Final answer:
Rekeying is a challenge with WEP due to the use of a static key for encryption and the vulnerabilities of WEP. Updating the key on all devices connected to the network can be time-consuming and disrupt the network's availability.
Step-by-step explanation:
Rekeying is a challenge with WEP (Wired Equivalent Privacy) because it uses a static key for encryption. This means that the same key is used for all devices and remains unchanged until manually updated. As a result, if an unauthorized person obtains the key, they can easily decrypt the network traffic.
Since rekeying involves changing the encryption key, it may require updating the key on all devices connected to the network. This process can be time-consuming and may disrupt the network's availability during the rekeying process.
Furthermore, WEP has been deemed insecure due to its vulnerabilities, such as weak encryption algorithms and easily guessable keys, which further exacerbates the challenge of rekeying.