NSE7 Enterprise Firewall and VDOMs Practice Question
This NSE7 practice question tests your understanding of enterprise firewall and vdoms. 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.
An administrator configures a VDOM link between VDOMs A and B. In VDOM A, the VDOM link interface is assigned IP 10.10.10.1/24, and in VDOM B, it is assigned 10.10.10.2/24. A firewall policy on VDOM A allows traffic from a subnet in VDOM A to a subnet in VDOM B. However, traffic fails. The admin checks the routing table in VDOM A and sees a route to the destination subnet via 10.10.10.2. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
No firewall policy in VDOM B to allow traffic from the VDOM link
Option A is correct. In VDOM B, there must be a firewall policy allowing inbound traffic from the VDOM link. Without it, the traffic will be dropped upon entering VDOM B.
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.
✓
No firewall policy in VDOM B to allow traffic from the VDOM link
Why this is correct
Traffic entering VDOM B must be permitted by a policy. If missing, packets are dropped.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
The VDOM link is not administratively up in VDOM B
Why it's wrong here
If the link were down, the route in VDOM A would be unreachable.
✗
Inter-VDOM routing is disabled globally
Why it's wrong here
Inter-VDOM routing is automatically enabled when using VDOM links.
✗
The subnet in VDOM B is not defined as an address object in VDOM A's policy
Why it's wrong here
The policy destination can be an address; as long as it matches, it's fine.
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 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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related NSE7 subnetting questions on CIDR, address ranges, and subnet selection.
Enterprise Firewall and VDOMs — This question tests Enterprise Firewall and VDOMs — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: No firewall policy in VDOM B to allow traffic from the VDOM link — Option A is correct. In VDOM B, there must be a firewall policy allowing inbound traffic from the VDOM link. Without it, the traffic will be dropped upon entering VDOM B.
What should I do if I get this NSE7 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 NSE7 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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