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300-410 Practice Question: Consider the following partial configuration on a…
Consider the following partial configuration on a Cisco IOS-XE router:
interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0 ip nat inside
!
interface GigabitEthernet0/1 ip address 203.0.113.1 255.255.255.0 ip nat outside
!
ip nat inside source list 1 interface GigabitEthernet0/1 overload access-list 1 permit 192.168.1.0 0.0.0.255
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the distinction between 'ip nat inside source list <acl> interface <interface> overload' (dynamic PAT using the interface IP) and configurations that require a NAT pool or static mapping, leading candidates to mistakenly think a pool is mandatory for any dynamic translation.
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
✓
All traffic from 192.168.1.0/24 is translated to 203.0.113.1 using PAT.
The configuration uses an ACL (access-list 1) to match traffic from the 192.168.1.0/24 subnet, and the 'ip nat inside source list 1 interface GigabitEthernet0/1 overload' command translates all matching source IP addresses to the single IP address 203.0.113.1 (the outside interface IP) using Port Address Translation (PAT). This is a classic dynamic NAT overload configuration, where multiple internal hosts share one public IP by multiplexing on source ports.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
All traffic from 192.168.1.0/24 is translated to 203.0.113.1 using PAT.
Why this is correct
The 'overload' keyword enables PAT, and the ACL matches the inside network.
- ✗
Only traffic from 192.168.1.1 is translated to 203.0.113.1 using PAT.
Why it's wrong here
The ACL permits the entire /24 subnet, not just the router's interface IP.
- ✗
Traffic is translated using static NAT to 203.0.113.1.
Why it's wrong here
The command uses 'ip nat inside source list' which is dynamic NAT, not static.
- ✗
The configuration is incomplete; a NAT pool is required for dynamic translation.
Why it's wrong here
When using an interface with overload, no pool is needed; the interface IP is used.
Visual reference
Quick reference
IPv4 Address Class Summary
| Class | First Octet Range | Default Mask | Networks | Hosts per Network |
|---|---|---|---|---|
| A | 1–126 | /8 (255.0.0.0) | 126 | 16,777,214 |
| B | 128–191 | /16 (255.255.0.0) | 16,384 | 65,534 |
| C | 192–223 | /24 (255.255.255.0) | 2,097,152 | 254 |
| D | 224–239 | N/A | Multicast groups | — |
| E | 240–255 | N/A | Reserved / experimental | — |
127.x.x.x is reserved for loopback. Modern networks use CIDR (classless) rather than classful addressing.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco 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 300-410 exam.