Big Idea 4 · Topic 4.2 · Exercise 1
Outage Post-Mortem: The SnackDash Blackout
25 minutes
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Q1 · 3 points on the handout
During the whole outage, customers across the country could still BROWSE the SnackDash website, hosted on cloud servers far from the warehouse - packets kept arriving even while a regional fiber line was down. Explain how the Internet's engineering made that possible, and name the TWO payoffs EK CSN-1.E.7 says redundant routing provides.
Q2 · 3 points on the handout
A teammate proposes buying the second fiber line but laying it in the same trench as the first, 'so the crew only has to dig once.' Rule on the proposal.
Q3 · 2 points on the handout
ENRICHMENT: In graph terms, a link whose removal disconnects part of a network is called a bridge. Identify the bridge in SnackDash's original network, explain how the stage-4 hotspot changed the graph, and describe the cheapest set of additions that would leave the company with NO bridges.
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