network – Possible Multicast Risks

I've noticed that an Android in my network is constantly connected to multicast DNS. I saw this because my firewall is blocking this incoming connection. Other devices also connect to this IP address, but this particular Android seems to do it all the time, and this user (my father) is not concerned with security.

I would like to know if this type of connection can spread an infection (if it exists), because my PC has a firewall, but not that of other androids (not rooted).