hardMultiple ChoiceObjective-mapped
ISC2 CC Practice Question: Refer to the exhibit
Exhibit
ip nat inside source static tcp 192.168.1.10 80 200.100.50.1 80 ip nat pool POOL 200.100.50.1 200.100.50.10 netmask 255.255.255.0 ip nat inside source list 1 pool POOL overload access-list 1 permit 192.168.1.0 0.0.0.255 interface GigabitEthernet0/0 ip address 200.100.50.1 255.255.255.0 ip nat outside interface GigabitEthernet0/1 ip address 192.168.1.1 255.255.255.0 ip nat inside
Refer to the exhibit. The network administrator configured NAT as shown. Internal hosts can access the internet, but no external hosts can access the company's web server (192.168.1.10). What is the issue?
⚠ Common exam trap
ISC2 often tests the misconception that static NAT always overrides dynamic NAT, but the trap here is that an overlapping pool address causes a conflict that prevents the static translation from being installed, not a priority issue.
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
✓
The pool includes the static IP causing conflict
The dynamic NAT pool includes the IP address 200.100.50.1, which is also used for the static NAT mapping to the web server. When a packet arrives from the internet destined for the static NAT address, the router first checks dynamic NAT entries and may assign that address from the pool to an internal host, causing a conflict and preventing the static translation from being applied. This is a classic IP address overlap issue where the pool should exclude the static NAT address.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The static NAT is being overridden by the dynamic NAT
Why it's wrong here
Static NAT takes precedence, but the conflict still causes issues.
- ✗
The outside interface should be the inside interface
Why it's wrong here
The outside interface is correctly identified as the internet-facing interface.
- ✗
The web server is not in the access-list
Why it's wrong here
The access-list permits the entire subnet 192.168.1.0/24, which includes the web server.
- ✓
The pool includes the static IP causing conflict
Why this is correct
The pool range includes 200.100.50.1, which is already used by the static NAT, causing a conflict.
Visual reference
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Related to this question
Learn chapter
Access Control Fundamentals
Key term
Static NAT
Static Network Address Translation (NAT) is a one-to-one mapping between a private IP address and a public IP address that never changes.
Key term
Dynamic NAT
Dynamic NAT is a method of mapping multiple private IP addresses to a pool of public IP addresses automatically, allowing many devices to share a limited number of public addresses.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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