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Exam 350-401 topic 1 question 448 discussion

Actual exam question from Cisco's 350-401
Question #: 448
Topic #: 1
[All 350-401 Questions]

A network monitoring system uses SNMP polling to record the statistics of router interfaces. The SNMP queries work as expected until an engineer installs a new interface and reloads the router. After this action, all SNMP queries for the router fail. What is the cause of this issue?

  • A. The SNMP interface index changed after reboot.
  • B. The SNMP server traps are disabled for the link state.
  • C. The SNMP server traps are disabled for the interface index.
  • D. The SNMP community is configured incorrectly.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by kebkim at Sept. 19, 2022, 2:12 p.m.

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jhonmeikel
1 year, 6 months ago
In Cisco IOS, there is a command snmp-server ifindex persist, which tells IOS to keep ifindex value unchanged even after reboot
upvoted 1 times
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danman32
1 year, 6 months ago
Question scenario says SNMP polling is being used so that eliminates answers B and C that reference SNMP traps. Traps are a push, polling is a pull.
upvoted 4 times
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danman32
1 year, 6 months ago
I would have loved to say configuration wasn't saved after the SNMP was configured, that's why after reboot SNMP didn't work. But barring that, only thing that would change after an interface is added is SNMP interface indexes.
upvoted 3 times
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jzzmth
2 years, 1 month ago
Cisco is probably looking for answer A, but wouldn't D also be a possibility if the start-up config contained a wrong community string?
upvoted 3 times
danman32
1 year, 6 months ago
I think you can assume the running-config and startup-config are the same, other than the interface change that was mentioned in the question.
upvoted 1 times
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nushadu
2 years, 1 month ago
Selected Answer: A
https://www.cisco.com/en/US/docs/general/Test/dwerblo/broken_guide/ifindx.html
upvoted 4 times
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kebkim
2 years, 4 months ago
SNMP interface index : One of the most commonly used identifiers in SNMP-based network management applications is the Interface Index (ifIndex) value. IfIndex is a unique identifying number associated with a physical or logical interface. For most software, the ifIndex is the name of the interface.
upvoted 1 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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