Exam XK0-004 topic 1 question 207 discussion

Correct Answer C. /etc/nsswitch.conf Linux Changing DNS Search Order Under Linux you need to use /etc/nsswitch.conf file which is used by system databases and Name Service Switch configuration file. Open /etc/nsswitch.conf file using text editor: # vi /etc/nsswitch.conf Look for hosts: hosts: files dns mdns4 Set above order as per your requirement. Close and save the file.

we can configure /etc/nsswitch.conf to define if we are going to use a static file like /etc/hosts to resolve names first, a DNS resolver as a second choice and even maybe a NIS server as a third.

Personally, the way I've always done it (RHEL, OEL, CentOS) is IF I wanted to change the domain search order, that's /etc/resolv.conf IF I wanted to make sure it reads the /etc/hosts file FIRST before DNS, then that's /etc/nsswitch.conf Just my $.02

The /etc/nsswitch.conf file defines the order in which the system searches for a hostname, not the list of DNS servers used. So C is correct

The referenced url doesn't show how to change the DNS domain search order. It shows how to configure the different resources we have in a Linux server to resolve name. Yes, we can configure /etc/nsswitch.conf to define if we are going to use a static file like /etc/hosts to resolve names first, a DNS resolver as a second choice and even maybe a NIS server as a third. But that is not a proper answer for the question. Rigth answer is "A". You can change the domain search order for DNS, just reordering the "domain" entries in /etc/resolv.conf.