Measure the test taker's knowledge about the security measures in the wireless LAN. (1)

1. Introduction

WLAN is short for Wireless LAN, that is, Wireless LAN. The so-called wireless network, as its name implies, is an information network composed of radio waves as transmission media. As WLAN products do not need to lay communication cables, they can flexibly cope with the changing settings of various network environments. WIAN technology provides users with better mobility, flexibility, and scalability, and provides fast and cost-effective LAN access in areas that are difficult to re-wiring, wireless Bridges can be used to provide LAN access for remote sites and users. However, when users' expectations for WLAN increase daily, their security problems become the main bottleneck restricting the development of WLAN as the application expands.

2. Threats to the wireless LAN

The first thing to consider is that WLAN uses radio waves as the transmission medium for Internet access. Therefore, it is difficult to restrict physical access to network resources in wireless networks, the wireless network signal can be transmitted to a region other than the expected location. The specific situation depends on the building materials and the environment, so that the network coverage has become a WLAN Access Point, allow intruders to access the WLAN outside the expected range, intercept data in the network, and intrude into the WLAN application to attack the wireless network, of course, after the intruders have the network access rights.

Secondly, because WLAN is still a computer network that complies with all network protocols, computer viruses also threaten computers in all WANs, it may even cause more serious consequences than normal networks.

Therefore, WLAN security threats include eavesdropping, interception or modification of transmitted data, confidence attacks, and denial of service.

VipinJain, inventor of IEEE 802.1x authentication protocol, said in an interview with the media: "when talking about wireless networks, IT managers are most worried about two things: first, there are too many standards and security solutions on the market, second, how can we avoid network intrusion or attacks? Wireless media is a shared media that is not limited by the physical boundaries of buildings. Therefore, it is very easy for someone to intrude into the network ." Therefore, WLAN security measures have a long way to go.