Wrong acronym in chapter 28: DNS

fabv

If name resolution cannot be done locally using the /etc/hosts file, then the system will query a DNS (Domain Name Server) server.

DNS stands for Domain Name System, not Server.
Sources (found from Wikipedia's entry on DNS):

• https://datatracker.ietf.org/doc/html/rfc1034

This RFC is an introduction to the Domain Name System (DNS)

• https://datatracker.ietf.org/doc/html/rfc9499 (most recent)

The Domain Name System (DNS) is a simple query-response protocol whose messages in both directions have the same format.

fcioanca

This has been corrected.

fabv

Thank you!