building Embedded Linux Systems Designing Embedded Hardware Linux Device Drivers Linux Kernel in a Nutshell Programming Embedded Systems Running Linux Understanding Linux Network Internals Understanding the Linux Kernel Linux Books Resource Center
linux.oreilly.com is a complete catalog of O’Reilly’s books on Linux and Unix and related technologies, including sample chapters and code examples. ONLamp.com is the premier site for the open source web platform: Linux, Apache, MySQL and either Perl, Python, or PHP....
Using a series of web development examples, this book 'C Programming in Linux' will give you an interesting glimpse into a powerful lower-level world.
C is tight and spare and economical, and in the current world climate people who know C will ensure critical systems keep running.
A knowledge of C is now and has been for years a pre-requisite for serious software professionals and with the recent popularity and maturity of Open Systems this is even more true.
Architectural longevity (the changes in technology and fortune that the platform will undergo during the next three to five years)
•Availability of skills (from lower cost of ownership as well as lower inertia point of view)
•Level of integration required (the amount of system integration work the customer is required to do)
Building Embedded Linux Systems offers an in-depth, hard-core guide to putting together embedded systems based on Linux. Updated for the latest version of the Linux kernel, this new edition gives you the basics of building embedded Linux systems, along with the configuration, setup, and use of more than 40 different open source and free software packages commonly used.
Xen, the open source virtualization tool, is a system administrator's dream. Xen is a free, high-performance virtual machine monitor that lets you consolidate your hardware and finally put those unused cycles to use—without sacrificing reliability, performance, or scalability.
The Book of Xen explains everything you need to know in order to use Xen effectively, including installation, networking, memory management, and virtualized storage.
A systematic control design methodology is introduced for multi-input/multi-output stable
open loop plants with multiple saturations. This new methodology is a substantial improvement
over previous heuristic single-input/single-output approaches.
The idea is to introduce a supervisor loop so that when the references and/or disturbances are
sufficiently small, the control system operates linearly as designed.