When your wireless client device roams from one AP to another on the same network, which IEEE protocol can be used to authenticate the clients faster?
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A. B. C. D. E. F.B.
At a basic level,roamingin an enterprise IEEE 802.11 network occurs when an IEEE 802.11 client changes its access point (AP) association from one AP to another AP within the same WLAN.
Depending on client capabilities, an 802.11 WLAN client may roam on the same WLAN between APs within the same frequency band or between the 2.4 GHz and 5 GHz frequency bands.
Smartphones and tablets that have simultaneous cellular and Wi-Fi connections may seamlessly roam across networks provided there is a suitable infrastructure network design.
When a clientroams from a WLAN with one service set identifier (SSID) to a WLAN with another SSID, the roam will not be seamless.
The Wi-Fi client logic maintains only one Wi-Fi WLAN authentication at a time.
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/RToWLAN/CCVP_BK_R7805F20_00_rtowlan-srnd/When a wireless client device moves from one access point (AP) to another, it is called a roam. During the roam, the client must re-authenticate with the new AP, which can cause a brief interruption in connectivity. The IEEE has developed two protocols that can help to reduce this interruption: 802.11k and 802.11r.
802.11k, also known as Radio Resource Management (RRM) or Assisted Roaming, is a protocol that enables an access point to provide information about neighboring APs to the client. This information can help the client to choose the best AP to roam to, based on factors such as signal strength and channel availability. This can improve roaming performance and reduce the likelihood of the client connecting to an AP with poor performance.
802.11r, also known as Fast BSS Transition (FT), is a protocol that enables a client to pre-authenticate with a neighboring AP before it roams. This pre-authentication enables the client to establish a security context with the new AP before it actually connects, which can reduce the time it takes to reconnect to the network after the roam. This can be particularly beneficial for applications that require low latency, such as voice over IP (VoIP).
Therefore, the correct answer to the question is D. 802.11r, also called Fast BSS Transition. It is important to note that while 802.11k can also improve roaming performance, it does not provide pre-authentication and therefore does not offer the same level of improvement as 802.11r.