osi layers

1100: [POI2007] symmetry OSI time limit:10 Sec Memory limit:162 MBsubmit:630 solved:243[Submit] [Status] [Discuss] DescriptionThe FGD children--a young mathematician famous--has a small mm,yours. FGD children like his mm very much, so he is very happyHelp his mm to do maths homework. But, like all scientific containers, the FGD brain refuses to keep repeating the same questions. Unfortunately,Yes, yours was a very hardworking student, so she

OSI is an abbreviation for open System interconnection, meaning open Systems interconnection, the International Organization for Standardization (Iso,international Organization for Standardization) developed the OSI model, The model defines the standards of interconnection of different computers and is the basic framework for designing and describing computer network communication.① Physical layer: to give

First, the actual application of the network classificationBlock data streams: FTP, TFTP, inventory updateNo direct human interaction requiredBandwidth is important, but not a critical factorInteractive Data Flow: Inventory queries, database updatesInteractiveResponse timeFacts app Data flow: VoIP videoPeople-to-people interactionEnd-to-end latency is criticalSecond, network topology classification650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/74/A5/wKioL1YlnlziS4lHAACtxQp5eLI606.jpg

Friends who are interested in network programming may have heard of the OSI seven layer model, and the next one is a diagram of the entire protocol implemented under Windows. Implementation structure of the OSI seven layer model under Windows +-------------------------------+ | Ws2_32.dll | +-------------------------------+ usermode | | +

OSI seven-layer model Application LayerPresentation LayerSession LayerTransport Layer Core LayerNetwork Layer aggregation LayerData Link Layer Access layerPhysical LayerFirst, the physical layer1. Transmission unit: bit bitstream2. Device NIC, Hub hub, transfer mediaProfessional Terminology broadcast: A pair of all multicast: one to many Unicast: One to all full duplex: Receive and send simultaneouslyHalf Duplex: Receive and send two select oneBroa

Tag:httpioosarsp Data divon code The Http://baike.baidu.com/view/69334.htmMAC (Media Access Control) address, or MAC location, is used to define the locations of network devices. In the OSI model, the third layer of the network layer is responsible for the NBSP;IP address, while the second layer of data link is responsible for MAC addresses. Therefore, a host will have an IP address, and each network location will have a Mac addressing that is exclus

Layer function in OSI TCP/IP protocol familyApplication layer File transfer, e-mail, file service, virtual terminal tftp,http,snmp,ftp,smtp,dns,telnetpresentation layer data formatting, code conversion, data encryption no protocolsession layer lifted or established contact with other Contacts no protocolThe transport layer provides an end-to-end interface to the TCP,UDP network layer for packet selection routing IP,ICMP,RIP,OSPF,BGP,IGMP the data link

Layer description The application layer provides the corresponding interface for users to use the network connection function.The presentation layer completes data formattingThe Session Layer controls the communication links between two hosts (open, operate, and close)The transport layer provides data transmission services (reliable or unreliable)The network layer provides a addressing/addressing mechanism between two hosts and is responsible for packet routing.The data link layer controls the

Chapter 2 OSI reference model and TCP/IP model (continued)3. TCP/IP model 3.1 the hierarchical network layer of TCP/IP is a key part of the TCP/IP system. Its main function is to enable the host to send information to any network and send it to the correct target. The network layer uses IP addresses to identify network nodes. The routing protocol is used to generate route information, and packet forwarding is implemented based on the routing informati

First, the physical layer1. Responsible for the transmission of the bit stream between the equipment, physical interface, electrical characteristics and so on.It's not, it's only 1, 3, 2, 64 lines for transmitting data, the rest of the line doesn't matter,Similar functions are controlled by the physical layer.2. Most common devices in the physical layerSecond, Data link layer1. The main function of data link layer is to encapsulate frame, access media with MAC address, error detection and correc

