LAN Transmission Media

The communications medium is the medium across which data communications occur between two computing devices.

There are two categories of communications medium: wire medium and wireless medium. Wire medium uses a physical medium to transmit the data over, whereas a wireless medium uses electromagnetic waves to transmit the data, and do so through the air.

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Web Page Design

While web site design deals with the structure and content of your entire site, web page design deals with the content and layout of the individual pages within your site. Web page design is concerned with what goes on the individual pages, how it is placed on the page, and where it is placed on the page.

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Messages

Software objects interact and communicate with each other by sending messages to each other. When object A wants object B to perform one of B's methods, object A sends a message to object B as shown in the following figure (diagram from The Java Tutorial):

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