cdp protocol

ICMP and IGMP protocols are the basic protocols in the tcp ip protocol stack. Therefore, message control is the main task of ICMP. For IGMP, the main task is to pass the information to the router. Let's take a look at the specific explanations of the two protocols below. Internet Control Message Protocol ICMP is used to report errors and control messages on behalf of IP addresses. The IP address uses the I

Turn from:Http://blog.chinaunix.net/uid-9112803-id-3212041.htmlSummary:In this paper, we briefly introduce the theory of TCP-oriented connection, describe the meanings of each field of TCP messages, and select TCP connections from Wireshark capture packet to establish the relevant message segment.I. OverviewTCP is a reliable connection-oriented transport protocol, two processes to send data before the need to establish a connection, where the connecti

Vamei Source: Http://www.cnblogs.com/vamei Welcome reprint, Please also keep this statement. Thank you!"The trumpet starts to broadcast", if you know this, you must be the older generation. "Little Horn" is a radio program for children from the 50 's to the 80 's. At the beginning of the program, there will be a kind of broadcast: "Children, small speakers began to broadcast!" "Hearing here, the children in front of the radio get excited and ready to listen to the program: This issue is the Ethe

End-to-end asynchronous communication protocol:Features and formats:The characteristic of a start-stop asynchronous protocol is a character transfer, and the transmission of a character always begins with the starting bit, ending with a stopped bit, and there is no fixed time interval between the characters. Its format is shown in 3. Each character is preceded by a starting bit (low level, logical value 0), the character itself has a 5~7 bit data bits

Reprinted: http://hi.baidu.com/liuhann/item/d644cfd873c904ffcb0c39b1 Two-phase submission Protocol The key to implementing distributed transactions is the two-phase commit protocol. In this Protocol, one or more Resource Manager activities are controlled by a separate software component called the Transaction Coordinator. The five steps in this

. Net platform, Socket communication protocol middleware design ideas (with source code), socket communication protocol On the. net platform, there are many ways to implement communication processing (see the table below), each of which has its own advantages and disadvantages: Serial number Implementation Method Features 1 WCF Advantages: good encapsulation and convenience. Di

Many sites, such as Facebook or some blogs, allow users to upload or download files, such as pictures of a forum or blog system. In this case, there are usually two options for uploading files to the server, which is the FTP protocol and the HTTP protocol.The differences between the two are listed below:1, the HTTP protocol is used to browse the site, and FTP is used to access and transfer files, FTP file t

[Android] android communication protocol and android communication protocol 1. Data Differentiation Mobile Phone: constant Storage Server: Database Table creation and storage 2. Data Source Android, ios, pc, wap 3. Data collection and data mining IMEI: device ID IMSI: SIM card number 4. Data Encryption 4.1RSA Algorithm 4.2 simple code processing: SimpleDateFormat + Random value (Random) 4.3 Data Digest:

NEC protocol for infrared Protocol NEC protocol carrier: 38 khz The representation of logic 1 and logic 0: The logic 1 is 2.25 ms, the pulse time is 1.12 us, the logic 0 is ms, and the pulse time is us. Therefore, we decode the time based on the pulse length. The recommended carrier duty cycle is 1/3 to 1/4. NEC protocol