300-425 Question 85
Single answerA university is deploying a wireless network to support Apple TV devices in classrooms. The IT team wants to ensure that users on the same VLAN can discover and connect to these devices using mDNS. However, they also want to restrict mDNS traffic so that only users in the same classroom VLAN can see their respective Apple TVs without broadcasting unnecessary traffic to other VLANs. Which configuration should the IT team implement?
- A
Enable mDNS Snooping and configure mDNS profiles with service policies.
- B
Enable multicast-to-unicast conversion on the wireless controllers.
- C
Disable mDNS on the wireless controllers and rely on Layer 3 routing.
- D
Use FlexConnect Local Switching mode to forward mDNS traffic.
Show answer and explanation
Correct answer: A
Explanation
To implement mDNS efficiently and restrict unnecessary traffic, enabling mDNS Snooping and configuring mDNS profiles with service policies is the best approach. This allows the IT team to control which mDNS services are advertised and ensure that only users on the same VLAN or defined group can discover the Apple TVs. Other options either fail to meet the requirements or are unrelated to mDNS traffic management.
- A. Correct.
Correct. mDNS Snooping on the wireless controllers allows the network to control which mDNS services are advertised and restricts mDNS traffic based on service policies. This ensures that only the devices in the same VLAN or defined policy can discover each other.
- B. Incorrect.
Incorrect. While multicast-to-unicast conversion can optimize multicast traffic, it does not provide the ability to restrict mDNS traffic to specific VLANs or service policies.
- C. Incorrect.
Incorrect. Disabling mDNS would prevent service discovery altogether, which contradicts the requirement to support Apple TV devices in the classrooms.
- D. Incorrect.
Incorrect. FlexConnect Local Switching mode is unrelated to mDNS service discovery or restricting mDNS traffic between VLANs.