Ad-Hoc (point-to-point) mode: The ad-hoc mode is the same as the previous direct-connected twisted pair concept. It is a P2P connection, so it cannot communicate with other networks.

General wireless terminal devices like PMP, PSP, DMA, etc. use ad-hoc mode. In the establishment of a home wireless local area network, I think everyone knows that the easiest way is to implement wireless interconnection between two computers with wireless network cards.One of the computers can share bandwidth when connected to the Internet.Ad-Hoc structure is a peer-to-peer network structure built without wireless AP. As long as the computers with wireless network cards are installed, they can realize wireless interconnection;The principle is that a computer host in the network establishes a point-to-point connection, which is equivalent to a virtual AP.Other computers can directly connect and share the network through this point-to-point connection.

Because the wireless AP is omitted, the network setup process of the Ad-Hoc wireless LAN is very simple, but the transmission distance of the general wireless network card in the indoor environment is usuallyIs about 40m, when the effective transmission distance is exceeded,Can not realize the communication between each other; therefore this mode is very suitable for some simple or even temporary wireless interconnection needs. 

In addition, if all the computers in the program share the connection bandwidth, for example, 4 machines share the broadband at the same time. The available bandwidth of each machine is only 1/3 of the standard bandwidth.