This ANS-C01 practice question tests your understanding of network management and operations. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a VPC with both IPv4 and IPv6 CIDR blocks. The network engineer needs to capture all traffic between the VPC and the internet. Which THREE resources must have VPC Flow Logs enabled?
Internet gateway
The internet gateway's ENI captures traffic to/from the internet.
NAT gateway
NAT gateway's ENI captures IPv4 traffic from private subnets.
Subnet
Why wrong: Subnets do not have network interfaces for flow logs.
VPC
Why wrong: Flow logs are enabled on network interfaces, not the VPC directly.
Egress-only internet gateway
Egress-only internet gateway handles IPv6 traffic to the internet.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Internet gateway
Option B is correct because the internet gateway (igw) is the attachment point to the internet. Option D is correct because egress-only internet gateway handles IPv6 traffic. Option E is correct because the NAT gateway handles IPv4 traffic from private subnets. Option A is incorrect because VPC itself does not have flow logs; they are on network interfaces. Option C is incorrect because subnets do not have flow logs directly.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Internet gateway
NAT gateway
Subnet
Why it's wrong here
Subnets do not have network interfaces for flow logs.
VPC
Why it's wrong here
Flow logs are enabled on network interfaces, not the VPC directly.
Egress-only internet gateway
Common exam traps
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Network Management and Operations — This question tests Network Management and Operations — CIDR notation defines the prefix length..
The correct answer is: Internet gateway — Option B is correct because the internet gateway (igw) is the attachment point to the internet. Option D is correct because egress-only internet gateway handles IPv6 traffic. Option E is correct because the NAT gateway handles IPv4 traffic from private subnets. Option A is incorrect because VPC itself does not have flow logs; they are on network interfaces. Option C is incorrect because subnets do not have flow logs directly.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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