200-901 Application Deployment and Security Practice Question
This 200-901 practice question tests your understanding of application deployment and security. 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
configure terminal
ip http server
ip http secure-server
ip http authentication local
ip http access-class 23
!
access-list 23 permit 192.168.1.0 0.0.0.255
Refer to the exhibit. A developer from subnet 10.10.10.0/24 cannot reach the RESTCONF API on the IOS-XE device. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
configure terminal
ip http server
ip http secure-server
ip http authentication local
ip http access-class 23
!
access-list 23 permit 192.168.1.0 0.0.0.255
A
HTTPS is not enabled on the device.
Why wrong: The 'ip http secure-server' command enables HTTPS.
B
The HTTP server is not enabled.
Why wrong: The configuration includes 'ip http server', so HTTP is enabled.
C
Authentication is not configured as local.
Why wrong: Authentication is set to local with 'ip http authentication local'.
D
The 10.10.10.0/24 subnet is not permitted by the access-class.
Access-list 23 permits only 192.168.1.0/24, blocking all other subnets.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The 10.10.10.0/24 subnet is not permitted by the access-class.
The access-class configured under the RESTCONF API restricts incoming connections to specific subnets. Since the developer is on subnet 10.10.10.0/24, which is not listed in the permit statement, all HTTPS requests from that subnet are dropped before reaching the API. This is the most direct cause of the connectivity failure.
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.
✗
HTTPS is not enabled on the device.
Why it's wrong here
The 'ip http secure-server' command enables HTTPS.
✗
The HTTP server is not enabled.
Why it's wrong here
The configuration includes 'ip http server', so HTTP is enabled.
✗
Authentication is not configured as local.
Why it's wrong here
Authentication is set to local with 'ip http authentication local'.
✓
The 10.10.10.0/24 subnet is not permitted by the access-class.
Why this is correct
Access-list 23 permits only 192.168.1.0/24, blocking all other subnets.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between HTTP/HTTPS server enablement and access-class filtering, trapping candidates who assume RESTCONF requires the HTTP server or that authentication is the root cause when a subnet is blocked.
Trap categories for this question
Command / output trap
The 'ip http secure-server' command enables HTTPS.
Detailed technical explanation
How to think about this question
RESTCONF on IOS-XE relies on the 'ip http secure-server' command for HTTPS and uses an 'ip access-class' to filter incoming connections at the VTY line level. The access-class applies before any authentication or API processing, meaning packets from non-permitted subnets are silently dropped. In real-world deployments, misconfigured access-classes are a common cause of RESTCONF unreachability, often mistaken for authentication or server issues.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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.
Application Deployment and Security — This question tests Application Deployment and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The 10.10.10.0/24 subnet is not permitted by the access-class. — The access-class configured under the RESTCONF API restricts incoming connections to specific subnets. Since the developer is on subnet 10.10.10.0/24, which is not listed in the permit statement, all HTTPS requests from that subnet are dropped before reaching the API. This is the most direct cause of the connectivity failure.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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