Courseiva
← DP-900
Full test
Question 826 of 982
Identify considerations for relational data on Azure →easyMultiple ChoiceObjective-mapped

DP-900 Practice Question: Identify considerations for relational data on Azure

This DP-900 practice question tests your understanding of identify considerations for relational data on azure. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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
{
  "properties": {
    "firewallRules": [
      {
        "startIpAddress": "10.0.0.0",
        "endIpAddress": "10.0.0.0"
      },
      {
        "startIpAddress": "192.168.1.0",
        "endIpAddress": "192.168.1.255"
      }
    ]
  }
}
```

The exhibit shows a firewall rule configuration for an Azure SQL Server. A developer reports that a client app running on IP 10.0.0.5 cannot connect to the database. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

  • Clue: "most likely"

    Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1easymultiple choice
Full question →

Exhibit

Refer to the exhibit.

```json
{
  "properties": {
    "firewallRules": [
      {
        "startIpAddress": "10.0.0.0",
        "endIpAddress": "10.0.0.0"
      },
      {
        "startIpAddress": "192.168.1.0",
        "endIpAddress": "192.168.1.255"
      }
    ]
  }
}
```

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

✓

The first rule only allows a single IP (10.0.0.0), not the entire subnet

Option B is correct because the first rule allows only IP 10.0.0.0 (single IP), not the subnet. Option A is wrong because Azure SQL supports both IPv4 and IPv6. Option C is wrong because the rules are valid JSON. Option D is wrong because the client IP is within the 192.168.1.0/24 range but the first rule is more restrictive.

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.

  • ✗

    The firewall rules are not in valid JSON format

    Why it's wrong here

    The JSON is valid.

  • ✓

    The first rule only allows a single IP (10.0.0.0), not the entire subnet

    Why this is correct

    The first rule specifies start and end IP both 10.0.0.0, so only that exact IP is allowed; 10.0.0.5 is blocked.

    Clue confirmation

    The clue word "most likely" in the question point toward this answer.

    Related concept

    CIDR notation defines the prefix length.

  • ✗

    The second rule overrides the first rule

    Why it's wrong here

    Firewall rules are additive; the second rule allows 192.168.1.0/24, but the client IP 10.0.0.5 is not in that range.

  • ✗

    The firewall rule uses IPv4 addresses, but the client is using IPv6

    Why it's wrong here

    Azure SQL supports both IPv4 and IPv6; the rule is IPv4 but the client could still connect if IPv4 is used.

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 DP-900 subnetting questions on CIDR, address ranges, and subnet selection.

Related practice questions

Related DP-900 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Describe core data concepts practice questions

Practise DP-900 questions linked to Describe core data concepts.

Describe an analytics workload on Azure practice questions

Practise DP-900 questions linked to Describe an analytics workload on Azure.

Identify considerations for relational data on Azure practice questions

Practise DP-900 questions linked to Identify considerations for relational data on Azure.

Describe considerations for working with non-relational data on Azure practice questions

Practise DP-900 questions linked to Describe considerations for working with non-relational data on Azure.

DP-900 fundamentals practice questions

Practise DP-900 questions linked to DP-900 fundamentals.

DP-900 scenario practice questions

Practise DP-900 questions linked to DP-900 scenario.

DP-900 troubleshooting practice questions

Practise DP-900 questions linked to DP-900 troubleshooting.

Practice this exam

Start a free DP-900 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions20 questions30 questions50 questionsTimed 30
DP-900 practice-test guide →Study guide →Browse all practice tests

FAQ

Questions learners often ask

What does this DP-900 question test?

Identify considerations for relational data on Azure — This question tests Identify considerations for relational data on Azure — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: The first rule only allows a single IP (10.0.0.0), not the entire subnet — Option B is correct because the first rule allows only IP 10.0.0.0 (single IP), not the subnet. Option A is wrong because Azure SQL supports both IPv4 and IPv6. Option C is wrong because the rules are valid JSON. Option D is wrong because the client IP is within the 192.168.1.0/24 range but the first rule is more restrictive.

What should I do if I get this DP-900 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 DP-900 subnetting questions on CIDR, address ranges, and subnet selection.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

CIDR notation defines the prefix length.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Last reviewed: Jun 20, 2026

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

Sign in to join the discussion.

This DP-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DP-900 exam.