Quick Answer
The answer is HTTP 429 indicates rate limiting. This status code, defined in RFC 6585 as "Too Many Requests," means the server is deliberately rejecting requests because the client has exceeded a predefined threshold of requests within a specific time window. In network automation, devices like routers and switches enforce these rate limits to prevent resource exhaustion and ensure fair usage, making it a critical concept for the Cisco DevNet Associate 200-901 exam. This exam tests your understanding of API response handling and error recovery, often presenting HTTP 429 as a scenario where automation scripts must implement retry logic with exponential backoff rather than simply resending requests. A common trap is confusing 429 with 503 (Service Unavailable), but remember: 429 is client-side throttling, while 503 is server-side overload. For a quick memory tip, think "429 = 4 too many, 2 fast, 9 times out of 10 you need to back off."
This 200-901 practice question tests your understanding of infrastructure and automation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
During an automation script run, a network device returns HTTP 429. What does this indicate?
Internal server error
Why wrong: 500 is internal server error.
Rate limiting
429 means rate limit exceeded.
Authentication failure
Why wrong: 401 is authentication failure.
Resource not found
Why wrong: 404 is not found.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Rate limiting
HTTP 429 (Too Many Requests) indicates the client has sent too many requests in a given amount of time, triggering rate limiting on the server. In network automation, devices like routers or switches enforce rate limits to prevent resource exhaustion, often based on RFC 6585. This is common when automation scripts exceed API call thresholds, requiring retry logic with exponential backoff.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Internal server error
Why it's wrong here
500 is internal server error.
Rate limiting
Why this is correct
429 means rate limit exceeded.
Related concept
Read the scenario before looking for a memorised answer.
Authentication failure
Why it's wrong here
401 is authentication failure.
Resource not found
Why it's wrong here
404 is not found.
Common exam traps
Cisco often tests HTTP 429 to distinguish it from HTTP 503 (Service Unavailable), which is a server overload but not specifically a client rate limit, and candidates may confuse the two due to both involving temporary unavailability.
Detailed technical explanation
Rate limiting is often implemented using token bucket or leaky bucket algorithms, where the server tracks request counts per client IP or API key. In Cisco IOS-XE or NX-OS, the RESTCONF or NETCONF interface may return a 429 with a Retry-After header specifying the wait time in seconds. Real-world automation scripts must handle this by implementing retry logic with jitter to avoid synchronized retries that worsen congestion.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-901 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Infrastructure and Automation — This question tests Infrastructure and Automation — Read the scenario before looking for a memorised answer..
The correct answer is: Rate limiting — HTTP 429 (Too Many Requests) indicates the client has sent too many requests in a given amount of time, triggering rate limiting on the server. In network automation, devices like routers or switches enforce rate limits to prevent resource exhaustion, often based on RFC 6585. This is common when automation scripts exceed API call thresholds, requiring retry logic with exponential backoff.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This 200-901 practice question is part of Courseiva's free Cisco 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 200-901 exam.
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