Programming VIP

ppp-2.4.9 source code analysis PPP agreement workflow When a user dials in to an ISP, a physical connection is established from the user's personal computer to the ISP. At this time, the user's personal computer sends a series of LCP packets (encapsulated into multiple PPP frames) to the ISP to establish the LCP connection. These packets ...

Socket programming 🐣 Because socket programming is very huge, this paper, as a learning note, only realizes the relatively simple and basic part, but I hope it will be helpful to you Links to all computer network learning notes Sockets are different when identifying communication endpoints External: use IP address + port numberIntern ...

Content security policy (CSP) is an additional security layer used to detect and weaken certain types of attacks, including cross site scripting (XSS) and packet sniffing attacks. Website maintainers use CSP to define the rules of some content sources, and then tell the browser these rules in some way. The browser determines which source ...

I Single choice questions (11 questions in total, 100.0 points) 1[2009] FTP Transfer between client and server FTP Command, the connection used is (). A,Based on TCP Control connection above B,Based on TCP Data connection on C,Based on UDP Control connection above D,Based on UDP Data connection on Correct answer: A FTP uses TCP 2[2010]If t ...

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Summary of key points Basic concepts bit, Byte, rate, bandwidth, throughput, delay, delay bandwidth area, round trip time, utilization, packet loss rate OSI seven layer model Physical layer, data link layer, network layer, transport layer, session layer, presentation layer and application layer OSI network standard model Physica ...

1, Introduction Access control list (ACL) is a list of instructions (i.e. rules) applied to the router interface. These instruction lists are used to tell the router which packets are acceptable and which packets need to be rejected. 1. Working principle ACL uses packet filtering technology to read the information in the layer 3 and laye ...

XMLDecoder deserialization vulnerability underlying The reference articles have been analyzed in great detail. Here I mainly talk about the final implementation. That is, the use of the Expression class import java.beans.Expression; public class test { public static void main(String[] args)throws Exception { Parameter();//With ...

concept First, let's understand the related concepts of HTTP proxy. Generally speaking, there are two types of HTTP proxy, one is forward proxy and the other is reverse proxy. Although they are all proxies, there are still differences. The VPN we usually use is the forward proxy. We specify a server, and then connect to the server through the ...

epoll related system calls #include <sys/epoll.h> int epoll_create(int size); epoll_create creates an epoll model and returns a file descriptor pointing to the epoll model.Parameter is deprecated and reserved for compatibility. Fill in at will.The file descriptor is returned successfully, and - 1 is returned for failure. int e ...