hardMultiple ChoiceObjective-mapped
XK0-006 Practice Question: Refer to the exhibit
Exhibit
User reports: "I can't access the web server at https://example.com from my office network." From the user's workstation: $ nslookup example.com Server: 192.168.1.1 Address: 192.168.1.1#53 Non-authoritative answer: Name: example.com Address: 10.0.0.5 From another host on the same subnet: $ curl -I https://example.com HTTP/2 200 From the user's workstation: $ curl -I https://example.com curl: (7) Failed to connect to example.com port 443: Connection refused $ iptables -L -n -v Chain INPUT (policy ACCEPT 0 packets, 0 bytes) Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
Refer to the exhibit. A user cannot access a web server, but another host on the same subnet can. What is the most likely cause?
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
✓
The user's workstation has a local firewall blocking outbound HTTPS.
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 network router is blocking the user's traffic.
Why it's wrong here
If the router blocked it, the other host on the same subnet would likely also be blocked.
- ✗
The web server is down.
Why it's wrong here
Another host can access it, so the server is up.
- ✗
DNS is resolving to the wrong IP for the user.
Why it's wrong here
nslookup shows the same IP as likely used by the other host, and resolution is consistent.
- ✓
The user's workstation has a local firewall blocking outbound HTTPS.
Why this is correct
The iptables output shows no rules, but the user's workstation gets 'Connection refused' while another host succeeds, indicating the issue is local to the workstation. A local firewall (e.g., software firewall) might be blocking outbound 443.
Visual reference
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Related to this question
Learn chapter
User and Group Administration
Key term
Subnet
A subnet is a logical subdivision of an IP network, created by partitioning a larger network address space using subnet masks.
Key term
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 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 XK0-006 exam.