Exercise 1: Diagnosing Scenario 1's Connection Failure as a VPN Issue — Possible Solution
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WHAT HAPPENED IN THE SCENARIO
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Per this chapter, "the first attempt to reach the bastion times out.
Rather than assuming an SSH problem, the checklist runs first: other
services reach fine, and the cause turns out to be a quietly-expired
VPN session - reconnecting the VPN resolves it immediately, confirming
this was never an SSH-specific issue at all."

THE CHAPTER THIS REASONING CAME FROM
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This is a direct application of Chapter 8's own ordered checklist for
"When the Connection Itself Is the Problem." Chapter 8 established
that a failure which *looks* like an SSH problem should be worked
through an ordered checklist rather than assumed to be SSH's own
fault first - checking whether the issue is actually one layer
earlier (network/VPN reachability) before assuming it's the
application (SSH) itself.

WHY "OTHER SERVICES REACH FINE" WAS THE KEY DIAGNOSTIC STEP
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If SSH itself were broken (a bad key, a misconfigured server, a
firewall rule blocking port 22 specifically), other services should
still work normally. Because *everything* going through the VPN was
affected, not just SSH, that pointed the checklist away from
SSH-specific causes and toward something shared underneath all of
them - the VPN session itself. This is the same "check the earliest
layer first" discipline Chapter 8 taught, applied concretely.

WHY THIS AVOIDED WASTED TIME
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Assuming an SSH-specific cause first (bad key, wrong host, server-side
config) would have led to checking the wrong layer entirely, since the
real problem was one step earlier in the connection path. Confirming
the VPN session had expired and reconnecting it fixed the symptom
immediately, with no SSH-specific troubleshooting ever needed.

WHY THIS WORKS AS AN ANSWER
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It identifies the specific evidence (other services also failing)
that pointed away from SSH itself, names Chapter 8 as the source of
the ordered-checklist reasoning used, and explains why checking the
shared underlying layer first was the efficient path to the real
cause.