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Question 510 of 1,000
Secure networking →mediumMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is that this NSG rule allows inbound SSH traffic from the 10.0.0.0/24 subnet to the 10.0.1.0/24 subnet. This is because the rule explicitly permits inbound TCP traffic on port 22, which is the default port for SSH, matching the source and destination ranges specified in the exhibit. On the Microsoft Azure Security Engineer Associate AZ-500 exam, questions about NSG rules often test your ability to read the rule’s direction, protocol, port, and IP ranges—common traps include confusing inbound with outbound or misreading the action as deny. A frequent memory tip is to remember that SSH always uses TCP port 22, and an NSG rule to allow inbound SSH must have the source as the initiating network and the destination as the protected subnet. To avoid errors, always check the priority and the action (Allow vs. Deny) before confirming the effect.

AZ-500 Secure networking Practice Question

This AZ-500 practice question tests your understanding of secure networking. 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.

Exhibit

{
  "name": "AllowSSHOnly",
  "properties": {
    "protocol": "Tcp",
    "sourcePortRange": "*",
    "destinationPortRange": "22",
    "sourceAddressPrefix": "10.0.0.0/24",
    "destinationAddressPrefix": "10.0.1.0/24",
    "access": "Allow",
    "priority": 100,
    "direction": "Inbound"
  }
}

Refer to the exhibit. You are reviewing an NSG rule configuration for a subnet. The source subnet is 10.0.0.0/24 and the destination subnet is 10.0.1.0/24. What is the effect of this rule?

Question 1mediummultiple choice
Read the full NAT/PAT explanation →

Exhibit

{
  "name": "AllowSSHOnly",
  "properties": {
    "protocol": "Tcp",
    "sourcePortRange": "*",
    "destinationPortRange": "22",
    "sourceAddressPrefix": "10.0.0.0/24",
    "destinationAddressPrefix": "10.0.1.0/24",
    "access": "Allow",
    "priority": 100,
    "direction": "Inbound"
  }
}

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

✓

Allows inbound SSH traffic from 10.0.0.0/24 to 10.0.1.0/24.

Option A is correct because the rule allows inbound TCP traffic on port 22 from source range 10.0.0.0/24 to destination range 10.0.1.0/24. Option B is wrong because the rule allows inbound, not outbound. Option C is wrong because the rule allows SSH, not blocks. Option D is wrong because the rule is specific to port 22.

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.

  • ✗

    Allows outbound SSH traffic from 10.0.1.0/24 to 10.0.0.0/24.

    Why it's wrong here

    The direction is inbound, not outbound.

  • ✗

    Blocks inbound SSH traffic from 10.0.0.0/24 to 10.0.1.0/24.

    Why it's wrong here

    The access is Allow, not Deny.

  • ✗

    Allows all inbound traffic from 10.0.0.0/24 to 10.0.1.0/24.

    Why it's wrong here

    Only port 22 is allowed, not all ports.

  • ✓

    Allows inbound SSH traffic from 10.0.0.0/24 to 10.0.1.0/24.

    Why this is correct

    The rule explicitly allows SSH from the source to the destination.

    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.

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 AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this AZ-500 question test?

Secure networking — This question tests Secure networking — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Allows inbound SSH traffic from 10.0.0.0/24 to 10.0.1.0/24. — Option A is correct because the rule allows inbound TCP traffic on port 22 from source range 10.0.0.0/24 to destination range 10.0.1.0/24. Option B is wrong because the rule allows inbound, not outbound. Option C is wrong because the rule allows SSH, not blocks. Option D is wrong because the rule is specific to port 22.

What should I do if I get this AZ-500 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 AZ-500 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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