- A
Opening the file in a text editor
Why wrong: Opening may corrupt or be unsafe, and not all file types are text-readable.
- B
Checking the file extension
Why wrong: Extensions can be easily changed and are not reliable.
- C
Examining the file's magic bytes
Magic bytes are consistent and reliable for file type identification.
- D
Checking the file size
Why wrong: File size is not indicative of file type.
Question 106 of 1,000
200-201 Host-Based Analysis Practice Question
This 200-201 practice question tests your understanding of host-based analysis. 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.
When performing file analysis, which method is most reliable for determining the actual file type regardless of its extension?
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
✓
Examining the file's magic bytes
Magic bytes (or file signatures) are unique byte sequences at the beginning of a file that identify its format regardless of the file extension. This method is reliable because it examines the actual binary content, such as the 'PK' header for ZIP files or '‰PNG' for PNG images, rather than relying on user-assigned metadata that can be easily changed.
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.
- ✗
Opening the file in a text editor
Why it's wrong here
Opening may corrupt or be unsafe, and not all file types are text-readable.
- ✗
Checking the file extension
Why it's wrong here
Extensions can be easily changed and are not reliable.
- ✓
Examining the file's magic bytes
Why this is correct
Magic bytes are consistent and reliable for file type identification.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Checking the file size
Why it's wrong here
File size is not indicative of file type.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the concept that file extensions are user-modifiable metadata and thus unreliable, while magic bytes provide a content-based verification that is independent of the filename.
Detailed technical explanation
How to think about this question
Magic bytes are defined by file format specifications, such as the first 4 bytes of a PDF being '%PDF' (0x25 0x50 0x44 0x46) or the first 2 bytes of a JPEG being 0xFF 0xD8. Tools like the Linux 'file' command read these signatures and compare them against a database (e.g., /usr/share/misc/magic) to determine the file type, even if the extension is missing or incorrect. In real-world forensics, this is critical for detecting disguised malware, such as an executable renamed as a .txt file.
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 200-201 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 200-201 question test?
Host-Based Analysis — This question tests Host-Based Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Examining the file's magic bytes — Magic bytes (or file signatures) are unique byte sequences at the beginning of a file that identify its format regardless of the file extension. This method is reliable because it examines the actual binary content, such as the 'PK' header for ZIP files or '‰PNG' for PNG images, rather than relying on user-assigned metadata that can be easily changed.
What should I do if I get this 200-201 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 200-201 practice question is part of Courseiva's free Cisco 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 200-201 exam.
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