Briefly describe the characteristics of the five network topologies

The star network topology is characterized by the fact that each network access machine requires physical lines to interconnect with the processor. The bus network topology is characterized by multiple machines sharing a transmission channel. The ring network topology is characterized by good real-time performance. The mesh network topology is characterized by a large geographical scope. The tree network topology is characterized by easy expansion and convenient management.

1. Star network topology:

is dominated by a central processor (communication equipment) In the network formed, other network-connected machines only have direct physical links with the central processor. The central processor uses time-sharing or polling methods to serve network-connected machines, and all data must pass through the central processor.

Characteristics of star network:

(1) The network structure is simple and easy to manage (centralized)

(2) Each network access machine requires physical lines and processing Machines are interconnected, and the line utilization is low;

(3) The processor is heavily loaded (needs to process all services), because any exchange of information between two network-connected machines must pass through the central processor;

(4) Failure of the network host will not affect the normal operation of the entire network, but failure of the central processor will cause network paralysis.

Applicable occasions: LAN, WAN.

2. Bus-shaped network topology:

All network-connected devices share a physical transmission line, and all data is sent to the same line and can be connected online All device awareness on the road. The network access equipment is connected to the line through a dedicated tap. Bus network topology is a form of local area network.

Characteristics of the bus network:

(1) Multiple machines share a transmission channel, and the channel utilization rate is high;

(2) Only two machines can be used at the same time Computer communication;

(3) The failure of a certain node does not affect the work of the network;

(4) The extension distance of the network is limited and the number of nodes is limited.

Applicable occasions: local area network, environments that do not require high real-time performance.

3. Ring network topology:

Network access devices access the network through transponders. Each transponder only has direct connections with two adjacent transponders. Physical lines. The data transmission of the ring network is unidirectional, and the data sent by one transponder can only be received and forwarded by another transponder. All transponders and their physical lines form a ring network system.

Features of ring network:

(1) Good real-time performance (the maximum time for information transmission in the network is fixed);

(2) Each node only communicates with Two adjacent nodes have physical links;

(3) The transmission control mechanism is relatively simple;

(4) The failure of a certain node will cause physical paralysis;

(5) The number of nodes in a single ring network is limited.

Applicable occasions: local area network, environment with high real-time requirements.

4. Mesh network topology:

Use a mesh network composed of node machines specifically responsible for data communication and transmission, and the network-connected devices directly access the nodes. machine to communicate. Mesh networks usually use redundant equipment and lines to improve network reliability. Therefore, node machines can selectively send data to different lines based on the current network information traffic.

Applicable occasions:

Mainly used in environments with a large geographical scope and many hosts (multiple models) connected to the network, and is often used to construct wide area networks.

5. Tree network topology:

Advantages: low cost, easy to expand, easier to manage, and easier to isolate faults.

Disadvantages: The root node is highly dependent. If a failure occurs, the entire network will not work properly.

For more related knowledge, please visit: PHP Chinese website!

The above is the detailed content of Briefly describe the characteristics of the five network topologies. For more information, please follow other related articles on the PHP Chinese website!