Each network can contain only one network topology

Fig. A star network consists of a central node and other slave nodes, and the central node can communicate directly with the slave node, and the slave nodes must pass through the central node to communicate. In a star network, the central node is usually acted by a device called a hub or switch, so computers on the network communicate with each other through hubs or switches, which is the most common way of local area network. Fig.

Schematic diagram of a star network. Fig.

Star network physical map.

The bus network is a relatively simple computer network structure, which adopts a transmission medium called a common bus, which directly connects each computer with the bus, and the information is broadcast and transmitted node by node along the bus medium. Fig.

Bus-based networking.

A ring network connects computers into a ring. In a ring network, each computer is numbered sequentially according to its location, as shown in the figure.

In a ring network, the signals are numbered in order of the computer.

If the computer.

aI want to transfer data to a computer.

d, it must be transmitted to the computer first. b Computer.

After receiving the signal, B found that it was not for himself, so he transmitted it to the computer.

cThis is done until it is transferred to the computer. D Figure.

Ring network. In practical applications, the above three types of networks are often used comprehensively and form an interconnected network. An Internet network is a larger computer network that connects two or more computer networks.

The topological structure of computer networks mainly includes: bus topology, star topology, ring topology, tree topology and hybrid topology.

1. Star network topology:

Advantages: simple control; Easy fault diagnosis and isolation; convenient service;

Disadvantages: cable length and installation workload are considerable; **The burden on the node is heavy, forming a bottleneck; The distributed processing capacity of each site is low.

2. Bus network topology:

Advantages: the bus structure requires a small number of cables; The structure is simple and passive, with high reliability; It is easy to expand, and it is convenient to add or remove users.

Disadvantages: limited transmission distance, limited communication range; Difficulty in fault diagnosis and isolation; Distributed protocols do not guarantee timely transmission of information and do not have real-time capabilities. The site must be intelligent and have access control capabilities, increasing the overhead of the site's software and hardware.

During the formation of network topology

First, it is assumed that there are many nodes arranged in a plane, and there is a discrete clock that moves uniformly, and the time of each node entering the network is recorded through this clock, and the recorded time is randomly distributed. The behavior of each node before and after entering the network is to receive information or messages and send a response to the received information. These messages are given priority and scope of communication, which will have the most direct impact on the scope of the message.

Refer to the above content: Encyclopedia - Topology.

A single-line structure is not a topology of a computer network.

Computer network topology refers to the distribution and connection status of devices between networks composed of computers, and it is generally marked on the diagram to indicate the location of the device, the name type of the device, and the type of connection medium between the devices, which is divided into two types: physical topology and logical topology.

The topological structure of a computer network refers to the physical composition mode of nodes and lines formed by computers or equipment and transmission media on the network.

There are two types of network nodes: one is the transfer node that converts and exchanges information and interest, including node switches, hubs and terminal controllers; The other type is access nodes, including computer hosts and terminals. Threads represent a variety of transmission mediums, both tangible and intangible.

A star topology is made up of nodes and individual sites connected to nodes via point-to-point communication links. Nodes enforce a centralized communication control strategy, so nodes are quite complex and have little burden of communication processing at each site.

The switching modes used in the star network include circuit switching and message switching, especially circuit switching. Once a channel connection is established, this structure allows data to be transferred between the two connected sites without delay. The popular Private Branch Exchange (PBX) is a typical example of a star topology.

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The form in which the various sites in the network are connected to each other is called a topology. The network topology can be classified according to the shape, which are: star, ring, bus, tree, bus star and mesh topology.

The star topology connects each node with the central node in a radial arrangement, and the communication of the whole network is controlled through the central node. The bus computer network topology is mainly connected to the surrounding nodes through a high-speed backbone cable. The ring computer network topology can cycle the information at the end of the node to form a closed ring line and improve the integrity of single transmission.

The tree computer network topology can ensure the loop-free transmission between the two nodes and ensure the convenience of computer network topology expansion. The mesh computer network topology connects the lines between the nodes in a mesh manner, which effectively improves the reliability of information transmission between the lines.

Analysis of network topology and its advantages and disadvantages.

Network topology.

1. Star topology.

A star topology is made up of nodes and individual sites that are connected to nodes through point-to-to communication links.

Star topology has the following advantages:

1) Simple control.

2) Easy fault diagnosis and isolation.

3) Convenient service.

Disadvantages of star topology:

1) The cable length and installation workload are considerable.

2) The burden of the node is heavier, forming a bottleneck.

3) The distribution processing capacity of each station is low.

2. Bus topology.

The bus topology uses a channel as the transmission**, and all stations are directly connected to this common transmission via the corresponding hardware interface, which is called the bus.

Advantages of the bus topology:

1) The number of cables required for the bus structure is small.

2) The bus structure is simple, and it works passively, with high reliability.

3) Easy to expand, it is more convenient to add or decrease users.

Disadvantages of bus topologies:

1) The transmission distance of the bus is limited, and the communication range is limited.

2) Fault diagnosis and isolation are difficult.

3) The distributed protocol cannot guarantee the timely transmission of information and does not have real-time functions.

3. Ring topology.

A ring topology network consists of a closed loop of sites and links to call connecting stations.

Advantages of ring topology:

1) The cable length is short.

2) When adding or removing workstations, only a simple connection operation is required.

3) Optical fiber can be used.

Disadvantages of ring topology:

1) Node failures will cause network-wide failures.

2) Difficulty in fault detection.

3) The access control protocol of the ring topology adopts the method of token transmission room delivery, and the channel utilization rate is relatively low when the load is very light. 4. Tree topology.

The tree topology Hengkai evolved from the bus topology and is shaped like an inverted tree, with the roots at the top, branches below the roots, and each branch can also have sub-branches.

Advantages of tree topology:

1) Easy to scale.

2) Fault isolation is easier.

Disadvantages of tree topology: individual nodes are too dependent on the root.

The topology of the network is divided into star, bus, ring, tree, mesh, etc.

1. Star type: the respective cables are connected to the network, such as a problem at one site of Bizhaguo, it will not affect the operation of the entire network.

2. Bus type: a transmission medium called a common bus is used to directly connect each computer with the bus, and the information is broadcast and transmitted node by node along the bus medium.

3. Ring type: data is transmitted between nodes in the loop along the direction of one change, and information is transmitted from one node to another node in the network topology.

4. Tree: It is a hierarchical centralized control network, except for the leaf node and its connected line, the system will be affected by the failure of any node or its connected line.