mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Given this partial configuration: ip nat pool…
Given this partial configuration:
ip nat pool MYPOOL 203.0.113.10 203.0.113.20 netmask 255.255.255.0 ip nat inside source list 1 pool MYPOOL access-list 1 permit 192.168.1.0 0.0.0.255
What is the effect?
⚠ Common exam trap
Cisco often tests the distinction between dynamic NAT and PAT by omitting the 'overload' keyword, leading candidates to assume PAT is always used with a pool when in fact it must be explicitly configured.
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
✓
Inside hosts are dynamically mapped to a pool address; if the pool is exhausted, new translations fail.
The configuration uses a standard ACL to match inside hosts (192.168.1.0/24) and dynamically assigns them a unique address from the pool 203.0.113.10–203.0.113.20. Because no 'overload' keyword is present, PAT is not enabled; each translation consumes a pool address, and once all 11 addresses are used, new translations fail until an existing translation times out or is cleared.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Inside hosts are translated to addresses in the pool using PAT.
Why it's wrong here
No 'overload' keyword means no port multiplexing; it's one-to-one dynamic NAT.
- ✓
Inside hosts are dynamically mapped to a pool address; if the pool is exhausted, new translations fail.
Why this is correct
Without overload, each translation consumes one pool address; exhaustion blocks new flows.
- ✗
The router uses the pool address as the source for all outbound traffic, regardless of ACL.
Why it's wrong here
The ACL restricts which inside addresses are eligible for translation.
- ✗
This configuration requires the 'ip nat outside' interface command to function.
Why it's wrong here
While 'ip nat outside' is needed on the outside interface, the question asks about the effect of the given commands alone; the effect is dynamic NAT without overload.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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