arpanet belongs to the "packet switching" network. Arpanet is a computer network centered on the communication subnet, mainly based on packet switching. ARPNET proposed the concepts of communication subnet and resource subnet. The communication subnet is responsible for the communication control processor and communication line (IMP) for data communication processing, and the resource subnet is responsible for the main computer and terminal (Edge) for data processing. During the communication process, the communication method in which the two communicating parties use packets as units and use a store-and-forward mechanism to interact with data is called packet switching.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
arpanet belongs to the packet switching network.
arpanet belongs to the second generation network. It is a computer network centered on the communication subnet. It is a new network resource exchange model after the first generation network. Mainly packet switching.
ARPNET proposed the concepts of communication subnet and resource subnet. The communication subnet is responsible for the communication control processor and communication line (IMP) for data communication processing, and the resource subnet is responsible for the main computer and terminal for data processing ( Edge).
Packet switching
During the communication process, the communicating parties use the storage and forwarding mechanism to realize data exchange in units of groups. The communication method is called packet switching (PS: packet switching).
Packet switching is also called packet switching. It divides user communication data into multiple smaller data segments of equal length, and adds necessary control information in front of each data segment as the header of the data segment. , each data segment with a header constitutes a packet. The header specifies the address to which the packet is sent. When the switch receives the packet, it will forward the packet to the destination based on the address information in the header. This process is packet switching. A communication network capable of packet switching is called a packet switching network.
The essence of packet switching is storage and forwarding. It temporarily stores the received packets and queues them on the route in the destination direction. When it can send the information, it sends the information to the corresponding route to complete the forwarding. . The process of storage and forwarding is the process of packet switching.
The idea of packet switching comes from message switching. Message switching is also called store and forward switching. The essence of their switching process is store and forward. The difference is that the smallest information unit of packet switching is a packet. Message exchange is message by message. Because transmission and switching are performed in smaller packet units, packet switching is faster than message switching. Message switching is mainly used in public telegraph networks.
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