Services You Can Add

AB.

To answer this question, we need to understand the impact of the different services on the wireless network and the frequency bands used for those services.

First, we know that the site has already been surveyed for 802.11n VoWLAN services at 5 GHz. This means that the survey has already taken into account the necessary factors such as coverage, signal strength, and interference to ensure that the network can support VoWLAN services at this frequency.

A. Enhanced Layer 2 or Layer 3 security of the WLAN Adding enhanced security to the WLAN will not impact the frequency bands being used for wireless services. It only affects the authentication and encryption mechanisms used to secure the wireless network. Therefore, we can safely add this service without conducting an additional site survey.

B. Optional MFP client protection for Cisco Client Extensions Version 5 clients MFP (Management Frame Protection) is a feature that helps prevent wireless attacks by protecting the management frames that are exchanged between access points and clients. This feature is specific to Cisco Client Extensions Version 5 clients. However, enabling MFP may cause a slight increase in overhead and may impact the performance of the wireless network. Since MFP does not impact the frequency bands being used, we can safely add this service without conducting an additional site survey.

C. 802.11n data services on the 2.4 GHz Frequency D. 802.11n voice services on the 2.4 GHz Frequency The 2.4 GHz frequency band is already congested with many non-Wi-Fi devices such as microwave ovens, cordless phones, and Bluetooth devices, which can cause interference with the wireless network. Adding 802.11n data or voice services on the 2.4 GHz frequency can further increase interference and affect the performance of the wireless network. Therefore, we cannot safely add these services without conducting an additional site survey to determine if the network can support them.

E. New services (such as location) on both frequencies. The impact of new services on the wireless network depends on the specific service being added. Some services may require additional access points or antennas to be installed, which could affect the coverage and signal strength of the network. Therefore, we cannot safely add new services without conducting an additional site survey to determine if the network can support them.

In summary, the two services that can be added safely without conducting an additional site survey are enhanced Layer 2 or Layer 3 security of the WLAN and optional MFP client protection for Cisco Client Extensions Version 5 clients.