- A
DNS and DHCP
Why wrong: DHCP assigns internal IPs but does not help external users reach the server; DNS is correct, but DHCP is not needed for this.
- B
DNS and NAT
DNS resolves the domain to the public IP, and NAT (with port forwarding) directs traffic to the internal server.
- C
NAT and ARP
Why wrong: ARP resolves IPs to MACs locally but does not handle external name resolution or public-to-private translation.
- D
DHCP and NAT
Why wrong: DHCP is not required for external access; DNS is missing, which is essential for name resolution.
Question 1,004 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 company's web server is hosted internally and must be accessible from the internet using the domain name www.company.com. The public IP address of the router is 203.0.113.5. Which two network services must be correctly configured to make this work?
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
✓
DNS and NAT
DNS is required to resolve the domain name www.company.com to the public IP address 203.0.113.5, so external users can reach the router. NAT (specifically destination NAT or port forwarding) is needed to translate the public IP and port to the internal private IP address of the web server, allowing inbound traffic to reach the internal host.
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.
- ✗
DNS and DHCP
- ✓
DNS and NAT
- ✗
NAT and ARP
- ✗
DHCP and NAT
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common misconception is that DHCP is required for internet access, but here the internal server already has a static IP; the key missing services are DNS for name resolution and NAT for address translation from public to private.
Detailed technical explanation
How to think about this question
For inbound access, DNS must have an A record mapping www.company.com to the router's public IP (203.0.113.5). The router then uses destination NAT (often called port forwarding) to rewrite the destination IP and port to the internal server's private address (e.g., 192.168.1.10:80). Without NAT, the router would drop packets destined for the public IP because it has no route to that address internally. In real-world scenarios, a static NAT entry or an access control list (ACL) is often combined with NAT to restrict which external sources can initiate connections.
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: DNS and NAT — DNS is required to resolve the domain name www.company.com to the public IP address 203.0.113.5, so external users can reach the router. NAT (specifically destination NAT or port forwarding) is needed to translate the public IP and port to the internal private IP address of the web server, allowing inbound traffic to reach the internal host.
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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