Quick Answer
The answer is 1 to 1023. This default ERSPAN ID range exists because the session ID field in the ERSPAN header is a 10-bit value, allowing for 1024 possible identifiers, with 0 typically reserved, leaving 1 through 1023 available for configuration. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how Encapsulated Remote Switched Port Analyzer sessions are uniquely identified across a Layer 3 network; a common trap is assuming the range is 1 to 256 for all platforms, which applies only to older hardware or specific software versions. The exam may present a scenario where you must verify or configure an ERSPAN session, and forgetting the default ID of 1 if none is specified could lead to misidentification. To lock this in, remember the mnemonic: "ERSPAN IDs go up to 1023, just like a 10-bit binary tree."
This 300-410 practice question tests your understanding of span, rspan, and erspan. 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.
What is the default ERSPAN ID range on Cisco IOS-XE devices?
1 to 256
Why wrong: 256 is the limit for some older platforms, but modern IOS-XE supports up to 1023.
1 to 1023
The ERSPAN ID range is 1 to 1023 on most Cisco IOS-XE platforms.
1 to 4096
Why wrong: 4096 is the VLAN range, not ERSPAN ID.
1 to 65535
Why wrong: 65535 is too large; ERSPAN ID is limited to 1023.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
1 to 1023
ERSPAN sessions use an ID from 1 to 1023 (or 1 to 256 on some platforms) to identify the session. The default is 1 if not specified.
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.
1 to 256
Why it's wrong here
256 is the limit for some older platforms, but modern IOS-XE supports up to 1023.
1 to 1023
Why this is correct
The ERSPAN ID range is 1 to 1023 on most Cisco IOS-XE platforms.
Related concept
Read the scenario before looking for a memorised answer.
1 to 4096
Why it's wrong here
4096 is the VLAN range, not ERSPAN ID.
1 to 65535
Why it's wrong here
65535 is too large; ERSPAN ID is limited to 1023.
Common exam traps
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.
Detailed technical explanation
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.
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 300-410 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 300-410 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.
SPAN, RSPAN, and ERSPAN — study guide chapter
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SPAN, RSPAN, and ERSPAN practice questions
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FAQ
SPAN, RSPAN, and ERSPAN — This question tests SPAN, RSPAN, and ERSPAN — Read the scenario before looking for a memorised answer..
The correct answer is: 1 to 1023 — ERSPAN sessions use an ID from 1 to 1023 (or 1 to 256 on some platforms) to identify the session. The default is 1 if not specified.
Identify which 300-410 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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 19, 2026
This 300-410 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 300-410 exam.
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