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LPI 202-450 Exam - Topic 7 Question 110 Discussion

When the default policy for the netfilter INPUT chain is set to DROP, why should a rule allowing traffic to localhost exist?
C) Some applications use the localhost interface to communicate with other applications
A) All traffic to localhost must always be allowed
B) It doesn't matter; netfilter never affects packets addressed to localhost
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

LPI 202-450 Exam - Topic 7 Question 110 Discussion

Actual exam question for LPI's 202-450 exam
Question #: 110
Topic #: 7
[All 202-450 Questions]

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

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Suggested Answer: C

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

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Gail
7 months ago
Some apps really do rely on localhost for communication.
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Ryan
7 months ago
Wait, I thought localhost was always open?
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Yuki
7 months ago
All traffic to localhost must always be allowed.
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Cherelle
7 months ago
Definitely need rules for localhost traffic!
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Kenia
7 months ago
I disagree, it can be managed differently.
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Mozell
8 months ago
I vaguely recall something about syslogd using localhost for messages, but I can't remember if that's the main reason we need to allow that traffic. Is that option D?
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Inocencia
8 months ago
I'm a bit confused; I thought netfilter didn't affect localhost at all, but maybe that's not correct? I should probably double-check that.
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Maryann
8 months ago
I feel like I saw a question similar to this in practice, and it was about how netfilter handles localhost traffic. I think it might be option C?
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Kaycee
8 months ago
I think I remember that localhost traffic needs to be allowed because some applications rely on it to communicate, but I'm not entirely sure which option that is.
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Tarra
9 months ago
The iptables command communicating with netfilterd on localhost - that's an interesting detail. I'll make sure to keep that in mind as I work through this question.
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Maurine
9 months ago
All traffic to localhost should always be allowed? That doesn't sound right to me. I'll need to read the question more closely and consider the other options.
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Alease
9 months ago
Okay, the key here is that some applications use localhost to communicate, so we need a rule to allow that traffic even with a DROP default policy. I think I've got a good strategy for this.
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Lasandra
9 months ago
Hmm, I'm a bit confused about the relationship between the default policy and localhost traffic. I'll need to think this through carefully.
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Nikita
9 months ago
This seems like a pretty straightforward question about netfilter and localhost traffic. I'm confident I can figure this out.
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Rosamond
1 year ago
B is just plain wrong. Of course netfilter affects localhost traffic, it's not some magical exception zone.
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Kristal
1 year ago
D) syslogd receives messages on localhost
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Fabiola
1 year ago
C) Some applications use the localhost interface to communicate with other applications
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Nobuko
1 year ago
A) All traffic to localhost must always be allowed
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Oretha
1 year ago
I think E is the funniest answer. Netfilterd is my new favorite daemon, sounds like a superhero!
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Rupert
1 year ago
D) syslogd receives messages on localhost
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Bong
1 year ago
A) All traffic to localhost must always be allowed
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Elena
1 year ago
C) Some applications use the localhost interface to communicate with other applications
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Pamella
1 year ago
D is also a valid answer. The syslog daemon needs to receive messages on localhost to log system events.
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Venita
1 year ago
D) syslogd receives messages on localhost
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Quentin
1 year 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
1 year ago
C) Some applications use the localhost interface to communicate with other applications
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Graciela
1 year ago
But what about option B? Doesn't netfilter never affect packets addressed to localhost anyway?
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Eleonore
1 year ago
I agree with Josue. It's important to allow traffic to localhost for certain applications to function properly.
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Josue
1 year 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
1 year 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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Erick
1 year ago
D) syslogd receives messages on localhost
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Luke
1 year ago
A) All traffic to localhost must always be allowed
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Tonette
1 year ago
C) Some applications use the localhost interface to communicate with other applications
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Lucina
1 year ago
D) syslogd receives messages on localhost
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Lawrence
1 year ago
A) All traffic to localhost must always be allowed
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Linwood
1 year ago
C) Some applications use the localhost interface to communicate with other applications
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