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Question 746 of 1,000

Implementing VPC Instances →hardMultiple ChoiceObjective-mapped

PCNE Implementing VPC Instances Practice Question

This PCNE practice question tests your understanding of implementing vpc instances. 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 network engineer configured a hierarchical firewall policy at the organization level with a priority 100 rule that denies all ingress traffic. At the folder level, a policy with priority 110 allows ingress from a specific IP range. At the VPC level, a network firewall policy with priority 90 allows ingress from a different IP range. Which traffic will be allowed?

A
Traffic matching either the folder-level or VPC-level allow rules
Why wrong: The folder-level allow is overridden by the org-level deny; only the VPC-level allow is effective.
B
Only traffic matching the folder-level allow rule
Why wrong: The org-level deny has higher priority (100) than the folder allow (110), so folder allow is overridden.
C
Only traffic matching the VPC-level allow rule
The VPC-level policy has priority 90, which is lower than the org-level deny (100), so it overrides the deny and allows matching traffic.
D
No traffic is allowed because the org-level deny is evaluated last
Why wrong: Hierarchical policies are evaluated in priority order, and the VPC policy is evaluated after hierarchical policies but with lower priority number, so it overrides.

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

✓

Only traffic matching the VPC-level allow rule

Hierarchical firewall policies are evaluated in order of priority (lower number = higher priority) and then network firewall policies. The org-level rule with priority 100 denies all ingress. The folder-level rule with priority 110 allows specific IPs, but since the org rule has higher priority, it overrides the folder rule. The VPC-level network firewall policy is evaluated after hierarchical policies and has priority 90, which is lower than 100, so it would override the org rule. However, hierarchical policies are evaluated before network firewall policies only if they have higher priority. Here, the VPC policy has priority 90, which is lower than 100, so it takes precedence over the org-level deny. Thus, traffic matching the VPC policy's allowed IP range is allowed.

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.

✗
Traffic matching either the folder-level or VPC-level allow rules
Why it's wrong here
The folder-level allow is overridden by the org-level deny; only the VPC-level allow is effective.
✗
Only traffic matching the folder-level allow rule
Why it's wrong here
The org-level deny has higher priority (100) than the folder allow (110), so folder allow is overridden.
✓
Only traffic matching the VPC-level allow rule
Why this is correct
The VPC-level policy has priority 90, which is lower than the org-level deny (100), so it overrides the deny and allows matching traffic.
Related concept
Standard ACLs match source addresses.
✗
No traffic is allowed because the org-level deny is evaluated last
Why it's wrong here
Hierarchical policies are evaluated in priority order, and the VPC policy is evaluated after hierarchical policies but with lower priority number, so it overrides.

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 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 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 PCNE ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this PCNE question test?

Implementing VPC Instances — This question tests Implementing VPC Instances — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Only traffic matching the VPC-level allow rule — Hierarchical firewall policies are evaluated in order of priority (lower number = higher priority) and then network firewall policies. The org-level rule with priority 100 denies all ingress. The folder-level rule with priority 110 allows specific IPs, but since the org rule has higher priority, it overrides the folder rule. The VPC-level network firewall policy is evaluated after hierarchical policies and has priority 90, which is lower than 100, so it would override the org rule. However, hierarchical policies are evaluated before network firewall policies only if they have higher priority. Here, the VPC policy has priority 90, which is lower than 100, so it takes precedence over the org-level deny. Thus, traffic matching the VPC policy's allowed IP range is allowed.

What should I do if I get this PCNE question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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