1. Wireless networks are classified according to distance
①Wireless Personal Area Network
②Wireless LAN
③Wireless Mesh network
④Wireless Metropolitan Area Network
⑤Wireless WAN
⑥ Cellular network
2. The main difference between wireless network security and wired network security
①The openness of the wireless network makes the network more vulnerable to various attacks such as passive eavesdropping or active interference
②Mobility of wireless network makes security management more difficult
③The dynamically changing topology of wireless networks makes it more difficult to implement security solutions
④ The instability of wireless network transmission signals brings about the robustness of wireless communication networks and their security mechanisms
⑤Wireless network terminal equipment has different characteristics from wired network terminal equipment
⑥The connection between wireless networks should be flexibly adapted according to the user's mobility and link quality. This is an advantage that wired networks do not have, but requires a more trusting relationship.