DNS server settings

RouterOS Beginner Basics
1

I have on my mikrotik setup dns server but in new 6.38v is more settings in dns tab. Can anybody tell what is ideal settings for dns server?
I have this one
servers: 8.8.8.8,8.8.4.4,4.2.2.2,4.2.2.4
dynamic-servers:
allow-remote-requests: yes
max-udp-packet-size: 4096
query-server-timeout: 2s
query-total-timeout: 10s
max-concurrent-queries: 100
max-concurrent-tcp-sessions: 20
cache-size: 2048KiB
cache-max-ttl: 2w
cache-used: 397KiB

What is best setting for new max-concurrent-queries and max-concurrent-tcp-sessions

2

Hi, how are you?
This limit depends on the size of your network and the capacity of your RB.
You can increase and monitor to see the best option that meets your need.

ate breve,
https://goo.gl/t5Wc1g

3

for a small network (about 40 PCs) what do you suggest?

dynamic-servers:
allow-remote-requests: yes
max-udp-packet-size: 2048
query-server-timeout: 1s
query-total-timeout: 2s
max-concurrent-queries: 200
max-concurrent-tcp-sessions: 50
cache-size: 1024KiB
cache-max-ttl: 1w
cache-used: 520KiB

4

for a small network (about 40 PCs) what do you suggest?

dynamic-servers:
allow-remote-requests: yes
max-udp-packet-size: 2048
query-server-timeout: 1s
query-total-timeout: 2s
max-concurrent-queries: 200
max-concurrent-tcp-sessions: 50
cache-size: 1024KiB
cache-max-ttl: 1w
cache-used: 520KiB