DNS Port Question

[gsmonk]

DNS Port is 53, but is it tcp or udp?

Thanks,
Greg

[maine]

DNS uses UDP as a transport protocol, for the most part. The exceptions are zone transfers and very large responses, which use TCP. If you aren't running a DNS server udp 53 should do.

[gsmonk]

Thanks for the reponse, here is another one.

What about POP3 and SMTP, do they use TCP or UDP? or both?

Thanks,
Greg

[maine]

POP tcp 110 and SMTP 25 tcp