Lesson 8

This module gave you a fundamental understanding of the five layers of the Web Interaction Model. By understanding the dynamics of each component of Web interaction, you will be able to make effective planning decisions for developing a Web site. The specifics of these decisions will be explored in the remaining modules in this course.
You should now be able to:

1. Explain the setup and purpose of the Internet, intranets, and extranets
2. Explain TCP, IP, HTTP, and FTP protocols
3. Explain how Web resources are transmitted across the Internet
4. Describe components of the hardware layer
5. Use the Web Interaction Model to explain how resources are requested and received via the Web
6. Explain how the Web-based business applications are supported by the Web Interaction Model

In this module, you were introduced to the following glossary terms:

• Connectivity: Connectivity refers to the ability of devices or systems to communicate with each other. It encompasses the methods and technologies that enable this communication, facilitating the exchange of data.
• Dedicated connection: A dedicated connection is a persistent, fixed-bandwidth link between two points, providing consistent and reliable data transfer. It is often used for high-demand applications requiring guaranteed performance.
• Dial-up connection: A dial-up connection establishes internet access by using a telephone line to connect to an ISP's server. It is a slower, older technology that uses the public switched telephone network (PSTN).
• Firewall: A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It helps protect networks from unauthorized access and malicious attacks.
• Hubs: Hubs are networking devices that connect multiple devices in a local area network (LAN) by broadcasting data to all connected devices. They are less efficient than switches, as they do not filter or direct traffic.
• Internet backbone: The internet backbone is the principal data routes between large, strategically interconnected computer networks and core routers on the Internet. It is the high-speed infrastructure that carries the majority of internet traffic.
• Internet Service Provider (ISP): An ISP is an organization that provides services for accessing, using, or participating in the Internet. They offer various connection types and services to individuals and businesses.
• LAN (local area network): A LAN is a network that connects computers and devices within a limited area, such as a home, school, or office building. It enables resource sharing and communication among connected devices.
• Modem: A modem is a device that modulates and demodulates signals, enabling digital data to be transmitted over analog telephone lines or other communication channels. It converts digital signals from a computer into analog signals for transmission, and vice versa.
• NIC (Network Interface Card): An NIC is a computer hardware component that connects a computer to a network, enabling it to communicate with other devices. It provides the physical interface between the computer and the network medium.
• Pipeline: In networking, a pipeline refers to the capacity or bandwidth available for data transmission, often used metaphorically. It represents the data flow rate that a connection can handle.
• Routers: Routers are networking devices that forward data packets between computer networks, directing traffic to its intended destination. They analyze network traffic to determine the best path for data transmission.

In the next module, you will learn about a useful design model that describes the various responsibilities and steps for planning your Web site.