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300-410 Practice Question: Which TWO statements about SNMPv3 engine ID…
Which TWO statements about SNMPv3 engine ID configuration are true? (Choose TWO.)
⚠ Common exam trap
Cisco often tests the misconception that the engine ID is based on the router's serial number, but it is actually derived from the MAC address or IP address, and the maximum length is 27 octets, not 64.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
If the engine ID is changed, all existing SNMPv3 users must be reconfigured.
The SNMPv3 engine ID is a key component in generating the authentication and encryption keys for each user. If the engine ID changes, the keys derived from it become invalid, requiring all existing SNMPv3 users to be reconfigured with new passwords or keys to re-establish secure communication.
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 engine ID must be manually configured for SNMPv3 to function.
Why it's wrong here
The engine ID is automatically generated if not manually configured; manual configuration is optional.
- ✓
If the engine ID is changed, all existing SNMPv3 users must be reconfigured.
Why this is correct
Changing the engine ID invalidates the authentication and encryption keys derived from the old engine ID, requiring users to be reconfigured.
- ✓
The engine ID is used to generate the authentication and encryption keys for SNMPv3 users.
Why this is correct
SNMPv3 keys are derived from the user password and the engine ID using a key derivation algorithm.
- ✗
The engine ID can be up to 64 octets in length.
Why it's wrong here
The SNMP engine ID is a maximum of 32 octets (bytes) in length, not 64.
- ✗
The engine ID is automatically generated based on the router's serial number.
Why it's wrong here
The engine ID is automatically generated based on the router's MAC address, not the serial number.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.