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Detailed description of OSI Layer-7 Model

-449 Eneoding.Example:RJ45DefinitionWires/pinsV.35, V.24 EthernetAnd802.3DefinitionWires/RJ45, Ethernet Pins1, 2, 3, 6802.3, 802.5 FDDI 4. Communication at the same layer of different computers HostAHostB ApplicationApplicationPresentationPresentationSessionSessionTransportTransportNetworkNetworkNetworkData LinkData LinkData LinkPhysicalPhysicalPhysical Router (with only three layers of Functions) V,Data encapsulationData encapsulation and data packet name Data formatOSILayer

Experience Sharing: a simple way to process PHP Strings

="W.J.Gilmore,LLC(http://www.wjgilmore.com)"; $url=preg_replace("/http://([A-z0-9./-]+)/","$0",$url); //$url="W.J.Gilmore,LLC(http://www.wjgilmore.com)" 7. Remove HTML tags from a string As a Web developer, one of the main tasks is to ensure that user input does not contain any dangerous characters. If so, this will lead to SQL injection or script attacks. PHP includes many security features that hel

Understanding network adapter-network device design expert decrypts Network Transmission

Ethernet Card. The Ethernet data link layer actually contains the MAC (Media Access Control) Sub-layer and the LLC (Logical Link Control) Sub-layer. An Ethernet Card Mac chip not only implements MAC Sub-layer and LLC sub-layer functions, but also provides a compliant PCI interface for data exchange with the host.After Mac receives an IP packet (or a packet from other network layer protocols) from the PCI b

OSI Layer-7 Model

layer through error control and traffic control methods, it provides a reliable method for data transmission through physical media.This layer is usually divided into two sub-layers: Media Traffic Control (MAC) and Logical Link Control (LLC. The main task of the MAC Sub-layer is to solve the problem of multi-users competing with the channel in the shared network, and complete the problem control of the network medium; The main task of the

Watchdog for stm32

bit encoding method (NRZ encoding, 6-Bit Insert filling bits), bit sequence (bit timing, bit sampling), and synchronization mode (Synchronization Based on the synchronization segment SS, but specifically, the electrical characteristics of the signal level, communication speed, sampling points, drivers and bus, and the form of connectors are not defined,The user shall determine it by himself;Transport Layer: Defines the re-sending control;Data link layer: The data link layer is divided into two

OSI Layer-7 Model

physical layer through error control and traffic control methods, it provides a reliable method for data transmission through physical media.This layer is usually divided into two sub-layers: Media Traffic Control (MAC) and Logical Link Control (LLC. The main task of the MAC Sub-layer is to solve the problem of multi-users competing with the channel in the shared network, and complete the problem control of the network medium; The main task of the

CAN bus Basics

CAN bus protocol: Covering the transport layer, data link layer, and physical layer defined by OSIPhysical Layer: It determines the bit encoding method (NRZ encoding, 6-Bit Insert filling bits), bit sequence (bit timing, bit sampling), and synchronization mode (Synchronization Based on the synchronization segment SS, but specifically, the electrical characteristics of the signal level, communication speed, sampling points, drivers and bus, and the form of connectors are not defined,The user sh

Network Technology Learning Note 2-data link layer

The data link layer can be divided into the LLC layer (Logical Link Layer) and MAC layer (media access layer ). The LLC layer provides high-level interfaces and controls the underlying layer (error and traffic control)Traffic control: throttling Window Flow Control (based on the returned response, the recipient's receiving capacity is determined to adjust its own rate)The MAC layer completes the channel occ

OSI Layer-7 Model

layer through error control and traffic control methods, it provides a reliable method for data transmission through physical media.This layer is usually divided into two sub-layers: Media Traffic Control (MAC) and Logical Link Control (LLC. The main task of the MAC Sub-layer is to solve the problem of multi-users competing with the channel in the shared network, and complete the problem control of the network medium; The main task of the

Network Knowledge complementing

devices: terminal hosts and routers; commonly used for DCE devices: Wan Switching Machine, moderm, CSU/DSU. EIA/TIA-232, also known as RS-232, is a public physical layer standard, used to support signal rate up to 64 Kbps of non-balanced circuit. V.24 standard: interfaces between DTE and DCE defined by ITU-T. the cable can work in both synchronous and asynchronous modes. in asynchronous mode, the link layer protocol is encapsulated to support IP addresses and IPX, while the highest transmission

