23. How WRED works? Explain in detail. What are the advantage over RED.

I found good explanation related to RED and WRED at below cisco link.

http://www.ciscopress.com/articles/article.asp?p=352991&seqNum=8

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conavd/configuration/15-mt/qos-conavd-15-mt-book/qos-conavd-wred-ecn.html