hdlc protocol

What is the working principle of HTTP? How to optimize the HTTP protocol ?, Protocol Working Principle Optimization made by http1.0 Bandwidth: latency has been solved at this stage: 1. browser blocking: the browser can only connect to the same domain name with four connections at the same time. latency: 2. DNS query: The Browser needs to know the IP address of the target server to establish a connection del

Send the monkeys to the reinforcements.An RFC document on ICMP here!What the hell?In my opinion, the ICMP protocol is mainly to pass/query some basic information to each other, most of which is to pass some error message.For example, a sends the UDP message to B's 10000 port, but B's 10000 port does not open, it will return an ICMP packet to a, tell the A10000 port is not open.Basic query information, such as the most commonly used ping command, is to

OverviewBoth TCP and UDP use the same network-layer IP, but unlike UDP, TCP is a connection-oriented, reliable byte-stream protocol. Therefore, both parties must establish a TCP connection before transmitting the data. TCP realizes the transmission of reliability through the mechanism of verification, serial number, acknowledgment response, retransmission mechanism, Connection management and window control.TCP provides reliability in the following way

To put it simply, the svn + SSH (SVN over SSH) protocol works by establishing an SSH connection between the svn client and the server, and then pushing commands and transmitting data through the SSH connection, to achieve more secure SVN communication through SSH. Using SVN + SSH to access repository is the biggest difference from common HTTP or HTTPS methods, or the only difference is to log on to the remote host through SSH Security Authentication T

Msnp9 Protocol Analysis Report 1. Connection The MSN Messenger protocol is built on TCP/IP. In addition to direct "point-to-point" communication between file transmission and voice chat, all other scenarios are performed through the server. Logically, there are three types of servers with their respective roles: Dispatch server (DS)-the server on which the client first connects. Allocates appropriate notif

DHCP protocol Introduction DHCP, full name: Dynamic Host Configuration Protocol, Chinese name: Dynamic Host Configuration Protocol, its predecessor is BOOTP, it works at the OSI application layer, it is a proprietary protocol that helps computers obtain their configuration information from a specified DHCP server.DHCP

USB protocol analysis, usb protocol 1. Description structure of USB devices 1. Logical Organizational Structure The logical organization of a USB device consists of four layers: device, configuration, interface, and endpoint. A device usually has one or more configurations. The configuration usually has one or more interfaces with zero or multiple endpoints. Each USB device can contain one or more configur

This paper will take SC water meter as an example to continue to explain the cj/t-188 Water Meter Protocol of the switching valve protocol analysis process, the following data without special description, all refer to hexadecimal. Open valve: Data transmission: FE fe fe fe-A0 17 01 55 50 16 The description is as follows: Fe fe FE: Protocol head (1-4 groups). 68:

HTTP protocol Learning Focus: The basic concept of HTTP protocol, request response model, the different methods of submitting requests, response status judgment, get response and resolution response, data download implementation method, data upload implementation method, request header details, response header details and so on the HTTP protocol learning, Recomme

reader has a general understanding of the simple call process of the SIP protocol, and will use ethereal and other packet capture tools to analyze the SIP Message structure, have a good understanding of the concepts of C pointers, linked lists, memory control, and state machines .) To apply Osip to our program, we should first look at the official documentation, which gives a detailed description of how to use the various functional components provid

For object-c @ protocol, object-c @ protocol Understanding from the java perspective @ Protocol is equivalent to java interface definition, and the usage is the same The following is an example of a test. @protocol mytestClass Protocol is defined here and DiscoveryControl

Recently, nodejs has been used to implement a resumed upload protocol for Tus, with several intermittent changes in the middle.CodeAddress: https://github.com/maddemon/tus-demoIt's just a demo, so the code is not complete, such as exception capture or something, but I just want to implement the core code. After all, it is not a real project development. Tus Protocol address.This is an HTTP-based resumable

What is HTTP? Simply put, it is a communication specification based on the application layer: both parties need to communicate, and everyone must abide by this specification, which is the HTTP protocol. What can the HTTP protocol do? Most people will first think of: browsing the Web page. Yes, Web browsing is the main application of HTTP, but it does not mean that HTTP can only be used for Web browsin

Socket is used when learning Java, but I still don't understand what is going on. There is no foundation for computer networks. I found some information everywhere. A rough summary of the useful information is provided to facilitate a deeper understanding in the future. For more information, see. I. Differences between the Tup protocol and the UDP protocol TCP-the transmission control

Layer-7 network division In 1978, the International Organization for Standardization (ISO) proposed the "Open System Interconnection Reference Model", the famous OSI/RM model (Open System Interconnection/Reference Model ). It divides the communication protocol of the computer network architecture into seven layers:Layer 7: Application LayerLayer 6: Presentation LayerLayer 5: Session LayerLayer 4: Transport LayerLayer 3: Network LayerLayer 2: Data Lin

//: Playground-noun:a Place where people can playImport UIKit//protocol---in the--swift standard library////1. Example comparison: Determine whether two instance values are the sameLet A =4, B =4a= = B//(comparison of type int)//custom struct type, compare for equalitystructGames {var wincount:int var losecount:int}let G1= Games (Wincount:2, Losecount:1) Let G2= Games (Wincount:2, Losecount:1)//G1 = = G2//custom types Determine whether equality is req

ObjectiveWhen the Mqtt protocol was born, it was never considered for transmission over HTTP. This is also normal, network constrained, unstable network is not suitable for HTTP (2g/3g network everyone using WAP is not OK). On the desktop side of the network more abundant, although the pure text contrast binary is not much advantage, subject to historical legacy and usage habits, as well as a large number of traditional infrastructure to facilitate co

WSGI protocol and its impact on the server, wsgi protocol server The following content is my personal learning experience. If you have any questions about my point of view, please leave a message and I will learn from Daniel modestly. The full name of WSGI is web service gateway interface. WSGI is a protocol specification that describes the communication between

"TCP/IP Detailed Volume 1: Protocol" chapter 6th icmp:internet Control Message Protocol---reading notes1. IntroductionICMP is considered to be an integral part of the IP layer, which transmits error messages and other information that needs attention. ICMP packets are typically used by the IP layer or higher-level protocols (TCP or UDP). Some ICMP packets return the error message to the user process.The ICM

(8/18) re-learn Standford_iOS7 development _ protocol, block, animation _ course notes, ios7 Layer Protocol Lesson 8: 1. Agreement Another method of Security Processing id type is: id A. Statement // Protocols are generally stored in. in the H file or in the class. in the hfile @ protocol Foo B. Implement the protocol