Knowledge sharing about Computer Network

I would like to record my learning pace from the Computer Network Course here too. Learning should be based on interest. And I would like to develop my study interest through a series of doing after-class reflection. Computer network should have connection with the Web design and engineering at some point. And that is why I chooese to write something related out of the syllabus.

Now, I understand the key difference between a LAN and a WAN. A LAN (local area network) is a group of computers and network devices connected together, usually within the same building
A WAN (wide area network), is not restricted to a geographical location. A WAN connects several LANs, and may be limited to an enterprise (a corporation or an organization) or accessible to the public. The technology is high speed and relatively cost-expensive.

The reason for the LANS to base on broadcast but not WANs do so is their nature difference that accounts. For LANs, it only connects to one central point which requires to receive data only. But for WANs, the whole network requires not only data receive but also the sending action. This question actually leads to the second question.

Voice transmission are real-time but data transmission are error-free. The technology are specialized in separate network due to the nature difference. As what has mentioned previously, the nature difference tells us that we should utilize resource to its full dimension since data request from the access point is limited with the increasing demands.