Ten questions about the necessary knowledge of qualified network management

Today, with the wide application of computers and the popularity of the network, more and more units and departments began to introduce computer network management, so that the corresponding need for more excellent management network. Have a few years of "brain-age" you have become a network management ambition? Before you become a qualified network administrator, you must first find out the following 10 questions. If you do not have the most basic knowledge of network management, then how can you not fill this class?

1. What is a computer network?

This is one of the first issues that must be addressed, and it is definitely the core concept. We speak of the computer network, in fact, is the use of communication equipment and lines will be geographically different, independent functions of multiple computer systems to interconnect, to full-featured network software (i.e. network communication protocol, information Exchange Mode and network operating system, The system that realizes resource sharing and information transmission in network. Its function is mainly in two aspects: one is to achieve resource sharing (including hardware resources and software resources sharing), and the other is to exchange information between users. The role of the computer network is to not only allow computers scattered across the network to share all the resources on the web, but also to provide users with a strong means of communication and services as perfect as possible, thus greatly user-friendly. From the point of view of network management, it is the use of technical means to realize the information transmission between the network, while providing services to users.

2. What are the components of the computer network?

Computer networks are usually made up of three parts, which are resource subnets, Communication subnet and communication protocol. The so-called communication subnet is the part of the computer network responsible for data communication; The resource subnet is the user-oriented part of the computer network, which is responsible for the application-oriented data processing, and the rules and conventions that the communication parties must abide by are called communication protocols, and their existence is the fundamental area of computer network and the interconnection system of common computers. Don't. So from this point of view, we should be more able to understand the computer network for what is the development of computer technology and communication products.

3. How to divide the computer network?

The most common method of partitioning is the size of the geographic area covered by the computer network, which is generally divided into wide area networks (WANs) and local area networks (LANs) (and, in addition, an additional metropolitan area Network (MANS)). As the name suggests, the so-called WAN is only geographically distant network connection form, such as the famous Internet network, Chinanet network is a typical WAN. A local area network usually does not exceed 10 km, and is often limited to a single building or a group of buildings that are very close to each other. Novell network is currently the most popular computer LAN.

4. What is the system structure of the computer network?

In computer network technology, the network architecture refers to the overall design of communication system, which is designed to provide standards for network hardware, software, protocols, access control and topology. The reference model for Open Systems Interconnection OSI (open System Interconnection) is now widely used, It is the physical layer, the data link layer, the network layer, the transport layer, the dialogue layer, the presentation layer and the application layer seven levels describe the structure of the network. You should be aware that the advantages and disadvantages of the network architecture will directly affect the bus, interface and network performance. The key element of network architecture is protocol and topology. The most common network architectures are FDDI, Ethernet, Token Ring network and Fast Ethernet.

5, what is the agreement of the computer network?

Just now, one of the key elements of Network architecture is network protocol. The so-called Protocol (PROTOCOL) is a formal description of the rules that must be followed to exchange data between data formats and computers, and its role is the same as that of Mandarin. Ethernet (Ethernet), NetBEUI, ipx/spx, and TCP/IP protocols are commonly used depending on the network. Ethernet is the most common network low-level protocol in the general Line protocol, which is easy to install and inexpensive, while NetBEUI can be said to be a network protocol designed for small LAN. Installing the NetBEUI protocol is sufficient for small LANs that do not need to communicate across routers to large hosts, but if you need to route to another LAN, you must install Ipx/spx or tcp/ IP protocol. The former is almost synonymous with Novell network, and the latter is adopted by the famous Internet network. In particular, TCP/IP (Transmission Control Protocol/Network Protocol) is one of the earliest protocols in the Open System Interconnection protocol, and is the most complete and widely used protocol at present. It can realize the connection, communication and communication between various computer platforms.

6. What is the topological structure of the computer network?

The topological structure of computer network refers to the form of connection of each site in the network, and the connection form of file server, workstation and cable is clear in the LAN. The main topologies now are the total line topology, star topology, ring topology, and their hybrid type. As the name suggests, the total line style is actually the file server and workstations are connected to a common cable called the bus, and the bus must have a terminator at both ends; the star topology is the central connection point of a device, each workstation is connected directly with it to form a star, and the loop topology is to connect all the sites serially. Forming a loop like a chain; mixing the three most basic topologies is a mixture of nature.