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Table 1-1 is the TCP/IP four-layer model and the OSI seven-layer model table. We correspond the OSI seven-layer network model with the Linux TCP/IP four-layer conceptual model, and then categorize the various network protocols. Table 1-1 TCP/IP four-layer model and OSI seve

Reasons for the existence of the OSI model (open System interconnection):The network model is built so that the builders of the network can build networks that can communicate and work with each other, and describe the transmission of data from one computer to another on a network.1.physical LayerDefines the electronic and functional aspects of the connection between the end systems, including voltage level

What is the difference between the actor model of Akka/erlang and the goroutine of the Go language and the CSP (communicating sequential Processes) model represented by channel channels?First of all, both are solutions to the concurrency model, and let's look at how it's defined and implemented:The actor model describe

PolyA urn modelfrom Wikipedia, the free encyclopedia In statistics,PolyA Urn Model(Also known asPolyA urn SchemeOr simplyPó Lya's urn), Named after George P ólya, is a type of statistical model used as an idealized mental exercise to understand the nature of certain statistical distributions. In an urn model, objects of real interest (such as atoms, people, cars,

Css knowledge (7)-box model and css knowledge Box Model1. Introduction Starting from this section, we will go to the third part of this series-css rendering. This section describes the layout and rendering features of css on the page. There are two types: Text and block. The first type is text. This part is relatively simple, such as font size, Font, color, background color, and whether to bold. The key point is to set the font, set the line height, a

HSV (hue, saturation, value) is a color space created by a.r. Smith in 1978, also known as the hexcone model ). The color parameters in this model are: tone (H), saturation (s), and brightness (V ). HSV Color Space Model[1]Tone H: used for angle measurement. value range: 0 ° ~ 360 °. Start from the red color and start from the counter-clockwise direction. The re

This article is licensed to be transferred from the Phphub community Using Baum nested set model to implement infinite pole classification of Laravel model Description We usually use recursion to achieve infinite pole classification, all know that recursive efficiency is very low, the following is recommended a Laravel extension package Etrepat/baum, quickly let your data

Original: thinkphp model use details--core of the Model (vii)Note: This section is the core processing part of the thinkphp framework for data manipulationWe're still looking here. You can cut and drop it in the Code Editor to viewThis section highlights the model:One, ordinary query method, two, expression query way, three, interval query, four, statistical query, five, SQL direct queryReview the prelimina

TCP/IP four layer modelTCP/IP is synonymous with a set of protocols, and it also includes many protocols that make up the TCP/IP protocol cluster. TCP/IP protocol cluster is divided into four layers, IP is located in the second layer of the Protocol cluster (corresponding to the third layer of OSI), TCP is located in the third layer of the Protocol cluster (corresponding to the fourth layer of OSI).Application layer: Transport Layer Interconnect Network Layer network Interface Layer : the manage

1) OSI seven-layer model and TCP/IP four-layer modelOSI layer Seven model: a standard system developed by the International Organization for Standardization (ISO) for interconnection between computers or communication systems. It is a seven-layer, abstract model that includes not only a series of abstract terms or concepts, but also specific protocols.TCP/IP four

Bo is engaged in a FPGA, has not really studied Ethernet-related technology, and now finally can calm down the heart to learn, I hope that they can more in-depth grasp the most basic communication interface technology. Here's the start.I. OSI Reference ModelToday we first learn about Ethernet is the most basic and important knowledge--osi Reference model. 1, OSI source OSI (open System Interconnect), that is, open systems interconnection. Commonly ca

Incremental Model) It is also called an evolutionary model. Similar to building, software is also built step by step. In the incremental model, the software is designed, implemented, integrated, and tested as a series of incremental components. Each component is formed by a variety of interactive modules to provide specific functions.CodeSegment composition. The

layer: spdu--represents the Protocol data unitDigital representation of your data (English/Chinese/Picture/mp3 ...) Translated into 01 formats via a certain rule)EncryptionCompressionApplication Layer: apdu--Application Protocol Data UnitInterfaces to provide services to users2.TCP/IP Four-layer network modelThe above mentioned Iso/osi seven layer model is currently just a model, in the actual network tran