300-430 Question 82
Single answerA network engineer is implementing mDNS on a Cisco Wireless LAN Controller to allow Apple devices in a specific VLAN to discover printers and Apple TVs. The engineer wants to ensure that mDNS advertisements are only forwarded to the VLAN where the devices reside. What configuration step is necessary to achieve this?
- A
Enable mDNS snooping and configure the correct service policies.
- B
Enable multicast-to-unicast conversion on all SSIDs.
- C
Disable mDNS globally and enable it only on the desired VLAN.
- D
Create a FlexConnect group and enable mDNS snooping within it.
Show answer and explanation
Correct answer: A
Explanation
To ensure mDNS advertisements are limited to a specific VLAN, mDNS snooping must be enabled on the Wireless LAN Controller. Service policies can then be configured to filter and forward mDNS advertisements only to the desired VLAN. This prevents unnecessary mDNS traffic across the network, ensuring efficient and secure service discovery.
- A. Correct.
Correct. mDNS snooping allows the Wireless LAN Controller to filter and forward mDNS advertisements to the appropriate VLANs based on configured service policies, ensuring that devices only see relevant services in their VLAN.
- B. Incorrect.
Incorrect. While multicast-to-unicast conversion can improve traffic efficiency, it does not control the scope of mDNS advertisements to ensure they are limited to a specific VLAN.
- C. Incorrect.
Incorrect. Disabling mDNS globally would prevent any mDNS advertisements from working unless reinstated, which is not necessary to limit advertisements to a specific VLAN.
- D. Incorrect.
Incorrect. FlexConnect groups are used for specific site-based configurations, but they are not required for mDNS snooping in this scenario.