How to view the version number of Eclipse or MyEclipse

For EclipseMethod One:Open the. eclipseproduct file with Notepad under the Eclipse installation path, with the Eclipse version number in it.Shaped like:Name=eclipse PlatformId=org.eclipse.platformversion=4.2.0Method Two:Open Eclipse:help-->about EclipseA row of different versions of Eclipse logo is displayed below the pop-up box, and you can click on the Eclipse logo you are using (when hovering, you will be prompted "eclipse.org") to display your Eclipse version (Eclipse Platform), as follows:E

WiFi Drive Development under Linux (i)--wifi basic knowledge analysis

and wired networks. A wireless access point is usually composed of a wireless outlet and a wired network interface (802.3 interface), bridging software conforms to the 802.1D bridging protocol. An access point is like a wireless base station in a wireless network that aggregates multiple wireless access points into a wired network. A wireless terminal can be a 802.11PCMCIA card, a PCI interface, an Isa interface, or an embedded device (such as a 802.11 mobile phone) on a non-computer terminal.T

The difference between ADSL bridging mode and router mode

broadband router, which is dialed by the built-in PPPoE dial tool for the broadband router. If in a multi-user environment, the number of clients, such as: Internet cafes, enterprises, communities, often ADSL ROUTER plus broadband router network form, when most of the ADSL ROUTER work in bridge mode, by the broadband router to dial function, and assume the route of the work, This is because ADSL router has a low routing capability and can degrade or cause a panic failure when handling a large

Python Normalization LinkedIn User's contact company suffix (data normalization)

CODE:#!/usr/bin/python #-*-Coding:utf-8-*-"Created on 2014-8-19@author:guaguastd@name:company_suffix_normalize.py" # import Jsonimport Osimport csvfrom collections Import counterfrom operator import itemgetterfrom prettytable import Pret tytable# Specify CSV directorycsv_file = Os.path.join (r "E:", "\ \", "Eclipse", "LinkedIn", "Dfile", "My_connections.csv") # define a set of transforms that converts the first item# to the second itemtransforms = [(', Inc ', '), (', Inc ', '), (',

10 simple ways to handle PHP strings _php tips

Preg_replace () function, which searches for a string according to the regular expression and defines the structure of the URL: Copy Code code as follows: $url = "W.J Gilmore, LLC (http://www.wjgilmore.com)"; $url = Preg_replace ("/http://([a-z0-9./-]+)/", "$", $url); $url = "W.J Gilmore, LLC (http://www.wjgilmore.com)" 7. Remove HTML tags from a string As a web developer, on

The relationship between GPRS and TBF

user reservation, but the user can not get the best bandwidth. This is also in the GPRS network optimization needs to pay close attention. GPRS system wireless resources refers to the PDCH,PDCH is all GPRS attached mobile phone sharing and dynamic distribution in the community, in the form of TBF (temporary Block Flow) to divide, on demand, when the data (specifically, rlc/ Mac block) needs to be transferred when the TBF is assigned, TBF will be released after the transmission is complete. TBF

Compare the OSI seven layer model and the TCP/IP four layer model

is transmitted, and the circuit seems to be invisible to the transmitted bit stream. Data Link LayerThe data link layer, the second layer of the OSI model, is responsible for establishing and managing links between nodes. The main function of this layer is: through various control protocols, the error-prone physical channel becomes error-free and can reliably transmit data frame data link.The physical link is unreliable in the computer network due to the existence of various disturbances. There

Linux must be the principle of input URL to see the page content principle

media and content-length request length of both. Below the request header is a "blank line", where you can send a carriage return or newline to tell the blank line that there is no content for the request header. Below the empty line is the request body, if the Get method is not the request principal here. The request packets to this HTTP contain these things, and then go through the OSI seven layer model to start the data encapsulation for this request header> Packet Encapsulationthe request p

Linux operation and maintenance of the road network basic Learning 1.3

Tags: dahne linux cloud Computing operation and Maintenance networkNetwork Fundamentals 1.3Data Link Layer parsing:Data Link Layer:is located between the physical layer and the network layer;Features of the data link layer:--Establishment, maintenance, demolition of data link--frame wrapping, frame transfer, frame synchronization--Error recovery of frames--Flow control--------------------------------------------------------------------------------------------------------------- ---Ethernet:What

Linux entry must-read articles

?name=Newsfile=articleop=viewsid=39 let "Cat" Run on Linux (LLC stickers, It should be good. )http://www.linuxfans.org/nuke/modules.php?name=Newsfile=articleop=viewsid=443/HTTP www.linuxfans.org/nuke/modules.php?name=Newsfile=articleop=viewsid=444 5, the mouse wheel can not be used?http://www.linuxfans.org/nuke/modules.php?name=Forumsfile=viewtopict=3098Four, the Linux interface Han: Linux interface Why so ugly ah? Why is the font so ugly?Nothing like

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