The OSI Model

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)). Chức năng và dịch vụ căn bản được thực hiện bởi tầng vật...

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The primary duties of the transport layer, Layer 4 of the OSI model, are to transport and regulate the flow of information from the source to the destination, reliably and accurately. End-to-end control and reliability are provided by sliding windows, sequencing numbers, and acknowledgments To understand reliability and flow control, think of someone who studies a foreign language for one year and then they visit the country where that language is used.

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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.

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Chapter summary: DHCP assigns IP addresses by using automatic, manual, or dynamic allocation; DNS resolves host and domain names into IP addresses; WINS resolves NetBIOS names into IP addresses; ping tests whether one computer running TCP/IP can communicate with another computer on the network;...and other contents.

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Communication Architecture Strategy for connecting host computers and other communicating equipment. Defines necessary elements for data communication between devices. A communication architecture, therefore, defines a standard for the communicating hosts. A programmer formats data in a manner defined by the communication architecture and passes it on to the communication software. Separating communication functions adds flexibility, for example, we do not need to modify the entire host software to include more communication devices....

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Transmission Control Protocol (TCP) TCP is a connection-oriented transport mechanism that resides at Layer 4 of the OSI model.

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Application filtering is one of the most difficult types of filtering that firewalls perform, because it requires the firewall to process the data at the application layer (Layer 7) of the OSI model

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