LPI Exam 202-450 Topic 7 Question 110 Discussion

Actual exam question for LPI's 202-450 exam

Question #: 110
Topic #: 7

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

AAll traffic to localhost must always be allowed

BIt doesn't matter; netfilter never affects packets addressed to localhost

CSome applications use the localhost interface to communicate with other applications

Dsyslogd receives messages on localhost

EThe iptables command communicates with the netfilter management daemon netfilterd on localhost to create and change packet filter rules

Show Suggested Answer

Suggested Answer: C

by Elly at Apr 05, 2025, 09:33 AM

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Rosamond

23 days ago

B is just plain wrong. Of course netfilter affects localhost traffic, it's not some magical exception zone.

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Oretha

28 days ago

I think E is the funniest answer. Netfilterd is my new favorite daemon, sounds like a superhero!

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Elena

8 days ago

C) Some applications use the localhost interface to communicate with other applications

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Pamella

1 months ago

D is also a valid answer. The syslog daemon needs to receive messages on localhost to log system events.

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Quentin

9 days ago

E) The iptables command communicates with the netfilter management daemon netfilterd on localhost to create and change packet filter rules

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Elouise

16 days ago

C) Some applications use the localhost interface to communicate with other applications

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Graciela

2 months ago

But what about option B? Doesn't netfilter never affect packets addressed to localhost anyway?

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Eleonore

2 months ago

I agree with Josue. It's important to allow traffic to localhost for certain applications to function properly.

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Josue

2 months ago

I think a rule allowing traffic to localhost should exist because some applications use the localhost interface to communicate with other applications.

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Carey

2 months ago

C is the correct answer. Applications like database servers often use the localhost interface for internal communication, so a rule allowing this traffic is necessary.

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