The correct answer is that traffic from 192.168.1.0/24 is translated to addresses in the range 203.0.113.10-20, using PAT. This configuration combines dynamic NAT with a pool and overload, meaning the router dynamically selects an address from the defined pool and then applies Port Address Translation to allow multiple inside hosts to share that single public IP simultaneously. On the ENCOR 350-401 exam, this tests your ability to distinguish between static NAT, dynamic NAT without overload, and dynamic NAT with overload (PAT), with the key trap being that “overload” always implies PAT, even when a pool is used. A common memory tip is to think of “overload” as the router’s way of saying “I’ll cram many private IPs into a few public ones by using unique port numbers.” Remember: if you see the keyword “overload” in the ip nat inside source command, you are looking at PAT, regardless of whether the translation uses a single address or a pool range.
350-401 NAT and DHCP Practice Question
This 350-401 practice question tests your understanding of nat and dhcp. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Analyze this NAT configuration:
```
ip nat pool GLOBAL 203.0.113.10 203.0.113.20 netmask 255.255.255.0
ip nat inside source list 1 pool GLOBAL overload
access-list 1 permit 192.168.1.0 0.0.0.255
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Traffic from 192.168.1.0/24 is translated to addresses in the range 203.0.113.10-20, using PAT.
This is dynamic NAT with overload (PAT) using a pool of addresses.
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.
✓
Traffic from 192.168.1.0/24 is translated to addresses in the range 203.0.113.10-20, using PAT.
Why this is correct
Correct. The pool provides the translated addresses, and overload enables PAT.
Each host in 192.168.1.0/24 gets a unique IP from the pool without port translation.
Why it's wrong here
Incorrect. Overload means PAT is used, so multiple hosts share addresses.
✗
The pool must include the outside interface IP address.
Why it's wrong here
Incorrect. The pool can be any range, not necessarily including the interface IP.
✗
Access-list 1 is used to filter inbound traffic.
Why it's wrong here
Incorrect. The access-list identifies inside source addresses to be translated.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-401 subnetting questions on CIDR, address ranges, and subnet selection.
NAT and DHCP — This question tests NAT and DHCP — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Traffic from 192.168.1.0/24 is translated to addresses in the range 203.0.113.10-20, using PAT. — This is dynamic NAT with overload (PAT) using a pool of addresses.
What should I do if I get this 350-401 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 350-401 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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