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A set of rules used in computer networks to specify the format of information and how to send and receive information is called a network protocol or a communication protocol. The agreement can also be said that the computer connected to the network must follow a certain technical specifications, the hardware, software and ports and other technical specifications.
Network is a place of information exchange, all access to the network of computers can be through the physical connection between the device line information exchange, the physical equipment including the most common cable, optical cable, wireless WAP and microwave, etc., but the mere possession of these physical devices can not achieve the exchange of information, It is like the human body can not lack the control of the brain, the exchange of information must also have a software environment, the "Software Environment" is a human implementation of rules, known as "Protocol", with the agreement, different computers can follow the same protocol to use the physical device, and does not cause mutual "not understanding."
This agreement is similar to "Morse code", simple 1.1 horizontal, through the arrangement can have all the changes, but if there is no "comparison table", who can not understand that the newly generated agreement is mostly based on the basic level of the agreement is established, so the agreement has a relatively high security mechanism, * * * It is difficult to find the security problems in the protocol directly to start the network * * *. However, for some new types of protocols, because of the short time and less thoughtful consideration, may also be used for security issues.
For the discussion of the network protocol, more people think: the current use of the basic protocol at the beginning of the design of a security risk, so no matter what changes in the network, as long as this network system does not make fundamental changes, it will not be able to eliminate the potential danger.
Data is encapsulated as a message or packet when it is transmitted over the IP Internet. The uniqueness of the IP protocol is that the host does not have to pre-establish a specific "path" to the host before transmitting the data in the message Exchange network. The Internet Protocol provides an "unreliable" packet transmission mechanism (also known as "best effort"), i.e. it does not guarantee that the data will be transmitted accurately. Packets may be corrupted at the time of arrival, in order of confusion (as compared to other packets sent together), generating redundant packets, or losing all. If the application needs to ensure reliability, it is generally necessary to take other methods, such as the use of IP upper layer protocol control.
Network protocols are usually composed of 3 parts: syntax, semantics, and timing relationships. A network transmission protocol or simply a Transfer protocol (Communications Protocol) is a common language for computer communication. Now the most popular computer communication for the network communication, so "transmission protocol" generally refers to the computer communication protocol, such as: TCP/IP, NetBEUI and so on. However, the transfer Protocol also exists in other forms of computer communication, such as: object-oriented programming within the communication between objects, the operating system between the different programs in the message, need to have a transmission protocol to ensure that the communication between the two sides can communicate seamlessly.
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