Answer: Wired Equivalent Privacy (WEP) has the major disadvantage of having a shared key of encryption for all the clients.
Explanation: Wired Equivalent Privacy (WEP) is the protocol for providing the security to the WiFi and other network of 802.11 standard. It secures the data in by the method of encryption.Though it has a drawback that it encrypts the the data in shared key form and it has most chances of not able to change the key which is not a convenient feature for the clients.