Programmer Think

OSI network seven layer model: (Open System Interconnection), translated as "Open System Interconnection" Physical layer, data link layer, network layer, transport layer, session layer, presentation layer and application layer TCP/IP simplifies OSI, merges some layers, and finally retains only four layers, including interface layer, ...

Since my work mainly focuses on the network subsystem of the kernel, I just came into contact with this module, so I want to sort out the packet receiving process driven by the network card. The following contents are my personal understanding. If there is anything wrong, I hope you can make more corrections and grow up with each other~ In the ...

Section I overview of network communication 1.1 software structure Network programming is a program that realizes the communication between two computers under a certain protocol C/S structure: the full name is Client/Server structure, which refers to client and server structure. Common programs include QQ... And other software B/S struct ...

Server communication process Server: 1,adopt socket()Function to create a to receive a connection request socket 2,To construct the host connection address sockaddr_in structural morphology,include sin_family,sin_port,sin_addr Three members 3,binding sockaddr_in Structure and socket 4,adopt listen()Function will stocket Set to listenin ...

*1, There are two main problems in network programming: * 1. How to accurately locate one or multi state host (IP) on the network; Locate the specific application (port number) on the host * 2. How to carry out network transmission reliably and efficiently after finding the host * *2, Two elements in network programming: * 1. Corresponding que ...

It's time for bloggers to finish setting up. Because the data sets required by bloggers in the direction of setting up are rarely publicly provided (after all, DNS records have some privacy problems), they have to simulate DNS attacks to operate by themselves. First of all, if you want to know what is DNS tunnel attack, you can take a look at o ...

Recently, a project requirement is as follows: the software side will send a request to the server to obtain some information. Then process the acquired information and return the id of the information Method 1: the software side calls the interface and requests once a minute. The problem: if tens of thousands of people use the software at th ...

catalogue Network connectivity detectionCheck socket connectionNetwork usage detectionNetwork packet capturetransfer filesConnection idle timesummary Network connectivity detection In case of network abnormality in the application, the first thing to confirm is whether the network connectivity is normal. The following group of commands can ...

catalogue preface Test requirements: Network topology idea: Experimental analysis: 1. Erunk configuration between SW1 and SW2 2. Create VLANs, divide VLANs and trunk roads 3. Configure STP 4. Configure SVI  5. Configure VRRP 6. Configure DHCP 7. Configure the ip address of R1, R2 and SW1 uplink 8. Configure OSPF routing 9. Con ...

Python - implement file downloader Supplementary knowledge points tcp servers generally need to be bound, otherwise the client cannot find the servertcp clients are generally not bound, because they send out the linked server, so as long as the ip, port and other information of the server is determined, the local client can be randomly connec ...