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Respond to security incidents →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is that this Azure WAF rule blocks traffic originating from IP address 10.0.0.1. The JSON snippet defines a custom rule using a match condition that checks the remote IP address against the specific value '10.0.0.1', and the action field is explicitly set to 'Block', which instructs the Web Application Firewall to deny any matching requests. On the SC-200 exam, this tests your ability to interpret Azure WAF rule structures, particularly the distinction between matching a single IP versus a range, and recognizing that the action parameter—not the condition—determines whether traffic is allowed or blocked. A common trap is confusing the 'Block' action with 'Allow' or misreading the IP value as a range when it lacks a subnet mask. Remember the memory tip: "One IP, one block—no slash, no range."

SC-200 Respond to security incidents Practice Question

This SC-200 practice question tests your understanding of respond to security incidents. 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.

Exhibit

Refer to the exhibit.
```json
{
  "displayName": "Malicious IP Block Rule",
  "properties": {
    "rules": [
      {
        "name": "BlockMaliciousIP",
        "matchConditions": [
          {
            "matchVariable": "RemoteAddr",
            "operator": "IPMatch",
            "matchValue": "10.0.0.1"
          }
        ],
        "action": {
          "type": "Block"
        }
      }
    ]
  }
}
```

Refer to the exhibit. This JSON snippet is from an Azure Web Application Firewall (WAF) policy. What does this rule do?

Question 1hardmultiple choice
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Exhibit

Refer to the exhibit.
```json
{
  "displayName": "Malicious IP Block Rule",
  "properties": {
    "rules": [
      {
        "name": "BlockMaliciousIP",
        "matchConditions": [
          {
            "matchVariable": "RemoteAddr",
            "operator": "IPMatch",
            "matchValue": "10.0.0.1"
          }
        ],
        "action": {
          "type": "Block"
        }
      }
    ]
  }
}
```

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

✓

Blocks traffic originating from IP address 10.0.0.1.

Option B is correct. The rule matches the remote IP address '10.0.0.1' and blocks the request. Option A is wrong because it matches a specific IP, not a range. Option C is wrong because the action is 'Block'. Option D is wrong because it does not allow.

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.

  • ✗

    Blocks traffic from the entire 10.0.0.0/24 subnet.

    Why it's wrong here

    The match value is a single IP, not a subnet.

  • ✓

    Blocks traffic originating from IP address 10.0.0.1.

    Why this is correct

    The rule matches RemoteAddr with IPMatch operator for '10.0.0.1' and blocks it.

    Related concept

    CIDR notation defines the prefix length.

  • ✗

    Logs traffic from IP address 10.0.0.1 without blocking.

    Why it's wrong here

    The action is 'Block', not 'Log'.

  • ✗

    Allows traffic from IP address 10.0.0.1.

    Why it's wrong here

    The action type is 'Block', not 'Allow'.

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 SC-200 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this SC-200 question test?

Respond to security incidents — This question tests Respond to security incidents — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Blocks traffic originating from IP address 10.0.0.1. — Option B is correct. The rule matches the remote IP address '10.0.0.1' and blocks the request. Option A is wrong because it matches a specific IP, not a range. Option C is wrong because the action is 'Block'. Option D is wrong because it does not allow.

What should I do if I get this SC-200 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 SC-200 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 21, 2026

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