350-401 Practice Question: Given this NAT configuration: ``` interface…

Given this NAT configuration: ```

interface GigabitEthernet0/0
 ip address 10.0.0.1 255.255.255.0
 ip nat inside

interface GigabitEthernet0/1
 ip address 198.51.100.1 255.255.255.0
 ip nat outside

ip nat inside source static 10.0.0.5 198.51.100.5

``` What is the purpose of this configuration?

⚠ Common exam trap

Cisco often tests the misconception that all NAT configurations require an access list, but static NAT is a notable exception—it uses a direct mapping and does not need an ACL to define the inside host.

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

✓

It creates a one-to-one mapping between 10.0.0.5 and 198.51.100.5, allowing inbound and outbound traffic.

The configuration uses the 'ip nat inside source static' command to create a permanent one-to-one mapping between the inside local address 10.0.0.5 and the inside global address 198.51.100.5. This static NAT allows both outbound traffic (source translation) and inbound traffic (destination translation) to and from the mapped host, enabling bidirectional communication without the need for an access list.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
It translates all traffic from 10.0.0.0/24 to 198.51.100.0/24 using PAT.
Why it's wrong here
Incorrect. This is static NAT for a single host, not dynamic PAT for the entire subnet.
✓
It creates a one-to-one mapping between 10.0.0.5 and 198.51.100.5, allowing inbound and outbound traffic.
Why this is correct
Correct. Static NAT provides a fixed mapping for both directions.
✗
It translates only outbound traffic from 10.0.0.5 to 198.51.100.5.
Why it's wrong here
Incorrect. Static NAT also translates inbound traffic to the inside host.
✗
The configuration is incomplete; it needs an access-list.
Why it's wrong here
Incorrect. Static NAT does not require an access-list.

Visual reference

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Last reviewed: Jul 4, 2026

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