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somewhat similar, there are some important mechanisms or concepts need to be carefully understood, such as number and confirmation, flow control, resend mechanism, send acceptance window.Basic model and concept of TCP/IPPhysical LayerDevice, repeater (repeater), hub (hub). For this layer, data received from one port is forwarded to all ports.Link LayerProtocol: SDLC (Synchronous Data Link Control) HDLC (High-level Data Link Control) PPP protocol inde

between end systems. Common link layer protocols include HDLC, PPP, SLIP, SDLC, etc. The wide area network technology is introduced in the packet switching mode, the user router connects to the carrier group switch through the access line. The carrier group switch network is responsible for creating point-to-point Virtual circuits (Virtual Circuit VC) on demand or permanently ). Each user router can use a physical interface to connect to multiple pee

or 1, and if the data is not encoded, then no one can understand that data is useless. The initial x., SDLC, and now popular TCP/IP network protocols all provide the underlying communication coding protocol, which solves the most basic communication problem and is capable of transmitting a string of characters from one place to another. However, it is not significant to simply transfer strings, it is very important to parse what the string represents

Iso/osi Reference Model: OSI (open System Interconnection) Open Systems Interconnect model is made up of ISO (international Organization for Standardization) a network layering model defined by the International Organization for Standardization, a total of seven layers. Detailed action of each layer: physical layer (physical layer): Physical layer defines all electronic and physical equipment specifications, for the transmission of the upper layer provides a physical medium, the unit of data tra

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ISO's Open Internet model (OSI)The OSI (open System Interconnection) Open Systems Interconnect model is a network tiering model defined by ISO (International Organization for Standardization), a total Seven layers .1. Physical layers (physical layer) : The physical layer defines the specifications for all electronic and physical devices, providing a physical medium for the transfer of the upper layer, with bits (bit) in the data Transfer unit. The specifications belonging to the definition of t

. There are also many problems with automating documentation and integrating them into the software development life cycle (SDLC): As the project progresses, these documents are often updated less or completely obsolete. A large number of documents is a negative (using improper means to solve the problem); Each team should find a balance between richness and simplicity.Document Code "No Separation"Ideally, the organization should maintain and compose

OSI (open System Interconnection), open Systems Interconnect Reference Model. From bottom to top seven-tier model features and their representative protocols: Physical Layer (physical) : Specifies the mechanical, electrical, functional, and process characteristics that activate, maintain, and close communication endpoints. This layer provides a physical medium for the upper level protocol to transmit data. bit, bit. Typical protocol representatives: eia/tia-232, eia/tia-499, v.35, v.24, RJ45

In the OSI Reference Model, from bottom to top, each layer accomplishes different, targeted functions. 1. Physical layer (physical layers)The physical layer specifies the mechanical, electrical, functional, and process characteristics that activate, maintain, and close communication endpoints. This layer provides a physical medium for the upper level protocol to transmit data. in this layer, the unit of data is called the bit (bit). Typical canonical representatives belonging to the physical lay

to ensure the proper protocol is used, the router must be configured with the appropriate layer 2nd encapsulation.The choice of the protocol needs to be determined based on the WAN technology and communication equipment used. The router encapsulates the packet in two-layer frame format and then transmits it to the WAN link. Although there are several different WAN packages, most have the same principle. This is because most WAN packages evolve from high-level Data link Control (HDLC) and synchro

The CRC is based on a checksum of modulo 2 operations.N=k+r.n is the length of the CRC code, K is the number of bits of the information code, and R is the number of bits of the checksum code.2 R-Square >=k+r+1 (correct).4 Useful information (1100) as a cyclic encoding, choose to generate a polynomial g (X) = 1011.1. Move the information bit to the left r bit, i.e. add R 0 after the information bit.Get 1100000.2. Use 1100000 pairs of G (X) for modulo 2 to divide.Get the remainder 010.3. Modulo 2

data link layer is frame ). The specifications defined in this layer include SDLC, HDLC, PPP, STP, and Frame Relay. actually used devices, such as switch switches, belong to this layer. Q Network layer: the network layer is responsible for routing, grouping, and restructuring data between subnets. The unit of data transmission in this layer is packet ). Specifications defined at this layer include IP, IPX, RIP, OSPF, ICMP, and IGMP. In actual use, de

) directly in NativeScript projects, plus hundreds of NativeScript specific INS on npm.5. CloudRail CloudRail is an API library for Android, Java, and iOS that lets you integrate multiple services with just one API. it's completely free for both personal and other cial projects. cloudRail is behind integrations in apps used by millions of people every day. join CloudRail and take your API integrations to the next level.6. Kony The Kony Mobility Platform is an open and standards-based, integrated

-transmission. At this layer, the unit of data is frame ). Data link layer protocols include SDLC, HDLc, PPP, STP, and frame relay. Main functions of the Link Layer: The link layer provides the data transmission service for the network layer, which relies on the features of this layer. The link layer should have the following functions: Establish, remove, and separate link connections. Frame demarcation and frame synchronization. The data transmission

Viktor grebenyuk is a quality assurance expert and testing manager with over eight years of experience in testing complex (mainly in the financial sector) systems and applications. His rich experience allows him to compare different test tools and methods, highlight their advantages and disadvantages, and strive to find the correct method that best suits each specific case. Natalya serdyuchenko has been engaged in software development and testing since 2004. She has worked with clie

Viktor grebenyuk is a quality assurance expert and testing manager with over eight years of experience in testing complex (mainly in the financial sector) systems and applications. His rich experience allows him to compare different test tools and methods, highlight their advantages and disadvantages, and strive to find the correct method that best suits each specific case. Natalya serdyuchenko has been engaged in software development and testing since 2004. She has worked with clie

of team members so that they can understand what you will consider. Incentive team One of the more important skills that a project manager should possess is to motivate its employees, to appreciate and praise those who have achieved their goals, and to achieve the most effective incentive effect. People want to feel their importance. If employees know that they will be appreciated in front of their colleagues, they are generally willing to spend time to complete the task. Adhere to standard met

1. Install JDK This is an important step in JSP development and a prerequisite for installing the JSP Engine (Tomcat, Resin, Weblogic, etc,Generally, JSP engines are compiled in Java. My JDK version is 1.6.0 and the platform is Windows. You can download the installation file from the website of Sun.Https://sdlc3e.sun.com/ECom/EComActionServlet/DownloadPage :~ : Com. sun.Sunit. sdlc. content. DownloadPageInfo; jsessionid = 033BE12AFE722B242F5AADE12a%4

1.Software lifecycle(SDLC)Six stages 1. Problem definition and planningThis stage is a joint discussion between the software developer and the demand side, mainly determining the software development goal and its feasibility. 2. Requirement AnalysisWhen software development is determined to be feasible, detailed analysis of each function required by the software is performed. The demand analysis stage is a very important stage. Doing well at this st