- A
Network ACLs
Why wrong: Network ACLs are stateless and applied per subnet; they do not provide a centralized dashboard for managing firewall rules across multiple VPCs.
- B
Security Groups
Why wrong: Security Groups are stateful and applied per ENI; they are not centralized and cannot manage rules across multiple VPCs.
- C
AWS WAF
Why wrong: AWS WAF is a web application firewall that protects against web exploits at the application layer, not a network firewall management service.
- D
AWS Network Firewall
AWS Network Firewall provides a centralized firewall management service with a dashboard to manage rules across multiple VPCs and on-premises networks.
Question 734 of 1,705
ANS-C01 Network Management and Operations Practice Question
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 needs to centrally manage network security policies across multiple VPCs and on-premises networks. Which AWS service provides a centralized dashboard for managing firewall rules?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Network Firewall
Option D is correct because AWS Network Firewall offers a centralized dashboard for managing network-level firewall rules across multiple VPCs and on-premises networks, with policy-based management. Option A is incorrect because Network ACLs are stateless, applied at the subnet level, and lack centralized management capabilities. Option B is incorrect because Security Groups are stateful, applied at the ENI level, and not designed for centralized cross-VPC management. Option C is incorrect because AWS WAF protects web applications at the application layer (HTTP/S), not network-layer firewall rules.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Network ACLs
Why it's wrong here
Network ACLs are stateless and applied per subnet; they do not provide a centralized dashboard for managing firewall rules across multiple VPCs.
- ✗
Security Groups
Why it's wrong here
Security Groups are stateful and applied per ENI; they are not centralized and cannot manage rules across multiple VPCs.
- ✗
AWS WAF
Why it's wrong here
AWS WAF is a web application firewall that protects against web exploits at the application layer, not a network firewall management service.
- ✓
AWS Network Firewall
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
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
How to think about this question
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.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
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
How this comes up in practice
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.
Visual reference
Quick reference
OSI Model Reference
| Layer | Name | PDU | Key Protocols / Devices |
|---|---|---|---|
| 7 | Application | Data | HTTP, HTTPS, DNS, SMTP, FTP, SSH |
| 6 | Presentation | Data | TLS / SSL, JPEG, ASCII encoding |
| 5 | Session | Data | NetBIOS, RPC, SIP |
| 4 | Transport | Segment / Datagram | TCP, UDP |
| 3 | Network | Packet | IP, ICMP, OSPF — Routers |
| 2 | Data Link | Frame | Ethernet, Wi-Fi, PPP — Switches, Bridges |
| 1 | Physical | Bits | Cables, NICs, Hubs, Repeaters |
What to study next
Got this wrong? Here's your next step.
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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Network Management and Operations — study guide chapter
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Management and Operations — This question tests Network Management and Operations — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: AWS Network Firewall — Option D is correct because AWS Network Firewall offers a centralized dashboard for managing network-level firewall rules across multiple VPCs and on-premises networks, with policy-based management. Option A is incorrect because Network ACLs are stateless, applied at the subnet level, and lack centralized management capabilities. Option B is incorrect because Security Groups are stateful, applied at the ENI level, and not designed for centralized cross-VPC management. Option C is incorrect because AWS WAF protects web applications at the application layer (HTTP/S), not network-layer firewall rules.
What should I do if I get this ANS-C01 question wrong?
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.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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