UDP ports used - Linux OS (Debian 12)

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1

I am using [Brave 1.79.118 on Debian 12 and I am seeing brave use UDP ports such as
41355
47198
49755
51712
5353 which is MDNS and I do not use and is blocked along with all the UDP ports yet brave keeps trying to communicate out . Why is this occurring ?

2

IIRC, there are 65535 ports for TCP protocol and 65535 ports for UDP protocol. Browser requests sent to DNS servers, typically use port 53 UDP, but some may use port 5353 UDP (MultiCast DNS); and there are other ports used for DNS.

Until 2023, I blocked a lot of the UDP traffic (I much preferred TCP traffic), but I found that more and more websites include UDP traffic.

Ref. material:

Wiki:
‘https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers’

From last year:
‘Brave (linux) makes constant UDP :443 connections to Google’