An engineer is implementing a FlexConnect group for access points at a remote location using local switching but central DHCP.
Which client feature becomes available only if this configuration is changed?
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A. B. C. D.B.
FlexConnect is a feature in Cisco wireless controllers that allows access points (APs) to locally switch client traffic while still maintaining a centralized control plane. This feature is useful in remote locations where limited WAN bandwidth is available or where it is important to maintain network services during WAN link failures.
When FlexConnect is configured for local switching and central DHCP, client devices receive their IP addresses from a central DHCP server, but their traffic is switched locally by the AP rather than being tunneled back to the controller. In this configuration, some client features may not be available.
Out of the given options, the feature that becomes available only if this configuration is changed is mDNS (Multicast Domain Name System) or Bonjour, which is a service discovery protocol used by Apple devices.
When APs switch traffic locally, they do not forward multicast traffic across the WAN to the controller. Multicast traffic is limited to the local subnet, which means that mDNS service discovery packets will not reach devices on other subnets. This can cause issues with device discovery, as devices may not be able to discover and connect to services running on other devices.
To enable mDNS across subnets, the FlexConnect group configuration must be changed to enable central switching. This allows multicast traffic to be forwarded back to the controller, which can then forward it to other subnets using multicast routing protocols.
Therefore, the correct answer is D. mDNS.