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Chapter 3: Networking
Illustrations contained in this document are for representation only.
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Chapter 3: Networking
Communications
Data communication involves the flow of packets of data from one device to another. These
devices include personal computers, Ethernet and USB hubs, cable modems, digital routers
and switches, and highly integrated devices that combine functions, like the Wireless Cable
Gateway.
The gateway integrates the functionality often found in two separate devices into one. It’s
both a cable modem and an intelligent wireless gateway networking device that can provide a
host of networking features, such as NAT and firewall. Figure 2 illustrates this concept, with
the cable modem (CM) functionality on the left, and networking functionality on the right. In
this figure, the numbered arrows represent communication based on source and destination,
as follows:
Type of Communication
1. Communication between the Internet and your PCs
Example: The packets created by your request for a page stored at a web site, and the
contents of that page sent to your PC.
2. Communication between your cable company and the cable modem side
Example: When your cable modem starts up, it must initialize with the cable company,
which requires the cable company to communicate directly with the cable modem itself.
3. Communication between your PCs and the networking side
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