- A
DNS
Why wrong: DNS resolves hostnames to IPs but doesn't translate private to public addresses.
- B
DHCP
Why wrong: DHCP assigns IPs to clients, not for external access to internal servers.
- C
NAT
NAT (specifically port forwarding) maps the public IP to the internal server's private IP.
- D
RADIUS
Why wrong: RADIUS is for authentication, not IP address translation.
Question 489 of 1,020
220-1201 Network Services Practice Question
This 220-1201 practice question tests your understanding of network services. 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.
A technician needs to configure a router to allow internal users to access a web server on the internet using a public IP address. The web server is hosted internally on a private IP. Which network service must be configured on the router?
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
✓
NAT
C is correct because Network Address Translation (NAT) translates the private IP address of the internal web server to a public IP address, allowing internal users to reach it over the internet. Without NAT, the router would drop packets with private source addresses destined for the internet, as private IPs are not routable on the public internet per RFC 1918.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is to think that DNS can make a private IP reachable from the internet, but DNS only resolves names to IPs and does not handle routing or address translation. NAT must be used to translate the private IP to a public IP.
Detailed technical explanation
How to think about this question
NAT operates by modifying the source IP address in the packet header (and often the source port via PAT) as the packet traverses the router, maintaining a translation table to map internal private addresses to the router's public interface address. In a real-world scenario, if the web server is on 192.168.1.10 and the router's public IP is 203.0.113.5, NAT rewrites the source to 203.0.113.5 so the web server sees the request as coming from that public IP, and the return traffic is reverse-translated back to 192.168.1.10.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Network Services — This question tests Network Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: NAT — C is correct because Network Address Translation (NAT) translates the private IP address of the internal web server to a public IP address, allowing internal users to reach it over the internet. Without NAT, the router would drop packets with private source addresses destined for the internet, as private IPs are not routable on the public internet per RFC 1918.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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