EX200 Deploy, configure, and maintain systems Practice Question
This EX200 practice question tests your understanding of deploy, configure, and maintain systems. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
$ journalctl -u sshd.service -p err --since yesterday
-- Logs begin at Mon 2024-03-25 10:00:00 EDT, end at Tue 2024-03-26 09:30:00 EDT
Mar 25 14:22:31 server sshd[1234]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.1.100 user=root
Mar 25 14:22:35 server sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2
Mar 25 14:23:01 server sshd[1235]: fatal: Unable to negotiate with 192.168.1.101 port 22: no matching host key type found. Their offer: ssh-rsa,ssh-dss
Mar 25 14:23:02 server sshd[1235]: Connection closed by 192.168.1.101
Refer to the exhibit. An administrator sees that a user from 192.168.1.101 cannot connect to the SSH server. Based on the log, what is the most probable cause?
$ journalctl -u sshd.service -p err --since yesterday
-- Logs begin at Mon 2024-03-25 10:00:00 EDT, end at Tue 2024-03-26 09:30:00 EDT
Mar 25 14:22:31 server sshd[1234]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.1.100 user=root
Mar 25 14:22:35 server sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2
Mar 25 14:23:01 server sshd[1235]: fatal: Unable to negotiate with 192.168.1.101 port 22: no matching host key type found. Their offer: ssh-rsa,ssh-dss
Mar 25 14:23:02 server sshd[1235]: Connection closed by 192.168.1.101
A
The client's host key type is not supported by the server
The log shows negotiation failure due to missing host key type.
B
The server's firewall is blocking the connection
Why wrong: No firewall-related messages in the log.
C
The SSH service is not running
Why wrong: The log shows sshd activity, so the service is running.
D
The client's IP is blacklisted
Why wrong: No blacklist messages appear in the log.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The client's host key type is not supported by the server
Option A is correct. The log clearly states 'no matching host key type found'. This indicates the client offers host key types that the server does not support. Option B is possible but not indicated in the log. Option C is unlikely because the service accepted connections from other IPs. Option D is not shown.
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.
✓
The client's host key type is not supported by the server
Why this is correct
The log shows negotiation failure due to missing host key type.
Related concept
Read the scenario before looking for a memorised answer.
The log shows sshd activity, so the service is running.
✗
The client's IP is blacklisted
Why it's wrong here
No blacklist messages appear in the log.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
The log shows sshd activity, so the service is running.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 EX200 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 EX200 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Deploy, configure, and maintain systems — This question tests Deploy, configure, and maintain systems — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The client's host key type is not supported by the server — Option A is correct. The log clearly states 'no matching host key type found'. This indicates the client offers host key types that the server does not support. Option B is possible but not indicated in the log. Option C is unlikely because the service accepted connections from other IPs. Option D is not shown.
What should I do if I get this EX200 question wrong?
Identify which EX200 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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