"%d",TT); + while(tt--) - { + intN; Ascanf"%d",n); at for(intI=0; ii) -{scanf ("%d%d",e[i].x,e[i].y);} - for(intI=0; i1|1]=dis (i, (i+1)%n); - for(intI=0; i1]=cro (i, (i)1+n)%n, (i+1)%n); - intall=n1; for(intI=0; iS[i]; -all1; in intans=0, mx=0, id=0; Memset (R,0,sizeofR); - for(intI=0; ii) to { + if(mx>i) R[i]=min (mx-i,r[2*id-i]);Elser[i]=1; - while(i-r[i]>=0i+r[i]; the if(I+R[I]GT

　　　　　　　　　　　Network programmingNetwork model: OSI (Open System Interconnection Open System interconnect) Reference Model TCP/IP Reference Model Seven Floor Brief:1. Layer Physical layer: The main definition of physical equipment standards, such as the interface type of network cable, the interface type of optical fiber, the transmission rate of various transmission media.its main role is to transmit the bitstream (that is, 1, 0 is con

The PC connects switch A, which makes up the intranet. The DNS Serv and the Web Serv connection Switch B make up the extranet.Intranet communication PC1 to PC2:The PC1 sends the data first to switch a, and switch A does not have the ARP address cache table for broadcast.When the data is dropped to the router, the PC2 response returns its MAC address information to PC2, and switch a ARP caches the response PC1.The PC1 gets a response and then sends the real data, and switch A sends data to the PC

takes 0 and a positive integer)2.2 Root port of the non-root switch is elected.1. Select a small cost (the larger the bandwidth, the smaller the overhead), the closer the root switch is.2. Neighbor Bridge ID is small.3. Port ID (port number) (upstream ports) Select a small2.3 Designated Port of the electoral segment0. This network segment refers to the data link segment, such as the connection between switch B and C is the network segment.1. Select a small cost (the larger the bandwidth, the sm

1.UDP protocolUDP is a connectionless transport layer protocol in the OSI Reference Model, which is mainly used for transport that does not require packet order arrival, and the packet transmission sequence is completed by the application layer [2], providing a simple and unreliable information delivery service for transactions. The UDP protocol is basically the interface between IP protocol and upper layer protocol. The UDP protocol applies to multip

Topic: Given a polygon, the number of axes of symmetryI x this is how to think KMP ...The Edge word Fu Hua is then found in the center of the polygon and represented by the edge-angle-edge of the triangle with the center.Sweep the side clockwise over and then multiply to the length of 2n-1 and then counterclockwise sweep again, the number of times that appear in the clockwise that is the number of axesWith the KMP algorithm, you can prove yourself yy.The accuracy of human card ...#include Bzoj 1

OSI Virtual machine model "Virtual" is to hint at a certain time, although an object or device does not exist, but people can see it The word "virtual machine" is easy for many people to have a rich association. The word "virtual" is often used in popular media and news broadcasts when reporting on new developments in computer simulations and computer games. In either case, the use of "virtual" is suggestive of a certain time, although an object

the receiving side must send back the acknowledgement, and if the packet is lost, it must be resent.Network layer:Responsible for communication between neighboring computers. Its functions include three aspects.First, processing packets from the transport layer to send the request, after receiving the request, will be grouped into the IP datagram, populate the header, select the path to the host, and then send the datagram to the appropriate network interface.Second, the processing of input dat

Layers of network equipment: network devices have repeaters, bridges, routers, gateways, and so on. Repeater (Repeater) repeater is the simplest device for LAN interconnection, which works at the physical layer of the OSI architecture, receives and recognizes network signals, and then regenerates the signals and sends them to other branches of the network. The Network Bridge (Birdge) bridge works in the dat

Iso/osi the PDU (Protocol Data unit) corresponding to the TCP/IP protocol model of the Reference ModelThe application layer ..... ..... The application layer ...... DataThe presentation layer ..... ..... The application layer ...... DataThe session layer ..... ..... The application layer ...... Data The transport layer ..... ..... The transport layer ...... Paragraph The network layer ..... ..... The Internet layer ... Package Data link layer .....