300-425 Question 83
Select 3You are designing a wireless network for an office environment that heavily relies on Apple AirPlay and Bonjour services for device discovery and communication. To optimize these services across multiple subnets, you plan to implement mDNS on your Cisco wireless infrastructure. Which steps should you take to ensure successful configuration and operation of mDNS in this environment?
- A
Enable mDNS Snooping on the Wireless LAN Controller (WLC).
- B
Ensure that client devices and Bonjour-capable services are on the same VLAN.
- C
Create and define an mDNS Service Policy on the WLC to specify which services are advertised.
- D
Configure multicast forwarding on the network and ensure that IGMP Snooping is disabled.
- E
Enable multicast-multicast mode on the WLC and configure multicast group addresses.
Show answer and explanation
Correct answers: A, C, E
Explanation
To implement mDNS in a Cisco wireless network, you need to enable mDNS Snooping to allow the WLC to process mDNS packets, define a service policy to manage which services are advertised, and configure multicast-multicast mode with proper multicast group addresses for seamless communication across VLANs. These steps ensure that Bonjour services like AirPlay function correctly in a multi-subnet environment while optimizing network traffic.
- A. Correct.
Enabling mDNS Snooping on the WLC is essential for identifying and managing Bonjour service advertisements across VLANs. This step ensures the WLC can intercept and forward mDNS packets.
- B. Incorrect.
This is incorrect because mDNS is specifically designed to allow service discovery across VLANs. Keeping devices on the same VLAN is not a requirement when mDNS is implemented properly.
- C. Correct.
Defining an mDNS Service Policy on the WLC allows you to control which Bonjour services are advertised and forwarded, ensuring only relevant services are accessible.
- D. Incorrect.
This is incorrect because IGMP Snooping should be enabled to optimize multicast traffic and prevent unnecessary flooding. Disabling IGMP Snooping would lead to network inefficiencies.
- E. Correct.
Enabling multicast-multicast mode on the WLC ensures that mDNS traffic is forwarded properly using multicast, and configuring multicast group addresses ensures seamless communication across subnets.