220-1202 Malware Types and Removal Practice Question
This 220-1202 practice question tests your understanding of malware types and removal. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
During a routine security audit, a technician discovers that a user's computer has a program that opens a backdoor on port 4444 and allows remote control. The program was installed alongside a free PDF converter the user downloaded last week. Which malware type is this, and what is the most effective removal method?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Trojan horse; boot into Safe Mode and run a full anti-malware scan.
A Trojan horse disguises as legitimate software (the PDF converter) but contains malicious code. This Trojan opens a backdoor (a RAT). Removal requires disconnecting from the network, booting into Safe Mode, and using an updated anti-malware scanner to eliminate the Trojan and its persistence mechanisms.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Worm; use a network-based firewall to block port 4444.
Why it's wrong here
Worms self-replicate; blocking the port does not remove the malware.
✓
Trojan horse; boot into Safe Mode and run a full anti-malware scan.
Why this is correct
The program is a Trojan that came bundled with freeware; Safe Mode scanning can remove it.
Related concept
Static NAT maps one inside address to one outside address.
✗
Ransomware; pay the ransom to regain control.
Why it's wrong here
Ransomware encrypts files, not open backdoors.
✗
Rootkit; perform a clean installation of Windows.
Why it's wrong here
While a rootkit may hide, the described behavior matches a Trojan; a clean install is not the first step.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 220-1202 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1202 NAT questions on configuration and troubleshooting.
Malware Types and Removal — This question tests Malware Types and Removal — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Trojan horse; boot into Safe Mode and run a full anti-malware scan. — A Trojan horse disguises as legitimate software (the PDF converter) but contains malicious code. This Trojan opens a backdoor (a RAT). Removal requires disconnecting from the network, booting into Safe Mode, and using an updated anti-malware scanner to eliminate the Trojan and its persistence mechanisms.
What should I do if I get this 220-1202 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1202 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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