easyMultiple Choice
FC0-U71 Practice Question: That when they try to open a PDF file attached to…
A user reports that when they try to open a PDF file attached to an email, nothing happens. Which of the following is the most likely cause?
⚠ Common exam trap
Watch out — candidates often confuse 'nothing happens' with a network issue or antivirus blocking, but the key is that the file is already present locally and the problem is the lack of an application to interpret the file format.
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
✓
There is no software installed that can open PDF files.
If no software is installed that can handle PDF files, the operating system has no default handler to open the file. When a user clicks on a PDF attachment in an email client, the system attempts to launch the associated application (e.g., Adobe Acrobat Reader, a web browser with PDF support). If no such application is present, nothing happens—the file simply does not open, and no error message may appear depending on the email client's configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The file permissions are set to read-only.
Why it's wrong here
Read-only permissions still allow a file to be opened and viewed; they only block modification, so nothing appearing would not result. It is tempting because permission problems do cause access failures, and read-only would be the right answer if the user could open but not save the PDF.
- ✗
The antivirus software has quarantined the file.
Why it's wrong here
Quarantined files are removed from their original location, so the attachment would be missing or flagged rather than silently doing nothing when opened. It is tempting because antivirus blocking is a real cause of failed file access, and it would be correct if a warning or missing-file error appeared.
- ✓
There is no software installed that can open PDF files.
Why this is correct
A PDF file has no default handler registered, so the double-click produces no visible action. Without an installed application capable of opening PDF files, the operating system cannot launch anything, which matches the reported symptom exactly.
- ✗
The network connection is down.
Why it's wrong here
A dropped network connection would prevent downloading the attachment, but the PDF is already present and the user reports no error at all. It is tempting because connectivity failures commonly block access to resources, and it would be correct if the file were stored remotely rather than attached.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 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 FC0-U71 exam.