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Huawei H12-811_V1.0 Exam - Topic 2 Question 85 Discussion

Which of the following configurations can prevent Host A and Host B from communicating with each other?
A) acl number 2000 rule 5 deny source 100.0.12.0 0.0.0.255 interface GigabitEthernet0/0/1 traffic-filter inbound acl 2000 and B) acl number 2000 rule 5 deny source 100.0.12.0 0.0.0.255 interface GigabitEthernet0/0/2 traffic-filter inbound acl 2000
C) acl number 2000 rule 5 deny source 100.0.12.0 0.0.0.255 interface GigabitEthernet0/0/3 traffic-filter inbound acl 2000
D) acl number 2000 rule 5 deny source 100.0.12.0 0.0.0.255 interface GigabitEthernet0/0/1 traffic-filter outbound acl 2000

Huawei H12-811_V1.0 Exam - Topic 2 Question 85 Discussion

Actual exam question for Huawei's H12-811_V1.0 exam
Question #: 85
Topic #: 2
[All H12-811_V1.0 Questions]

Which of the following configurations can prevent Host A and Host B from communicating with each other?

Show Suggested Answer Hide Answer
Suggested Answer: A, B

1. Understanding the ACL Rule

The rule:

rule 5 deny source 100.0.12.0 0.0.0.255

Blocks traffic originating from 100.0.12.0/24 (Host B's network).

This means any packet sent from Host B to Host A will be blocked.

2. Applying the ACL to the Correct Interfaces

Option A: Applied inbound on GE0/0/1 Blocks packets from Host B before reaching Host A.

Option B: Applied inbound on GE0/0/2 Blocks packets from Host A before reaching Host B.

3. Why Other Options Are Incorrect

Option C (GigabitEthernet0/0/3):

Interface GE0/0/3 is not connected to Host A or Host B, so applying ACL here is meaningless.

Option D (Outbound on GE0/0/1):

Outbound filtering is less efficient than inbound filtering because it blocks traffic after routing.

4. Correct Approach to Prevent Communication

To completely block communication between Host A and Host B, we must: Block inbound traffic on GE0/0/1 (Host A's interface) Block inbound traffic on GE0/0/2 (Host B's interface)

Conclusion:

The correct choices are A and B because they block inbound traffic at the correct interfaces.

Options C and D are incorrect because they apply ACL rules to the wrong interfaces or use inefficient filtering.

Reference: HCIA-Datacom V1.0 Certification Guide, Chapter 5: ACL Configuration


by Carma at Jul 13, 2025, 01:08 PM

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Isadora
7 months ago
C looks like it could work too.
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Karrie
7 months ago
I think B is the right answer!
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Paz
7 months ago
Option A will block communication for sure.
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Enola
7 months ago
Totally agree with A, it’s a solid block!
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Johnetta
7 months ago
Wait, can D really stop them? Seems off.
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Ula
8 months ago
I’m confused about the difference between inbound and outbound. I thought both A and D could potentially block communication, but I’m leaning towards A.
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Nettie
8 months ago
I practiced a similar question, and I feel like the interface matters a lot. Could it be option B since it’s on a different interface?
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Rosann
8 months ago
I'm not entirely sure, but I remember something about outbound filters being less effective. Maybe option D could work too?
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Erin
8 months ago
I think option A might be the right choice since it applies the ACL inbound on the interface where Host A is connected.
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Nadine
9 months ago
This is a good one. I'll methodically go through each option, visualizing the network topology and thinking about the traffic flow to determine which configuration will effectively block the communication.
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Rashad
9 months ago
I'm a little confused by the different interface options. I'll need to make sure I understand how the ACL is being applied on each interface and how that would impact the communication between the hosts.
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Amie
9 months ago
Okay, I think I've got this. The key is to look at the interface where the ACL is applied. Option D applies the ACL to the outbound traffic, which should block Host A and Host B from communicating.
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Sheron
9 months ago
Hmm, I'm a bit unsure about this one. The configurations seem similar, so I'll need to pay close attention to the details to determine which one will actually prevent the hosts from communicating.
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Carry
9 months ago
This looks like a classic access control list (ACL) configuration question. I'll need to carefully analyze the options and think about where the ACL is applied to block the communication.
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Sherell
11 months ago
I see your point, Cora. So, A is the correct answer then.
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Cora
11 months ago
But if the traffic-filter is inbound, wouldn't that prevent communication?
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Dorothy
11 months ago
I'm going to have to go with option D, just because I have a hunch the exam writers are trying to throw us a curveball. You know, keep us on our toes and all that. Plus, who doesn't love a good plot twist?
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Harrison
10 months ago
I think option D is the right choice too. Can't be too careful with those exam questions.
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Lacresha
11 months ago
Option A, no doubt about it. Configuring the ACL on the right interface is the key to preventing those pesky hosts from talking to each other. This is like networking 101, folks!
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Claudia
10 months ago
A) acl number 2000 rule 5 deny source 100.0.12.0 0.0.0.255 interface GigabitEthernet0/0/1 traffic-filter inbound acl 2000
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Matthew
11 months ago
This question is a real brain-teaser! I'm going to go with C, just because it's the middle option. That's how I usually pick my answers on multiple-choice exams.
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Marguerita
11 months ago
Hmm, I'm not too sure about this one. All the options look similar, but I'll go with B just to be different. Who knows, maybe the exam writers are trying to trick us!
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Ma
10 months ago
User2: I'm going with C, it seems like the best choice.
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Rikki
11 months ago
User1: I think the correct answer is A.
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Gayla
11 months ago
I disagree, I believe it's B.
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Cora
12 months ago
I think the correct answer is A.
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Theresia
12 months ago
This is a tricky one, but I think option D is the way to go. Filtering the outbound traffic on the interface seems like the best way to block communication between the hosts.
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Jacob
12 months ago
Option A looks like the correct answer. Applying the ACL to the inbound traffic on the interface connecting to Host A should prevent communication with Host B.
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Page
11 months ago
Yes, option A is the best choice. It will restrict the traffic from Host A to Host B.
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Marge
11 months ago
I agree, option A is the correct answer. It will block communication between Host A and Host B.
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