The switching methods in the computer network can be divided into circuit switching, message switching and packet switching. Let’s take a look at these three switching methods.
table of Contents
Packet switching (the key content)
Circuit switching
The above form will greatly increase the number of telephone lines later.
Every phone is connected to a switch, and the switch adopts a switching method, which is called circuit switching.
Circuit switching is connection-oriented, so it has the following three processes:
1. Establish a connection
2. Communication
3. Release the connection
Disadvantages:
1. The computer data is bursty
2. The utilization rate of the communication line is very low
This greatly reduces the number of telephone lines
Message exchange:
Information is stored and forwarded in units of messages (logically complete information segments).
Features:
1. High line utilization
2. Requires large buffer for intermediate nodes
3. Long delay time
Packet switching (the key content):
Packet switching can be seen as an improvement of the message exchange method. The message is divided into shorter and fixed-length data segments at the sender, and then a header is added to each data segment, which contains address information. In the process of forwarding, the next forwarding position is determined. After the receiving end receives the data segment of the packet, it will strip the header of the data segment and restore it to a message.
