- A
Set up port forwarding on the router
Why wrong: Port forwarding directs traffic to the correct internal device, but it does not solve the problem of the public IP address changing.
- B
Configure a dynamic DNS (DDNS) service
DDNS automatically updates a domain name with the current public IP, providing a stable address for remote access.
- C
Assign each employee a static IP address on the office network
Why wrong: Static IPs on the internal network are irrelevant for external access; the issue is the public IP address of the office.
- D
Use a VPN with a static IP assigned by the ISP
Why wrong: Requesting a static IP from the ISP is an option, but it usually involves additional cost and is not the most common solution; DDNS is more flexible.
Question 530 of 750
Dynamic DNS for Remote Desktop with Dynamic IP
This 220-1202 practice question tests your understanding of remote access technologies. 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 is setting up a remote desktop solution for a small business with five employees who need to access their office PCs from home. The office uses a dynamic public IP address. Which of the following should the technician configure to ensure reliable remote access without requiring users to remember a changing IP?
Quick Answer
The correct answer is to configure a dynamic DNS (DDNS) service. This solution solves the core problem of a dynamic public IP address by automatically updating a domain name to point to the current IP, so users can reliably connect to their office PCs using a consistent hostname like "office.remoteaccess.com" instead of memorizing a changing number. On the CompTIA A+ Core 2 220-1202 exam, this scenario tests your understanding of how to maintain remote access availability without requiring a costly static IP from the ISP. A common trap is confusing DDNS with port forwarding—while port forwarding directs traffic to the correct internal device, it does nothing to solve the IP address change issue. Remember the memory tip: "DDNS keeps the name linked to the number," so users always have a fixed address to type, even when the underlying IP shifts.
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
✓
Configure a dynamic DNS (DDNS) service
Option B is correct because a dynamic DNS (DDNS) service maps a fixed hostname (e.g., remote.office.com) to the office’s changing public IP address. The technician configures the router or a client to update the DDNS provider automatically whenever the ISP-assigned IP changes, so employees can always connect using the same hostname without tracking the current IP.
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.
- ✗
Set up port forwarding on the router
Why it's wrong here
Port forwarding directs traffic to the correct internal device, but it does not solve the problem of the public IP address changing.
- ✓
Configure a dynamic DNS (DDNS) service
Why this is correct
DDNS automatically updates a domain name with the current public IP, providing a stable address for remote access.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Assign each employee a static IP address on the office network
Why it's wrong here
Static IPs on the internal network are irrelevant for external access; the issue is the public IP address of the office.
- ✗
Use a VPN with a static IP assigned by the ISP
Why it's wrong here
Requesting a static IP from the ISP is an option, but it usually involves additional cost and is not the most common solution; DDNS is more flexible.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The A+ exam often tests the distinction between internal static IPs (which are irrelevant for public access) and external static IPs (which require ISP involvement), leading candidates to mistakenly choose assigning static IPs on the office network as a solution for a dynamic public IP.
Detailed technical explanation
How to think about this question
DDNS relies on a client (often built into the router or a lightweight agent on a PC) that sends periodic HTTP/HTTPS updates to the DDNS provider’s API (e.g., using RFC 2136 or vendor-specific protocols) to associate the current public IP with a fully qualified domain name. In real-world deployments, if the DDNS update fails during an IP change, remote access can be interrupted until the next update cycle; many routers support multiple DDNS providers and can be configured with a low TTL (e.g., 60 seconds) to minimize downtime.
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 practitioner preparing for the 220-1202 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this 220-1202 question test?
Remote Access Technologies — This question tests Remote Access Technologies — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure a dynamic DNS (DDNS) service — Option B is correct because a dynamic DNS (DDNS) service maps a fixed hostname (e.g., remote.office.com) to the office’s changing public IP address. The technician configures the router or a client to update the DDNS provider automatically whenever the ISP-assigned IP changes, so employees can always connect using the same hostname without tracking the current IP.
What should I do if I get this 220-1202 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
This 220-1202 practice question is part of Courseiva's free CompTIA 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 220-1202 exam.
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