What does WLAN mean? WLAN knowledge popularization introduction

Many friends are asked a lot of WLAN problems when setting up the network, most of the wireless to replace the power of the cable! Then you should have this experience. You have deployed a WLAN that supports capacity growth. The installation process went smoothly, but after a few months, people complained about wireless LANs more and more. Now they have more needs, such as wireless bandwidth management, access control and new types of attacks.

For those, Search Networking experts LisaA.Phifer wireless WLAN answered five questions from readers, in addition to basic network implementation, network management problem for which there is a network engineer?

WLAN Issue 1: Wi-Fi and Cellular Network Options

Problem: Many wireless devices can connect to mobile data networks or Wi-Fi networks. Should the connection method of enterprise equipment be mobile network or Wi-Fi?

Expert Answer: Mobile (3G/4G) data network is an ideal uninterrupted connection method for WAN. However, there is always a problem with insufficient signal strength in our outdoor activities, resulting in slow connections or data loss. While there are some places that offer outdoor Wi-Fi networks, most Wi-Fi hotspots are designed to cover indoor spaces such as hotels, convention centers, airports or airplanes.

Therefore, the choice of mobile network and Wi-Fi depends first on location and mobility. We will increasingly use wireless devices that support both networks, and even auto-roam between them. By default, most smartphones prefer to use Wi-Fi, and only use the mobile network when the Wi-Fi connection is not available.

WLAN Question 2: Will nearby businesses gain unauthorized access?

Question: If a nearby company connects to our Wi-Fi network in a densely populated area, Is there a problem? If our employees connect to the network of nearby companies through an unauthorised network, what is the problem?

Expert answer: In short: definitely a problem. At least the use of someone else's network without permission is a theft of services. Although there are very few lawsuits in this regard, there have been cases in which Wi-Fi has been punished. Uninformed or poor supervision will result in no defense.

WLAN Problem 3: How do I connect Wi-Fi and LAN at the same time?

Problem: I can't connect Wi-Fi and LAN on the same computer at the same time. I have a LAN that is not connected to the Internet, and a Wi-Fi connection to the Internet. When using Windows XP, I was able to access the network hard drive by connecting to the LAN while connecting to the Internet via Wi-Fi. However, now with Windows 7, I can't connect to the Internet and LAN at the same time, I have to switch back and forth between the two networks.

Expert Answer: Whether on Windows XP or Windows 7, you should be able to connect to two different networks at the same time. The problem you are experiencing may be an unexpected situation or for other reasons.

If your two connections are on different subnets, each connection is a route to the subnet, but only one connection can serve as the default gateway for all destinations of your computer, such as the Internet.

WLAN Problem 4: How to Avoid WPS Attacks?

Question: What steps should corporate WLAN administrators take to protect the network from new Wi-Fi protected settings? Attacks by WPS) attack tools, such as the recent popular Reaver and wpscrack?

Expert Answer: For large enterprises, the good news is that few enterprise-level access terminals now implement vulnerable Wi- Fi Protected Setup (WPS) protocol, because tools such as Reaver and wpscrack can attack unauthorized WLAN access by attacking it. The bad news for SMB and very fragmented branch networks is that more than 1,500 consumer-grade Wi-Fi routing products are available on the market, and one-third are vulnerable.

WLAN Problem 5: How to maintain data caps through bandwidth monitoring?

Problem: Due to bandwidth limitations on 3G and 4G networks, new cloud content such as iCloud has appeared. Synchronization services, how do wireless bandwidth data users monitor network bandwidth and avoid exceeding the upper limit?

Expert response: Monitoring bandwidth has always been a challenge for wireless broadband users. Accessing the operator's website and manually monitoring data is certainly not feasible, and new cloud applications have further increased broadband usage. For some users, it may be the first time that a problem has been known by accidentally receiving a large bill of payment. It's not easy to determine which apps or settings are causing traffic to be too fast.