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GIAC GCFR Exam - Topic 6 Question 51 Discussion

An engineer is troubleshooting a complaint that a web server in AWS cannot receive incoming traffic, but the server can connect to the internet otherwise. What is needed to solve this problem?
C) Network Security Group
A) VPC Subnet
B) NAT Gateway
D) Internet Gateway

GIAC GCFR Exam - Topic 6 Question 51 Discussion

Actual exam question for GIAC's GCFR exam
Question #: 51
Topic #: 6
[All GCFR Questions]

An engineer is troubleshooting a complaint that a web server in AWS cannot receive incoming traffic, but the server can connect to the internet otherwise. What is needed to solve this problem?

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Suggested Answer: C

by Curtis at Jan 05, 2026, 05:16 AM

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Ezekiel
4 months ago
I’m leaning towards A) VPC Subnet. Maybe it's misconfigured.
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Micaela
4 months ago
True, but if the server connects fine, it’s likely a security group issue.
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Graciela
4 months ago
I agree, but what about D) Internet Gateway? It’s essential for public access.
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Billi
4 months ago
I think it's C) Network Security Group. It controls inbound traffic.
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Mitsue
4 months ago
Isn't the VPC Subnet also a factor here?
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Rosendo
4 months ago
Not sure about that, NAT Gateway could also be involved.
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Melvin
5 months ago
Surprised this is even a question, it's probably the security group!
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Brande
5 months ago
I think an Internet Gateway is essential for incoming traffic.
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Gilma
5 months ago
Definitely check the Network Security Group settings.
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Albina
5 months ago
B) NAT Gateway is the way to go. It's like a personal bodyguard for your web server, making sure it can access the internet safely.
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Blair
5 months ago
D) Internet Gateway, of course! How else is the web server going to get its daily dose of cat videos?
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Brinda
5 months ago
A) VPC Subnet is the answer. The web server must be in the right subnet to receive incoming traffic.
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Marcelle
6 months ago
C) Network Security Group is the solution. You need to ensure the security rules are properly configured to allow incoming traffic to the web server.
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Krissy
6 months ago
B) NAT Gateway is the way to go. It provides a secure way for the web server to access the internet, which is essential for troubleshooting the issue.
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Gracia
6 months ago
D) Internet Gateway is the correct answer. The issue is likely with the internet connectivity, so an Internet Gateway is needed to allow the web server to receive incoming traffic.
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Carli
7 months ago
I definitely recall that VPC Subnet settings can affect traffic, but I’m leaning towards the Internet Gateway being the key here.
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Hassie
7 months ago
NAT Gateway seems like it could be relevant, but I feel like it’s more for outbound traffic. I’m a bit confused.
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Karl
7 months ago
I remember practicing a similar question where the Internet Gateway was crucial for incoming traffic. Could that be the answer here?
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Dong
7 months ago
I think the issue might be related to the Network Security Group, but I'm not entirely sure how to check the inbound rules.
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Antione
7 months ago
Hmm, this is a tough one. I'm not totally sure, but I'm thinking it might have to do with the network security group or the NAT gateway. I'll need to review my notes on AWS networking to see if I can figure this out.
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Mayra
7 months ago
I've seen issues like this before, and my first thought is that it's probably an issue with the network configuration. I'm leaning towards the internet gateway as the solution, since that's what controls the flow of traffic in and out of the VPC.
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Adelle
8 months ago
Okay, let's see. If the server can connect to the internet, then the issue is probably with how it's receiving incoming traffic. I'm guessing it has to do with the network setup, so I'd lean towards either the VPC subnet or the internet gateway as the solution.
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Rodrigo
8 months ago
Hmm, this seems tricky. I'm not totally sure what the right answer is, but I'm thinking it might have to do with the network configuration and how the server is set up to handle incoming requests. I'll need to think this through carefully.
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Crista
8 months ago
I think the key here is to look at the connectivity of the web server. Since it can connect to the internet, the issue is likely with how it's receiving incoming traffic, so I'd focus on options related to that.
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Von
2 months ago
Or maybe the Internet Gateway isn't set up correctly.
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Janine
2 months ago
Definitely! The Network Security Group could be blocking traffic.
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Laura
2 months ago
I agree, it sounds like a connectivity issue.
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