- A
Source IP: The IP addresses or CIDR blocks from which traffic originates.
This correctly defines Source IP as the origin of traffic.
- B
Destination IP: The IP addresses or CIDR blocks to which traffic is directed.
This correctly defines Destination IP as the target of traffic.
- C
Action: Whether to allow or deny matching traffic.
This correctly defines Action as the allow/deny decision.
- D
Priority: An integer that determines the order in which rules are evaluated; lower numbers are evaluated first.
This correctly defines Priority as the evaluation order.
- E
Source IP: The IP addresses to which traffic is directed.
Why wrong: Incorrect — this describes Destination IP, not Source IP.
- F
Priority: Whether to allow or deny matching traffic.
Why wrong: Incorrect — this describes Action, not Priority.
VPC Firewall Rule Components
This PCSE practice question tests your understanding of pcse exam topics. 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.
Match each VPC firewall rule component to its definition.
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
Source IP: The IP addresses or CIDR blocks from which traffic originates.
VPC firewall rules consist of components like Source IP (traffic origin), Destination IP (traffic target), Action (allow/deny), and Priority (evaluation order). Common confusions include swapping Source and Destination, or confusing Action with Priority.
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.
- ✓
Source IP: The IP addresses or CIDR blocks from which traffic originates.
Why this is correct
This correctly defines Source IP as the origin of traffic.
Related concept
CIDR notation defines the prefix length.
- ✓
Destination IP: The IP addresses or CIDR blocks to which traffic is directed.
Why this is correct
This correctly defines Destination IP as the target of traffic.
Related concept
CIDR notation defines the prefix length.
- ✓
Action: Whether to allow or deny matching traffic.
Why this is correct
This correctly defines Action as the allow/deny decision.
Related concept
CIDR notation defines the prefix length.
- ✓
Priority: An integer that determines the order in which rules are evaluated; lower numbers are evaluated first.
Why this is correct
This correctly defines Priority as the evaluation order.
Related concept
CIDR notation defines the prefix length.
- ✗
Source IP: The IP addresses to which traffic is directed.
Why it's wrong here
Incorrect — this describes Destination IP, not Source IP.
- ✗
Priority: Whether to allow or deny matching traffic.
Why it's wrong here
Incorrect — this describes Action, not Priority.
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 PCSE subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this PCSE question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Source IP: The IP addresses or CIDR blocks from which traffic originates. — VPC firewall rules consist of components like Source IP (traffic origin), Destination IP (traffic target), Action (allow/deny), and Priority (evaluation order). Common confusions include swapping Source and Destination, or confusing Action with Priority.
What should I do if I get this PCSE 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 PCSE 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 11, 2026
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