Exercise 1: An INI Inventory for cacheservers — Possible Solution
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[cacheservers]
cache1.example.com
cache2.example.com

[cacheservers:vars]
redis_port=6379

Explanation:

This follows the chapter's own webservers/dbservers example exactly:
a bracketed group header ([cacheservers]) with the two hosts listed
underneath it, one per line, and a separate [cacheservers:vars]
section attaching redis_port=6379 to every host in that group at
once, using the same :vars suffix pattern the chapter's own
http_port=80 example demonstrated for the webservers group. Both
cache1.example.com and cache2.example.com automatically receive
redis_port=6379 without it needing to be repeated per host.

WHY THIS WORKS AS AN ANSWER
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This builds a correctly structured INI inventory using the exact
group-header-plus-:vars-suffix pattern shown in the chapter, matching
the exercise's own specific host names, group name, and variable
requirement.