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Date	Provider	Score	Summary
31 Aug 2026, 2:30 PM	The Register	3.0	Who, me? Techie with three months' experience was sent in as the Cisco expert and proceeded to blow everything up A 'Who, Me?' column shares a reader's confession about being sent as the 'Cisco expert' with only three months' experience to a customer running Nortel kit. After racking a new switch and configuring VLANs, his spanning-tree settings dropped over 4,000 AS/400 sessions, which the customer's IT team had to kill manually one by one because SNA-over-TCP/IP emulation couldn't tolerate a single lost packet. Why: A relatable cautionary tale about imposter syndrome meets real-world blast radius: a single misconfigured spanning-tree setting on one switch took out thousands of production sessions. The practical lesson is to verify protocol-level tolerances (e.g., packet-loss sensitivity of legacy emulated sessions) before plugging new gear into a live network, and to push back when sent into unfamiliar territory. networking war-story spanning-tree imposter-syndrome

Date

Provider

Score

Summary

31 Aug 2026, 2:30 PM

The Register

3.0

Who, me? Techie with three months' experience was sent in as the Cisco expert and proceeded to blow everything up

A 'Who, Me?' column shares a reader's confession about being sent as the 'Cisco expert' with only three months' experience to a customer running Nortel kit. After racking a new switch and configuring VLANs, his spanning-tree settings dropped over 4,000 AS/400 sessions, which the customer's IT team had to kill manually one by one because SNA-over-TCP/IP emulation couldn't tolerate a single lost packet.

Why: A relatable cautionary tale about imposter syndrome meets real-world blast radius: a single misconfigured spanning-tree setting on one switch took out thousands of production sessions. The practical lesson is to verify protocol-level tolerances (e.g., packet-loss sensitivity of legacy emulated sessions) before plugging new gear into a live network, and to push back when sent into unfamiliar territory.