Answer:
1. Clients and servers—how services such as e-mail and web pages connect using networks.
2. IP addresses—how devices on a network can be found.
3. Network hubs, switches and cables—the hardware building blocks of any network.
4. Routers and firewalls—how to organize and control the flow of traffic on a network.
<em>Shift </em>selects multiple worksheets at the same time. <em>Ctrl</em> selects all that you selected with Ctrl pressed.
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