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When the default policy for the netfilter INPUT chain is set to DROP, why should a rule allowing traffic to localhost exist?

When the default policy for the netfilter INPUT chain is set to DROP, why should a rule allowing traffic to localhost exist?
A . All traffic to localhost must always be allowed
B . It doesn’t matter; netfilter never affects packets addressed to localhost
C . Some applications use the localhost interface to communicate with other applications
D . syslogd receives messages on localhost
E . The iptables command communicates with the netfilter management daemon netfilterd on localhost to create and change packet filter rules

Answer: C

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