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Implement Azure security →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is that there is no rule to allow HTTPS traffic from the internet, making the current NSG configuration incomplete. This is because network security groups process rules in priority order, and the existing DenyAll rule at the lowest priority will block all inbound traffic that does not match a higher-priority allow rule. Since the only allow rule permits SSH on port 22 from the VirtualNetwork, any HTTPS request on port 443 from the internet is implicitly denied by the default DenyAll rule. On the Microsoft Azure Developer Associate AZ-204 exam, this scenario tests your understanding of NSG rule evaluation logic and the common trap of assuming a default allow exists for common protocols like HTTPS. A frequent mistake is thinking the DenyAll rule is misconfigured, when in fact the issue is the absence of a specific allow rule for port 443 over the Internet source. Remember the memory tip: “No allow, no flow” — without an explicit inbound allow rule for your application port, the default deny will always block traffic from the internet.

AZ-204 Implement Azure security Practice Question

This AZ-204 practice question tests your understanding of implement azure security. 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.
{
  "type": "Microsoft.Network/networkSecurityGroups",
  "apiVersion": "2023-11-01",
  "name": "nsg-app",
  "properties": {
    "securityRules": [
      {
        "name": "AllowSSH",
        "properties": {
          "protocol": "Tcp",
          "sourcePortRange": "*",
          "destinationPortRange": "22",
          "sourceAddressPrefix": "VirtualNetwork",
          "destinationAddressPrefix": "*",
          "access": "Allow",
          "priority": 100,
          "direction": "Inbound"
        }
      },
      {
        "name": "DenyAll",
        "properties": {
          "protocol": "*",
          "sourcePortRange": "*",
          "destinationPortRange": "*",
          "sourceAddressPrefix": "*",
          "destinationAddressPrefix": "*",
          "access": "Deny",
          "priority": 200,
          "direction": "Inbound"
        }
      }
    ]
  }
}

You are reviewing an ARM template that deploys a network security group (NSG) for a web application. The exhibit shows the security rules. The web application runs on port 443. You need to ensure that HTTPS traffic from the internet can reach the web servers. What is the issue with the current configuration?

Question 1hardmultiple choice
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Exhibit

Refer to the exhibit.
{
  "type": "Microsoft.Network/networkSecurityGroups",
  "apiVersion": "2023-11-01",
  "name": "nsg-app",
  "properties": {
    "securityRules": [
      {
        "name": "AllowSSH",
        "properties": {
          "protocol": "Tcp",
          "sourcePortRange": "*",
          "destinationPortRange": "22",
          "sourceAddressPrefix": "VirtualNetwork",
          "destinationAddressPrefix": "*",
          "access": "Allow",
          "priority": 100,
          "direction": "Inbound"
        }
      },
      {
        "name": "DenyAll",
        "properties": {
          "protocol": "*",
          "sourcePortRange": "*",
          "destinationPortRange": "*",
          "sourceAddressPrefix": "*",
          "destinationAddressPrefix": "*",
          "access": "Deny",
          "priority": 200,
          "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

✓

There is no rule to allow HTTPS traffic (port 443) from the internet.

The NSG has only two inbound rules: AllowSSH (port 22 from VirtualNetwork) and DenyAll (all traffic). There is no rule to allow HTTPS (port 443) from the internet. The DenyAll rule will block all traffic that does not match a higher-priority allow rule. Therefore, Option C is correct. Option A is incorrect because the DenyAll rule is not incorrectly placed; it's needed to block other traffic. Option B is incorrect because the SSH rule is not blocking HTTPS; it's just not allowing it. Option D is incorrect because the priority of 100 is fine.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

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 SSH rule is allowing SSH from the internet, which is a security risk.

    Why it's wrong here

    The SSH rule allows only from VirtualNetwork, not internet.

  • ✗

    The SSH rule should have a higher priority (lower number) to ensure SSH access.

    Why it's wrong here

    Priority 100 is already high; the issue is missing HTTPS rule.

  • ✗

    The DenyAll rule should have a lower priority (higher number) to allow more specific rules.

    Why it's wrong here

    The priority is already lower than the SSH rule, but that's fine; the issue is missing HTTPS rule.

  • ✓

    There is no rule to allow HTTPS traffic (port 443) from the internet.

    Why this is correct

    Without an allow rule for port 443, HTTPS traffic will be blocked by the DenyAll rule.

    Related concept

    Standard ACLs match source addresses.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

  • Standard ACLs match source addresses.
  • Extended ACLs can match source, destination, protocol and ports.
  • The first matching ACL entry is used.
  • There is usually an implicit deny at the end.

TExam Day Tips

  • Check inbound versus outbound direction.
  • Read the ACL from top to bottom.
  • Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Real-world example

How this comes up in practice

A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

What to study next

Got this wrong? Here's your next step.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related AZ-204 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this AZ-204 question test?

Implement Azure security — This question tests Implement Azure security — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: There is no rule to allow HTTPS traffic (port 443) from the internet. — The NSG has only two inbound rules: AllowSSH (port 22 from VirtualNetwork) and DenyAll (all traffic). There is no rule to allow HTTPS (port 443) from the internet. The DenyAll rule will block all traffic that does not match a higher-priority allow rule. Therefore, Option C is correct. Option A is incorrect because the DenyAll rule is not incorrectly placed; it's needed to block other traffic. Option B is incorrect because the SSH rule is not blocking HTTPS; it's just not allowing it. Option D is incorrect because the priority of 100 is fine.

What should I do if I get this AZ-204 question wrong?

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related AZ-204 ACL questions on filtering logic and placement.

What is the key concept behind this question?

Standard ACLs match source addresses.

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Last reviewed: Jun 21, 2026

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