pdu osi

In the last course, we introduced the concept of subnet and the division of subnets. Now let's talk about the OSI (Open System Interconnection) Reference Model. Network Protocol Stack is of great significance. However, it doesn't matter to the level you should first learn. Many so-called network courses begin by teaching you to remember the names of each layer in the OSI model and each protocol contained in

In the last course, we introduced the concept of subnet and the division of subnets. Now let's talk about the OSI (Open System Interconnection) Reference Model. Network Protocol Stack is of great significance. However, it doesn't matter to the level you should first learn. Many so-called network courses begin by teaching you to remember the names of each layer in the OSI model and each protocol contained in

( 1) OSI seven-layer modelLayer function in OSI TCP/IP protocol family Application layer file transfer, e-mail, file service, virtual Terminal tftp,http,snmp,ftp,smtp,dns,telnet presentation layer data format, code conversion, data encryption no protocol session layer Release or establish contact with other Contacts No protocol Transport layer provides end-to-end interface TCP,UDP Network layer for packet s

Detailed explanation of each layer of the ISO/OSI model ISO layer 7 model from bottom to top is layer 1 to layer 7, respectively: www.2cto.com Application layer Presentation layer Session layer) the Transport layer (Transport layer) Network layer (Data link layer) Physical layer (Physical layer) where the upper layer is called a high-level layer, defining communications and man-machine interfaces between applications. What does it mean? The upper laye

The OSI Layer-7 model is complex due to the entire network connection process, including the interconnection between hardware, software data packets, and applications. If you want to write a program that concatenates all functions of the Internet, you must rewrite the entire program when a problem occurs in a small link. Therefore, we divide the entire network into several layers, each of which has its own independent functions, and each layer of code

Tags: blog HTTP Io OS ar use for SP File The text below is all from the Internet. OSI is layer-7 and TCP is layer-4. As follows: OSI: from Wikipedia http://zh.wikipedia.org/wiki/OSI%E6%A8%A1%E5%9E%8B. Application Layer) The application layer can communicate with the application interface to display the information to users. Common protocols include

OSI seven-layer modelApplication Layer: User interfacePresentation layer: Data representation, security, compression.Session Layer: Establish, manage, abort sessionTransport layer: reliable and unreliable transmission, error detection before transmission, flow controlNetwork layer: Logical address addressing for routing between different networksData Link layer: Group frame, hardware address addressing, error validation functionPhysical layer: Transmi

Ha, finally to the network knowledge article. Always do not know how to write this blog, because the knowledge point is too much, the content is really not good to write Ah! But, after all, as an IT staff, do not learn network knowledge how to go out? So, to the next, before the explanation, I first come to the concept of science, what is the OSI seven layer model?The so-called seven-layer model is actually nonexistent and is an imaginary network mode

letters (these letters are occasionally eaten by dogs at home ). In this way, Susan and Harvey provide a set of services different from Ann and Bill (that is, the service model is different ). For example, just as a computer network can accept different transport layer protocols, each protocol provides different service models for applications. The services provided by Ann and Bill are obviously limited by the services provided by the postal service. For example, if the postal service does not

OSI 7-layer models corresponding to each layer of the OSI model OSI reference model data encapsulation process OSI reference model VS TCP/IP Reference Model TCP/IP layer corresponding to each layer of the protocol TCP/IP Layer the corresponding TCP/IP protocol is applied to the Application layer of hardware devices at

host scan discovery via OSI two layer (data link layer)OSI The second layer of the model is the data link layer, where the protocol that works primarily is ARP. When communication occurs between two hosts, the source master first uses the ARP protocol broadcast request to obtain the destination host's MAC address. If the source host receives a response from the destination host, the target host is active, o

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

-famous science and nature, they realized the complexity of the network. Through the use of text reading, image viewing, video playback, download transmission, games, chat and other software tools from text, pictures, sound, video and other aspects to bring people a very rich life and good enjoyment. Network Purpose:What is the purpose of network transmission? That's right: data transfer because of the complexity of the network and a variety of application hardwa

The OSI Layer-7 model enables reliable communication between different networks of different systems through seven hierarchical structural models. Therefore, its most basic function is to help different types of hosts transmit data. The node that completes the relay function is usually called a relay system. In the OSI Layer-7 model, the relay systems at different layers have different names. The layer at

The OSI Layer-7 model enables reliable communication between different networks of different systems through seven hierarchical structural models. Therefore, its most basic function is to help different types of hosts transmit data. The node that completes the relay function is usually called a relay system. In the OSI Layer-7 model, the relay systems at different layers have different names. The layer at

The OSI Layer-7 model enables reliable communication between different networks of different systems through seven hierarchical structural models. Therefore, its most basic function is to help different types of hosts transmit data. The node that completes the relay function is usually called a relay system. In the OSI Layer-7 model, the relay systems at different layers have different names. The layer at

The OSI seven-layer model enables reliable communication between different networks of different systems through seven hierarchical structural models, so its main function is to help different types of hosts achieve data transfer.The OSI seven-layer model enables reliable communication between different networks of different systems through seven hierarchical structural models, so its main function is to he

The OSI seven-layer model enables reliable communication between different systems and different networks through seven hierarchical structural models. Therefore, its most basic function is to help different types of host implementation of data transmission.The node that is finished with the relay function is often referred to as a trunk system. In the OSI seven layer model, the relay systems at different t

The OSI Layer-7 model is easy to understand and can't be remembered many times. I read it again today and found that it is more logical and easier to remember to look at the problem from the perspective of historical deduction. This article is not necessarily rigorous and may be flawed. It mainly serves to help people with poor memory. In general, the OSI model is developed from the bottom layer to the top

"Data Collation" Cisco [OSI, IP Address, Network Segment, Subnet Mask]###concept###----------------------from20110712to201107161.networksegment{ Router;switch;bridge;} 2.lanblocks{broadcastdomain;broadcaststorm;multicast;lowbrandwidth;} 3.benefitsoftherouter{!forwardbroadcast;filtermsgsonlayer-3 ( Networklayer);} 4.benefitsoftheswitch{enhancelanperformance;supplymore Blandwidth;} 5.collisiondomain{datapacketscancollidewithoneanother Whenbeingsentonash