The very basic things any executive should know about IT infrastructure.
Table of contents bellow. More about the author at https://germanretana.net.

Links in video:
Inside Google Data Center    • Inside a Google data center  
IBM zEnterprise System    • Video  

TABLE OF CONTENTS
0:49 Data Center
2:30 The System Administrator
4:05 Elements in a LAN
4:41 Servers: Functions and Names
8:25 Servers: Mainframe
9:15 Severs: High Availability Server
10:24 Severs: Cluster
12:09 Severs: Virtual Servers
14:52 Clients
17:06 Network Devices
20:15 Communication Media: Wired - Cable
21:58 Communication Media: Wireless
23:23 Example: INCAE
25:15 Types of Networks: Intro
25:40 Types of Networks: LAN
26:09 Types of Networks: Backbone
27:25 Types of Networks: MAN
29:42 Types of Networks: WAN
30:39 Intranet and Extranet