This lesson covers DNS.

Objectives and Skills

Objectives and skills for the DNS portion of Linux+ certification include:^[1]

• Configure client-side DNS
  • Query remote DNS servers
  • Configure local name resolution and use remote DNS servers
  • Modify the order in which name resolution is done
  • The following is a partial list of the used files, terms and utilities:
    • Files:
      • /etc/hosts
      • /etc/resolv.conf
      • /etc/systemd/resolved.conf
      • /etc/nsswitch.conf
      • /etc/network/interfaces^[2][3]
    • Utilities:
      • host
      • dig
      • getent
      • nslookup
      • systemd-resolve^[4]
      • netplan

Readings

Multimedia

Activities

1. Display your DNS configuration in macOS running: scutil --dns

Lesson Summary

Key Terms

See also

• scutil (command) (macOS): scutil --dns show DNS configuration
• resolved.conf (Systemd)^[5]
• w:Dnsmasq

References