Quick Answer
The answer is target service accounts and priority. Priority is a mandatory component of every Google Cloud firewall rule, defined as an integer from 0 to 65535 that determines the order in which rules are evaluated; lower numbers are evaluated first, and the first matching rule is applied, making it essential for controlling traffic flow. Target service accounts allow you to apply firewall rules to specific VM instances based on their associated service account, rather than by network tag or IP range, offering a more scalable and security-focused method of rule assignment. On the Google Professional Cloud Security Engineer exam, this tests your understanding of how firewall rule components enforce granular access control, and a common trap is confusing target tags with target service accounts—remember that service accounts are identity-based, while tags are metadata-based. A useful memory tip is “Priority first, service accounts for identity,” as both are required fields when defining a rule.
This PCSE practice question tests your understanding of configuring network security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO of the following are valid Google Cloud firewall rule components? (Choose TWO.)
Priority
Priority determines the order in which rules are evaluated.
Protocol signature
Why wrong: Firewall rules do not have protocol signatures; they use protocol and port.
Target service accounts
Firewall rules can target instances by service account.
Next hop
Why wrong: Next hop is used in routes, not firewall rules.
Network tier
Why wrong: Network tier is a configuration for external IPs, not firewall rules.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Priority
A is correct because firewall rules in Google Cloud require a priority value (0–65535) to determine evaluation order. Lower numbers are evaluated first, and the first matching rule is applied. This is a mandatory component of every firewall rule.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Priority
Why this is correct
Priority determines the order in which rules are evaluated.
Related concept
Read the scenario before looking for a memorised answer.
Protocol signature
Why it's wrong here
Firewall rules do not have protocol signatures; they use protocol and port.
Target service accounts
Why this is correct
Firewall rules can target instances by service account.
Related concept
Read the scenario before looking for a memorised answer.
Next hop
Why it's wrong here
Next hop is used in routes, not firewall rules.
Network tier
Common exam traps
Google Cloud often tests the distinction between firewall rule components and routing/network tier components, so candidates mistakenly select 'Next hop' or 'Network tier' because they are familiar networking terms, but they are not part of a firewall rule definition.
Detailed technical explanation
Firewall rules in Google Cloud are stateful and evaluated in order of priority, with an implicit deny-all at the lowest priority (65535). Each rule consists of direction (ingress/egress), action (allow/deny), source/destination IP ranges, protocols/ports, and optionally target tags or service accounts. Priority values can be set in increments of 1, and overlapping rules can cause unexpected behavior if not carefully ordered.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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FAQ
Configuring network security — This question tests Configuring network security — Read the scenario before looking for a memorised answer..
The correct answer is: Priority — A is correct because firewall rules in Google Cloud require a priority value (0–65535) to determine evaluation order. Lower numbers are evaluated first, and the first matching rule is applied. This is a mandatory component of every firewall rule.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This PCSE practice question is part of Courseiva's free Google Cloud 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 PCSE exam.
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