How can we understand the meaning of our so-called communication protocol? Who defined this standard? We will discuss this topic briefly. Communication Protocol-one of the earliest protocols in the Open System Interconnection protocol, which provides communication support for interconnected networks connected to differ
When we use the Internet, we often say that the IP address is Internet Protocol. Internet protocol. In order to better understand this knowledge, we have summarized and sorted out the basic content. Now let's take a look at the specific meaning of the IP protocol.
Internet Protocol
) to any network, and to make the datagram independent of the target, for the IP datagram assigned a full network unique delivery address (called IP address), to achieve IP address recognition and management. The transport layer provides an end-to-end communication function for the application, similar to the transport layer in OSI/RM. This layer protocol handles the communication problem that the IP layer does not handle, guarantees the reliabi
The Chinese meaning of SNMP protocol is Simple Network Management Protocol. So where did this Protocol help administrators manage their networks? Today, we will briefly introduce the origin of this Protocol and the role of relevant commands.
The SNMP
HTTP protocol common standard status code meaning
Status Code
meaning
Notes
200
The request is complete
2XX status codes are returned as normal status codes.
300
Multiple options
The server can perform a variety of actions depending on the request. The server c
corresponding ports on the queue is full of two casesThe somaxconn of the system can be modified in the following wayVim/etc/sysctl.confNet.core.somaxconn = 2048Sysctl-pIn PHP-FPM, there is an option for thisListen.backlog =-1This value, preferably not set to-1, 1 when the system is not able to set the number of settings, resulting in 502 appears2015/02/11 12:37:22 [ERROR] 25725#0: *1015645 connect () to Unix:/tmp/php-cgi.sock failed (11:resource temporarily unavail able) while connecting to up
UDP is at the top layer of the IP protocol, which should be clear to everyone. Therefore, the complex protocol structure of the network constructs all aspects of the network. Today we will introduce the basic content of the UDP protocol. The UDP Protocol is short for the User data
Our internet is compliant with certain protocol specifications so that normal work and information exchange can be conducted in an orderly manner. Now we have started to use the IPv6 protocol. However, many of our friends are not very familiar with this. Now we will explain the basic content in this regard.
Definition
IPv6 is short for Internet Protocol Version6,
100 the initial request for continue has been accepted, and the customer shall continue to send the rest of the request. (New HTTP 1.1)
101 switching protocols server converts a client-compliant request to another protocol (New in HTTP 1.1)
200 OK everything is normal, and the response document to the get and post requests follows.
The 201 created server has created a document and the location header provides its URL.
202 accepted has accepted the req
When the user is on the server of the Internet Information Service (IIS), the IIS server responds to the request and automatically returns a numeric code representing the status of the request, providing status information about the request. Also when the search engine spiders crawl in the process, the server will also be related to the HTTP status code, by understanding the HTTP status code, you can more detailed analysis of the log access.
100-Indicates that a portion of the request has been
2. Telnet protocolThe Telnet protocol is a member of the TCP/IP protocol family and is the standard protocol and main way of Internet remote Login service. It provides users with the ability to perform remote host work on the local computer. Use a Telnet program (such as Putty) on the end user's computer to connect to the server. End users can enter commands in t
1. Upload distinguishes between historical and real-time data by data type. The real-time data is1400, The historical data iscolor:blue">1410
2. Time Synchronization data packets:Time Synchronization request
3. Debugging data:
Real-Time
http://blog.csdn.net/heanyu/article/details/6202500
RTP (Real time Transport Protocol)
RTP is a transport protocol for multimedia traffic on the Internet that is published by the IETF (Internet Engineering Task Force) as RFC1889 . RTP is defined as a one-to-many transmission, with the purpose of providing time information and implementing stream synchronization. Typical applications for RTP are built on U
RTP (Real Time Transport Protocol)
RTP is a transmission protocol for multimedia data streams over the Internet.Rfc1889Release. RTP is defined to work during one-to-one or one-to-many transmission. It aims to provide time information and implement stream synchronization. Typical RTP applications are built on UDP, but can also work on TCP, ATM, and other protocols. RTP itself only guarantees the transmissio
The IP protocol is the most important protocol in the family of TCP/IP protocols, which provides unreliable, non-connected datagram transport services. So understanding IP protocols is critical to our learning network.IP headerImportant Field Introduction:4bit First ministerial degree: in 4 bytes, determines the IP head of the largest minister of 15*4=60, the general IP datagram header length of 20, at this
carrier, such as user name, e-mail address, telephone number, and also has the ability to communicate session control information to the session members.BYE: Notification departure, the primary function is to indicate that one or several sources are no longer valid, that is, the other members in the notification session will exit the session themselves.App: defined by the application itself, it solves the extensibility problem of RTCP and provides a great deal of flexibility for the implementat
function is as a member of the session on identity information carrier, such as user name, e-mail address, telephone number, and also has the ability to communicate session control information to the session members.BYE: Notification departure, the primary function is to indicate that one or several sources are no longer valid, that is, the other members in the notification session will exit the session themselves.App: defined by the application itself, it solves the extensibility problem of RT
Commands and responses to the SMTP protocol
From the previous communication model, you can see that the SMTP protocol's session between sending SMTP and receiving SMTP is done by sending SMTP commands and receiving an answer to SMTP feedback. After the communication link is established, Send SMTP send mail command message sender, if receive SMTP at this time can receive mail then make OK answer, and then send SMTP continue to Issue RCPT command to con
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