200-901 Cisco Platforms and Development Practice Question
This 200-901 practice question tests your understanding of cisco platforms and development. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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
Refer to the exhibit.
```
subscription telemetry
stream yang-push
filter "/interfaces/interface/state/oper-status"
encoding encode-kvp
source-address 192.168.1.1
receiver ip 10.10.10.1 port 2000 protocol tls
```
Refer to the exhibit. Which statement correctly describes this subscription configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It subscribes to YANG-push notifications for interface state data.
Option A is correct because the subscription configuration uses YANG-push notifications to stream interface state data. The presence of a subscription ID, a YANG-push filter (e.g., 'ietf-interfaces:interfaces-state'), and a destination group (e.g., '10.1.1.1:2000') indicates that the device is configured to push telemetry data for interface operational state changes to a receiver using the YANG-push model, which is a standard mechanism for streaming data from network devices.
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.
✓
It subscribes to YANG-push notifications for interface state data.
Why this is correct
Correct description.
Related concept
Read the scenario before looking for a memorised answer.
✗
It pushes interface operational status changes to a receiver using UDP.
The receiver is configured to listen on port 2000 using TCP.
Why it's wrong here
Receiver is the destination, not a listener.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between subscription configuration details (e.g., destination IP/port) and the actual transport protocol or encoding used, leading candidates to incorrectly assume that a port number implies a specific protocol (like UDP) or that YANG-push always uses XML encoding.
Detailed technical explanation
How to think about this question
YANG-push (RFC 8641) allows network devices to push updates for YANG-defined data nodes to a receiver, using either periodic or on-change subscriptions. The subscription configuration in the exhibit likely includes a 'subscription-id', 'stream' (e.g., 'YANG-push'), and 'receiver' details, where the destination port (e.g., 2000) is often used for gRPC-based telemetry receivers that listen on TCP. In real-world scenarios, this enables efficient monitoring of interface state changes without polling, reducing network overhead and providing near-real-time visibility.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Cisco Platforms and Development — This question tests Cisco Platforms and Development — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It subscribes to YANG-push notifications for interface state data. — Option A is correct because the subscription configuration uses YANG-push notifications to stream interface state data. The presence of a subscription ID, a YANG-push filter (e.g., 'ietf-interfaces:interfaces-state'), and a destination group (e.g., '10.1.1.1:2000') indicates that the device is configured to push telemetry data for interface operational state changes to a receiver using the YANG-push model, which is a standard mechanism for streaming data from network devices.
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.
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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