C E ARE CORRECT
https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/multicast_broadcast_setup.html
Restrictions for Configuring Multicast DNS
mDNS over IPv6 is not supported.
mDNS snooping is not supported on access points in FlexConnect mode in a locally switched WLAN and mesh access points. For locally switched WLANs, all multicast traffic including mDNS is simply bridged between the local VLAN and the SSID.
Agreed, we also have the first introduction on mDNS on the release 7.4; Support for the Multicast DNS (mDNS) protocol is introduced. Check older release if you need; https://www.cisco.com/c/en/us/td/docs/wireless/controller/release/notes/crn74.html
When configuring mDNS (Multicast DNS), the following restrictions apply:
C. mDNS is not supported on FlexConnect APs with a locally switched WLAN:
mDNS is not supported on FlexConnect APs when the WLAN is configured for local switching. This is because mDNS relies on centralized processing on the Wireless LAN Controller (WLC), and local switching bypasses the WLC.
E. mDNS is not supported over IPv6:
mDNS is designed to work with IPv4 and is not supported over IPv6. If the network uses IPv6, mDNS will not function.
Cisco AireOS feature guide states mDNS first supported in 7.4.100, there is no reference to a version 7.0.6, https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/201007-AireOS-feature-list-per-release.html#toc-hId--408070459. IPv6 is now supported but this question may have been written years ago and no one's updated...
Bonjour protocol is an Apple service discovery protocol which locates devices and sevices on a local network with the use of multicast Domain Name System (mDNS) service records. The Bonjour protocol operates on service announcements and service queries. Each query or advertisement is sent to the Bonjour multicast address ipv4 224.0.0.251 (ipv6 FF02::FB). This protocal uses mDNS on UDP port 5353.
https://www.cisco.com/c/en/us/support/docs/wireless/wireless-lan-controller-software/210835-Troubleshooting-mDNS.html
C & D are the best Answer
C & D is correct.
mDNS gateway supports both IPv4 and IPv6 records and transports
https://www.cisco.com/c/dam/en/us/td/docs/wireless/controller/9800/17-3/deployment-guide/c9800-mDNS-technical-guide-rel-17-3.pdf
Restrictions for Configuring Multicast DNS
mDNS over IPv6 is not supported.
mDNS snooping is not supported on access points in FlexConnect mode in a locally switched WLAN and mesh access points. For locally switched WLANs, all multicast traffic including mDNS is simply bridged between the local VLAN and the SSID.
https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-6/configuration-guide/b_cg76/b_cg76_chapter_01011.html
As per the new 300-430 guide page 295 To configure an AireOS controller to participate in mDNS, navigate to CONTROLLER >
mDNS > General and then check the box next to mDNS Global Snooping to enable it, as
shown in Figure 12-16. For an IOS-XE controller, go to Configuration > Services > mDNS
Gateway and select Transport. Then choose ipv4, ipv6, or both, and click Apply.
Answer is C and E.
Restrictions for Configuring Multicast DNS
mDNS over IPv6 is not supported.
mDNS snooping is not supported on access points in FlexConnect mode in a locally switched WLAN and mesh access points. For locally switched WLANs, all multicast traffic including mDNS is simply bridged between the local VLAN and the SSID.
C & D are correct
-IPv6 is supported (ruled out)
-mDNS use 5353 port (a & b are ruled out)
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