Question 200 of 988

Cloud Security →mediumMultiple ChoiceObjective-mapped

350-701 Cloud Security Practice Question

This 350-701 practice question tests your understanding of cloud security. 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.

In AWS, which resource acts as a stateful firewall at the instance level to control inbound and outbound traffic?

A
Network ACL
Why wrong: NACLs are stateless and operate at the subnet level.
B
Internet Gateway
Why wrong: An internet gateway enables VPC connectivity, not firewall.
C
VPC Flow Logs
Why wrong: Flow logs capture traffic metadata, not control traffic.
D
Security Group
Security groups are stateful instance-level firewalls.

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

✓

Security Group

Security groups in AWS are stateful firewalls that operate at the instance level, while NACLs are stateless at the subnet level.

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 ACL
Why it's wrong here
NACLs are stateless and operate at the subnet level.
✗
Internet Gateway
Why it's wrong here
An internet gateway enables VPC connectivity, not firewall.
✗
VPC Flow Logs
Why it's wrong here
Flow logs capture traffic metadata, not control traffic.
✓
Security Group
Why this is correct
Security groups are stateful instance-level firewalls.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement 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 350-701 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this 350-701 question test?

Cloud Security — This question tests Cloud Security — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Security Group — Security groups in AWS are stateful firewalls that operate at the instance level, while NACLs are stateless at the subnet level.

What should I do if I get this 350-701 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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Last reviewed: Jul 4, 2026

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