Secure and harden the System Configuration File nsswitch.conf Also optimized it to perform DNS lookups more efficiently.

# nano /etc/nsswitch.conf

hosts:                files
passwd:            files
shadow:            files
group:               files
services:           files
networks:         files
protocols:         files
rpc:                   files
ethers:              files
netmasks:        files
bootparams:    files
automount:     files
aliases:             files

Now type Ctrl+X then hit Y and enter

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