ports and protocols

1. Network Transmission: physical layer, data link layer, network layer, transmission layer, Session Layer, presentation layer, and Application Layer 2. Transmission Unit: transmission unit of the physical layer: Data bit stream (BITs) and data link layer transmission unit: data frame) Transmission unit at the network layer: Packet and transmission unit at the transmission layer: Message) The transmission unit at the Session Layer: Message and the transmission unit at the presentation layer: Mes

What is a license agreement?What is license? When you issue a license for your product, you are transferring your rights. However, you still have copyrights and patents (if you have applied for a license). The purpose of the license is, provide certain permissions to users who use your product.Whether the product is distributed to the public for free or sold, it is very useful to develop a license agreement. Otherwise, for the former, you give up all your rights, no one is obligated to express y

The most basic concepts in network programming are connection-oriented (connection-oriented) and non-connected (connectionless) protocols. In essence, the difference between the two is not difficult to understand, but for those who are just beginning to network programming, it is a very confusing problem. The problem is somewhat related to the context: Obviously, if two computers are to communicate, they must be "connected" in some form, what does "no

Vswitch Optical Fiber ports are divided into many types, and their functions are quite different. Here we will mainly introduce some basic knowledge about common optical fiber ports of vswitches. Cascade uses both common ports and special MDI-II ports. A straight-through cable should be used when the two

Windows has many open ports. When you access the Internet, network viruses and hackers can connect to your computer through these ports. To change your system to a copper wall, you should close these ports, mainly including TCP 135, 139, 445, 593, 1025, and UDP 135, 137, 138, and 445, some popular Backdoor Ports (suc

above two ports are in use (many chat with a few friends at the same time), add them in sequence. Note later:TCP (Transport Control Protocol) is a reliable connection-oriented communication protocol. To ensure the reliability of transmission, technologies and measures such as validation and re-transmission will be taken; user Data Protocol (UDP) is a non-reliable connection protocol. Although the reliability is not guaranteed, but it also has advan

Common Linux ports nbsp; famous ports nbsp; 1tcpmuxTCP port service multiplexing nbsp; 5e E remote job portal nbsp; 7echoEcho Service nbsp; 9discard: Null service used for connection testing nbsp; 111_at is used to list connected terminals Common Linux ports Famous Port 1 tcpmux TCP port service multiplexing 5. objective E remote job portal 7. echo service

About Apache:Apache HTTP Server is an outstanding representative of open source software projects, providing web browsing services based on standard HTTP network protocols and maintaining over half of the Web service area over the long term. Apache servers can be run on Linux, Unix, Windows and many other operating system platforms.The main features of Apache:1. Open source code;2. Cross-platform application;3. Support various WEB programming language

The relationship between the network level protocol and the structure system between the LAN and the Internet communication is completed with the support of different network levels and network level protocols. So what are their definitions and functions? How can we locate the protocol, structure, system, and hierarchy? Next, let's take a few more details. 1. Several Basic concepts in a hierarchical architecture (1) Protocol is a communication Protoco

Introduction to TCP/IP and other network protocols 1. TCP/IP is a communication protocol for the Internet. Computer Communication Protocols are descriptions of the rules that computers must comply with in order to communicate with each other. TCP/IP refers to the Transmission Control Protocol/Internet Protocol (Transmission Control Protocol/Internet Protocol ). TCP/IP defines how electronic devices (such as

We all know that the destination address can be effectively selected for data distribution when the routing selection protocol is used. So how can we allocate resources when multiple protocols coexist? Now let's talk about this issue. I. Redistribution 1. Redistribution means that when an organization runs multiple routing protocols, it must notify the network learned by one routing protocol to the other by

Translated from: http://blog.chinaunix.net/uid-27105712-id-3266286.htmlCommunication protocol can understand two nodes in order to work together to achieve information exchange, negotiate certain rules and conventions, such as the provision of byte order, each field type, using what compression algorithm or encryption algorithm. Common protocols such as TCP,UDO,HTTP,SIP are commonly found. The protocol has process specifications and coding specificati

that the Redis client communicates with Redis, and the communication protocol specifies the format of the command and return values. Understanding the Redis communication protocol not only allows you to understand the format of the AoF file and the contents of the master database to be sent from the database during master-slave replication, but also to develop your own Redis client (although there are corresponding Redis clients in almost all common languages). There is really not a lot of oppo

handshake protocol. SSL is developed by Netscape to protect Web communication. The current version is 3.0. The latest version of TLS 1.0 is a new protocol developed by IETF (engineering task group). It is based on the SSL 3.0 protocol specification and is a later version of SSL 3.0. The difference between the two is very small. it can be understood as SSL 3.1, which is written into RFC.SSL (Secure Socket Layer) is developed by Netscape to ensure the security of data transmission over the Intern