cdp protocol

Internet Layer Protocol FeaturesRunning on the OSI network layerNon-connection oriented protocolProcessing data packets independentlyLayered addressingBest effort transferNo Data recovery functionThe Internet layer mainly contains IP, ICMP, ARP, rarp several protocols.This is a major IP protocol.IP PDU HeaderFirst line: 4bit identifies the protocol version of IP Good, now the generic ipv4;4bit identifies th

Small Knowledge Points: Socket: An interface between the application layer and the transport layer, one endpoint of the communication. Divided into streaming sockets (providing bidirectional ordered without duplication, no boundary record of the data stream) and datagram Sockets (bidirectional, not guaranteed to be reliable and orderly and without duplication). Port: integer identifier, 16 bit, 0~65535,1024 below is reserved bit, such as 80 is HTTP port, 21 is FTP communication port. 1024~49151

Added the AXI4 specification (the specification for in-SOC IP interconnect developed by ARM and XILINX), with the addition of the Advanced System Bus (ASB) and advanced Peripheral Bus (APB) to the latest version of AMBA4.0, from the very beginning of the AMBA1.0 version definition to the AHB APB, the Advanced tracking bus ATB, et. The AHP APB Axi can be considered as the bus protocol or specification within the scope CPU, however we often refer to the

Tags: how to profile mode routing different structure query technology useModbus Communication protocol:Introduction: Modbus protocol is a common language used in electronic controllerThrough this protocol, the controller is connected to each other via a network (e.g. Ethernet)and other devices can communicate, he has become a general industry standard, has itcontrol equipment produced by different manufact

The scene will encounter the field data for Modbus protocol, but the backend system for the DLT645 protocol system, this module support the conversion of industrial MODBUSRTU protocol to Meter GB protocol DLT645 protocol, support 1997 and 2007 standard, only need simple conf

Chapter 3 _ IP Internet Protocol IP header IP protocol is the most core protocol in the TCP/IP protocol family. All TCP, UDP, ICMP, and IGMP data are transmitted in IP datagram format. The IP address provides unreliable and connectionless services. Unreliable: IP datagram cannot be successfully delivered to the destina

What is the working principle of HTTP? How to optimize the HTTP protocol ?, Protocol Working Principle Optimization made by http1.0 Bandwidth: latency has been solved at this stage: 1. browser blocking: the browser can only connect to the same domain name with four connections at the same time. latency: 2. DNS query: The Browser needs to know the IP address of the target server to establish a connection del

Send the monkeys to the reinforcements.An RFC document on ICMP here!What the hell?In my opinion, the ICMP protocol is mainly to pass/query some basic information to each other, most of which is to pass some error message.For example, a sends the UDP message to B's 10000 port, but B's 10000 port does not open, it will return an ICMP packet to a, tell the A10000 port is not open.Basic query information, such as the most commonly used ping command, is to

OverviewBoth TCP and UDP use the same network-layer IP, but unlike UDP, TCP is a connection-oriented, reliable byte-stream protocol. Therefore, both parties must establish a TCP connection before transmitting the data. TCP realizes the transmission of reliability through the mechanism of verification, serial number, acknowledgment response, retransmission mechanism, Connection management and window control.TCP provides reliability in the following way

To put it simply, the svn + SSH (SVN over SSH) protocol works by establishing an SSH connection between the svn client and the server, and then pushing commands and transmitting data through the SSH connection, to achieve more secure SVN communication through SSH. Using SVN + SSH to access repository is the biggest difference from common HTTP or HTTPS methods, or the only difference is to log on to the remote host through SSH Security Authentication T

Msnp9 Protocol Analysis Report 1. Connection The MSN Messenger protocol is built on TCP/IP. In addition to direct "point-to-point" communication between file transmission and voice chat, all other scenarios are performed through the server. Logically, there are three types of servers with their respective roles: Dispatch server (DS)-the server on which the client first connects. Allocates appropriate notif

DHCP protocol Introduction DHCP, full name: Dynamic Host Configuration Protocol, Chinese name: Dynamic Host Configuration Protocol, its predecessor is BOOTP, it works at the OSI application layer, it is a proprietary protocol that helps computers obtain their configuration information from a specified DHCP server.DHCP