350-401 · Question #782
Which circumstance can cause interface overruns?
The correct answer is A. microbursts. Interface overruns are commonly caused by microbursts, which are sudden, intense bursts of traffic that overwhelm an interface's input buffer faster than it can process data.
Question
Which circumstance can cause interface overruns?
Options
- Amicrobursts
- Basymmetric routing
- Cout-of-order packets
- Dfragmentation
How the community answered
(35 responses)- A86% (30)
- B3% (1)
- C9% (3)
- D3% (1)
Why each option
Interface overruns are commonly caused by microbursts, which are sudden, intense bursts of traffic that overwhelm an interface's input buffer faster than it can process data.
Microbursts are sudden, very high-rate bursts of traffic that can temporarily overwhelm an interface's input buffer, causing packets to be dropped before they can be processed, which is reported as an overrun.
Asymmetric routing involves traffic taking different paths for inbound and outbound communication but does not directly cause interface overruns on a specific interface.
Concept tested: Interface error counters (overruns), network congestion causes
Source: https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/200720-Troubleshoot-Input-Queue-Drops-and-Overru.html
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