How to add a third DNS server on Red Hat Enterprise Linux (RHEL)?

Solution Verified - Updated -

Issue

  • 3rd DNS server cannot be added to /etc/sysconfig/network-scripts/ifcfg-ethX.
  • How to add several DNS servers?

Environment

  • Red Hat Enterprise Linux (RHEL):
    • 4.X
    • 5.X
    • 6.X
    • 7.X

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