You are testing newly purchased Cisco Wireless IP Phones on your wireless network on the 5 GHz band.
You notice that there are audio gaps during roaming.
Troubleshooting network engineers find out that the issue is caused by the use of Dynamic WEP on the SSID.
Why is this use a problem?
Click on the arrows to vote for the correct answer
A. B. C. D.B.
Dynamic WEP is a type of WEP (Wired Equivalent Privacy) encryption that dynamically generates keys for each wireless client device that associates with the wireless network. While Dynamic WEP provides some level of security, it is not considered a secure wireless encryption method because it uses a static encryption key and is vulnerable to various types of attacks.
In this scenario, the use of Dynamic WEP on the SSID is causing audio gaps during roaming on the 5 GHz band. Roaming is the process of a wireless client device moving from one access point (AP) to another while maintaining an active network connection. The issue could be caused by several factors, such as delay in authentication or encryption key exchange, interference, or signal strength.
Option A, that Dynamic WEP is incompatible with Cisco Wireless IP Phones, is not a valid explanation for the issue because Dynamic WEP is a standard encryption method that is supported by most wireless devices, including Cisco Wireless IP Phones.
Option B, that Dynamic WEP requires a full authentication with the RADIUS server during roaming, is also not a valid explanation because the authentication process should not cause audio gaps during roaming.
Option D, that Dynamic WEP requires the use of 2.4 GHz on the phones, is incorrect because Dynamic WEP can be used on any frequency band that is supported by the wireless devices.
Option C, that Dynamic WEP provides the same WEP key to several phones simultaneously, which can cause delays if a phone needs to wait for its slot time, is the correct explanation. Dynamic WEP uses a shared key authentication method, which means that the same encryption key is used for all wireless clients that associate with the same SSID. This can cause delays in communication if multiple clients try to transmit data simultaneously and need to wait for their slot time. In the case of Cisco Wireless IP Phones, this delay can cause audio gaps during roaming, especially on the 5 GHz band where the available channels are limited.
Therefore, the use of Dynamic WEP on the SSID is the problem causing the audio gaps during roaming on the 5 GHz band. The recommended solution is to switch to a more secure and robust encryption method, such as WPA2-Enterprise with AES encryption, which supports individual encryption keys for each wireless client device and provides better security and performance.