PCNSE Deploy and Configure Firewalls Practice Question
This PCNSE practice question tests your understanding of deploy and configure firewalls. 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.
Which THREE are valid methods to provide redundancy for outbound internet traffic in a Palo Alto Networks firewall?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Active/Passive HA with floating IP
Active/Passive HA with floating IP (Option A) is valid because the passive firewall assumes the active firewall's IP address upon failover, ensuring outbound traffic continues via the same default gateway. ECMP with equal cost routes (Option B) distributes outbound traffic across multiple paths and provides redundancy by automatically failing over if one path is lost. Policy Based Forwarding combined with path monitoring (Option C) allows you to define forwarding policies based on traffic attributes and monitor path health, redirecting traffic if a monitored path fails.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Active/Passive HA with floating IP
Why this is correct
HA provides failover; the floating IP moves to the active firewall.
Related concept
Read the scenario before looking for a memorised answer.
✓
ECMP with equal cost routes
Why this is correct
ECMP provides load balancing and automatic failover if a route becomes unavailable.
Related concept
Read the scenario before looking for a memorised answer.
✓
Policy Based Forwarding combined with path monitoring
Why this is correct
PBF with path monitoring can switch to a backup path if the primary fails.
Related concept
Read the scenario before looking for a memorised answer.
✗
Active/Passive HA with virtual router synchronization
Why it's wrong here
VR synchronization is a mechanism within HA, not a separate redundancy method.
✗
Use of multiple public IPs with NAT rules
Why it's wrong here
Multiple IPs alone do not provide redundancy; routing must also be configured.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse virtual router synchronization (which only replicates routing tables) with actual failover mechanisms like floating IPs or path monitoring, assuming that synchronized routing alone provides redundancy for outbound traffic.
Detailed technical explanation
How to think about this question
In Active/Passive HA, the floating IP is a virtual IP that moves with the active firewall, typically using gratuitous ARP to update upstream switches. ECMP relies on the firewall's routing table having multiple routes with equal administrative distance and metric, and the firewall uses a hash-based algorithm (e.g., source/destination IP) to select a path; path monitoring can be added to remove failed routes. Policy Based Forwarding with path monitoring uses a monitoring target (e.g., ping to an internet IP) and a failure condition to switch traffic to a backup egress interface, but it requires careful configuration to avoid asymmetric routing.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deploy and Configure Firewalls — This question tests Deploy and Configure Firewalls — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Active/Passive HA with floating IP — Active/Passive HA with floating IP (Option A) is valid because the passive firewall assumes the active firewall's IP address upon failover, ensuring outbound traffic continues via the same default gateway. ECMP with equal cost routes (Option B) distributes outbound traffic across multiple paths and provides redundancy by automatically failing over if one path is lost. Policy Based Forwarding combined with path monitoring (Option C) allows you to define forwarding policies based on traffic attributes and monitor path health, redirecting traffic if a monitored path fails.
What should I do if I get this PCNSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This PCNSE practice question is part of Courseiva's free Palo Alto Networks 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 PCNSE exam.
Question Discussion
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