Question 125 of 988

Cloud Security →hardMultiple ChoiceObjective-mapped

350-701 Cloud Security Practice Question

This 350-701 practice question tests your understanding of cloud security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 uses Azure NSGs to control traffic between subnets. They need to allow traffic from the frontend subnet to the backend subnet only on TCP 443. Which configuration correctly achieves this?

A
Outbound rule on frontend NSG allowing TCP 443 to backend subnet
Why wrong: This would allow outbound traffic but not guarantee inbound; NSGs are applied at subnet or NIC level; the backend subnet needs an inbound rule to allow the traffic.
B
Inbound rule on backend NSG allowing TCP 443 from frontend subnet
The stateful NSG automatically allows return traffic.
C
Outbound rule on frontend NSG allowing TCP 443 to backend subnet; inbound rule on backend NSG allowing TCP 443 from frontend subnet
Why wrong: This is redundant because NSGs are stateful; only one direction is needed.
D
Inbound rule on frontend NSG allowing TCP 443 from backend subnet
Why wrong: This is the opposite direction.

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

✓

Inbound rule on backend NSG allowing TCP 443 from frontend subnet

NSGs are stateful; an inbound rule on the backend subnet allowing TCP 443 from frontend subnet is sufficient. Outbound rules are not needed because stateful filtering allows return traffic.

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.

✗
Outbound rule on frontend NSG allowing TCP 443 to backend subnet
Why it's wrong here
This would allow outbound traffic but not guarantee inbound; NSGs are applied at subnet or NIC level; the backend subnet needs an inbound rule to allow the traffic.
✓
Inbound rule on backend NSG allowing TCP 443 from frontend subnet
Why this is correct
The stateful NSG automatically allows return traffic.
Related concept
CIDR notation defines the prefix length.
✗
Outbound rule on frontend NSG allowing TCP 443 to backend subnet; inbound rule on backend NSG allowing TCP 443 from frontend subnet
Why it's wrong here
This is redundant because NSGs are stateful; only one direction is needed.
✗
Inbound rule on frontend NSG allowing TCP 443 from backend subnet
Why it's wrong here
This is the opposite direction.

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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.

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: Inbound rule on backend NSG allowing TCP 443 from frontend subnet — NSGs are stateful; an inbound rule on the backend subnet allowing TCP 443 from frontend subnet is sufficient. Outbound rules are not needed because stateful filtering allows return traffic.

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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