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Question 855 of 1,705

Network Management and Operations →easyMultiple ChoiceObjective-mapped

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 has a VPC with multiple subnets. They want to centrally manage and inspect all traffic between subnets using a security appliance. Which AWS service should be used to achieve this?

A
VPC peering
Why wrong: Not centralized.
B
AWS Route 53 Resolver
Why wrong: DNS only.
C
AWS Network Firewall
Why wrong: Can inspect traffic but Transit Gateway is the connectivity hub.
D
Transit Gateway with a security appliance in a central VPC
Allows centralized inspection.

Full breakdown with real-world context →

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

✓

Transit Gateway with a security appliance in a central VPC

Transit Gateway with a security appliance in a central VPC (Option D) is the correct approach because it allows centralized inspection of all traffic between subnets by routing traffic through a central inspection VPC where security appliances are deployed. Option A (VPC peering) is incorrect because it only provides direct connectivity between two VPCs and does not support centralized inspection. Option B (AWS Route 53 Resolver) is a DNS service and has no traffic inspection capability. Option C (AWS Network Firewall) is a managed firewall service, but it does not provide the multi-VPC architecture needed to centrally route traffic from multiple subnets/VPCs; Transit Gateway is required to route traffic to the firewall.

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.

✗
VPC peering
Why it's wrong here
Not centralized.
✗
AWS Route 53 Resolver
Why it's wrong here
DNS only.
✗
AWS Network Firewall
Why it's wrong here
Can inspect traffic but Transit Gateway is the connectivity hub.
✓
Transit Gateway with a security appliance in a central VPC
Why this is correct
Allows centralized inspection.
Related concept
CIDR notation defines the prefix length.

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

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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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: Transit Gateway with a security appliance in a central VPC — Transit Gateway with a security appliance in a central VPC (Option D) is the correct approach because it allows centralized inspection of all traffic between subnets by routing traffic through a central inspection VPC where security appliances are deployed. Option A (VPC peering) is incorrect because it only provides direct connectivity between two VPCs and does not support centralized inspection. Option B (AWS Route 53 Resolver) is a DNS service and has no traffic inspection capability. Option C (AWS Network Firewall) is a managed firewall service, but it does not provide the multi-VPC architecture needed to centrally route traffic from multiple subnets/VPCs; Transit Gateway is required to route traffic to the firewall.

What should I do if I get this ANS-C01 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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