ports and protocols

With the development of the Internet in China, the connection between ISP service providers and Internet is also changing. On a network connection, from a single connection to the Internet via multiple telecommunications companies, in terms of routing protocols used, from the use of static routing protocols to the use of BGP (Border Gateway Protocol). How does the ISP deploy the BGP routing protocol rationa

The foundation of the network is the establishment and application of many computer network protocols. So how can we understand this concept? The following describes the overview of computer network communication protocols. Network Communication Protocol (Network Communication Protocol )) it is a set of definitions of the Information Format for communication between computers and the transfer content that c

-time multimedia transmission. RTP is an application-oriented transport layer protocol that does not provide any guarantee of Transmission reliability and traffic congestion control mechanisms. RTP is located on top of UDP (User datainprotocol. Although UDP is not as reliable as TCP and cannot guarantee the service quality of real-time services, RTCP needs to monitor data transmission and service quality in real time. However, because UDP transmission latency is lower than TCP, it can work well

How should we understand network communication protocols? Can we fully master the increasingly complex network structures? We need to rely on network communication protocols for learning and understanding. Network Communication Protocol (Network Communication Protocol )) it is a set of definitions of the Information Format for communication between computers and the transfer content that can be accepted by

analysis protocols, and configuring user-specified decoding and tracing of TCP streams. statistics--includes a menu item that displays multiple statistics windows, including a summary of capture packages, protocol hierarchy statistics, and more. help--contains reference content for secondary users. such as access to some basic Help files, a list of supported protocols, user manuals. Online access to some w

View local open ports How to disable high-risk ports 1. system reserved ports (from 0 to 1023) These ports are not allowed to be used. They all have a definite definition and correspond to some common services on the Internet. Each opened port represents a system service, for example, port 80 represents a Web service.

IPV6 has been clamoring for years, but the General Service is mainly IPV4, although many applications or Web servers have provided IPV6 access, but it is estimated that the distance is much longer. Compile nginx must compile:--with-ipv6, otherwise cannot use!! 1: Simultaneously listens to the Ipv4+ipv6 80 ports server {Listen [::]:80;}2: Monitor the Ipv4+ipv6 80 ports separately server {Listen 80;Listen

port number of the TCP/IP communication protocol to the number of the RPC program, because the client can call the RPC program. Generally, the RPC server is started by inet, so portmap must be started before inetd. Otherwise, RPC cannot be called.Iv. RPC for NFS servers NFS supports many functions, and different functions are started using different programs. Each time you start a function, some ports are enabled to transmit data. Therefore, the

Currently, the most common Trojan Horse is based on the TCP/UDP protocol for communication between the client and the server. Since the two protocols are used, it is inevitable to open the listening port on the server side (that is, the machine where the trojan is planted) to wait for the connection. For example, the monitoring port used by the famous glaciers is 7626, And the Back Orifice 2000 is 54320. So, yi qianxiao Yue appearance building Jing Oh

Small Q: a rain, a paper pad, leaning West Wind, but see right and wrong, empty looking back homeward bound, eventually not like as always.===========================================================Our commonly used e-mail protocols are SMTP,POP3,IMAP4, which are subordinate to the TCP/IP protocol family, and are established by default by TCP ports 25, 110, and 143 respectively.SMTP ( Simple Mail Transfer P

agreement, it has all the method declarations in the agreement.3. As long as the parent class adheres to a protocol, the subclass also follows.The 4.Protocol declaration method allows any class to be implemented, and Protocol is the Protocol.5.OC cannot inherit multiple classes (single inheritance) but can comply with multiple protocols. Inheritance (:), Compliance Agreement (6. The base protocol:7. The agreement is subject to the agreement, and one

Returns the media access control (MAC) address of all network adapters in the computer and the list of network protocols for each address, either from the local area or back through the network. Grammar Getmac[.exe] [/s Computer [/u domain\user [/P Password]]] [/FO {table| List| CSV}] [/NH] [v] Parameters /s Computer Specifies the remote computer name or IP address (you cannot use a backslash). The default value is the local computer. /u domain\user

allows you to create globally unique identifiers for resources (network); Peak.storage allows you to manage databases and persistent content, as the name suggests. However, for this article, we will focus on the PEAK.API. Especially the Pyprotocols package, which can be obtained separately and provide an infrastructure for other PEAK. A version of the Pyprotocols package is included in the Peak.api.protocols. But now what I'm interested in is studying a separate

Internet Protocol IP and its supporting protocols @ (computer network) IP protocol is one of the two most important protocols in TCP/IP protocol cluster. The protocol is as follows: Address Resolution Protocol –arp Inverse address resolution –RARP Internet Control Message Protocol –ICMP Inter-Group Management Protocol –IGMP where ARP and RARP support IP protocol operations, ICMP and IGMP operations require

be performed between IP addresses with the same network number. To communicate with hosts with other IP address subnets, the communication must go through a vro or gateway on the same network. IP addresses of different network numbers cannot communicate directly, even if they are connected together. A vro has multiple ports used to connect multiple IP subnets. The network number of the IP address of each port must be the same as the network number of

The previous article analyzed the overall concept of the Internet, from bottom to bottom, and the design philosophy of each layer of protocol.This is a question from the designer's perspective. Today I want to switch to the user's perspective to see how users interact with these protocols from top to bottom. ========================================================== ================================= Getting started with Internet

Internet protocols are the foundation of our network usage and development. So the understanding of this protocol is particularly important. Now we will parse some of the content of this Protocol, including its addressing, segmentation, and gateway knowledge. The addressing method is also the address method we currently use in the IPv4 protocol. With the continuous development of the network, we will replace the current IPv4 with the IPv6 protocol, an

File transfer The examples used in the previous two articles are transmission strings, and sometimes we might want to pass files between the server and the client. For example, consider a situation where the client displays a menu that sends files client01.jpg, client02.jpg, client03.jpg to the server when we enter S1, S2, or S3 (s for send); When we enter R1, When R2 or R3 (R is the receive abbreviation), the file server01.jpg, Server02.jpg, Server03.jpg are received from the server side, resp

First, Web applications　　A Web application is an application that can be accessed through the web;The biggest benefit of the program is that the user has easy access to the application, and the user needs only a browser and no additional software to install.There are two modes of application: C/S,/b.1, c/S is a client/server-side program, which means that such programs generally run independently.2, b/S is browser-side/server-side applications, such applications generally with the help of Google

The HTTP protocol defines eight methods or "actions" to indicate different ways to manipulate the resources specified by the Request-uri.The details are as follows:OPTIONS: Returns the HTTP request method that the server supports for a specific resource. You can also test the functionality of your server with a request to send a ' * ' to the Web server.HEAD: Ask the server for a response that is consistent with the GET request, except that the response body will not be returned. This method allo