Question 626 of 988

Cloud Security →hardMultiple 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.

A company is deploying a multi-tier application on AWS. The web servers must be accessible from the internet only on ports 80 and 443, while the database servers should be accessible only from the web servers on port 3306. Which combination of cloud network security controls should be used?

A
Only security groups for both tiers, no NACLs
Why wrong: NACLs are not required but can be used for additional filtering.
B
Only Network ACLs for both subnets, no security groups
Why wrong: NACLs are stateless and cannot replace security groups; both are used.
C
Security groups for each tier and a Network ACL on the database subnet
Security groups control instance-level traffic; NACLs add subnet-level filtering.
D
Network ACLs for the web tier and security groups for the database tier
Why wrong: This mixes controls incorrectly; both tiers can use security groups.

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 groups for each tier and a Network ACL on the database subnet

Security groups act as instance-level firewalls, allowing stateful filtering. NACLs are stateless and applied at the subnet level. Typically, security groups for each tier and NACLs for subnet-level filtering are used.

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.

✗
Only security groups for both tiers, no NACLs
Why it's wrong here
NACLs are not required but can be used for additional filtering.
✗
Only Network ACLs for both subnets, no security groups
Why it's wrong here
NACLs are stateless and cannot replace security groups; both are used.
✓
Security groups for each tier and a Network ACL on the database subnet
Why this is correct
Security groups control instance-level traffic; NACLs add subnet-level filtering.
Related concept
CIDR notation defines the prefix length.
✗
Network ACLs for the web tier and security groups for the database tier
Why it's wrong here
This mixes controls incorrectly; both tiers can use security groups.

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 groups for each tier and a Network ACL on the database subnet — Security groups act as instance-level firewalls, allowing stateful filtering. NACLs are stateless and applied at the subnet level. Typically, security groups for each tier and NACLs for subnet-level filtering are used.

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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