What are the shortcomings of WEP security?

What are the shortcomings of WEP security?

Please answer the following questions in your own words. Please cite any sources that you may use. 1. What are the shortcomings of WEP security? 2. Why was there a need for WPA/WPA2? 3. What are the main threats to wireless security? 4. What are the best practices for ensuring security on a wireless network?