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module02 - Module 2 Application layer Preview In this...

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Module 2: Application layer Preview In this module, you study the application layer of the five-layer Internet model of networking. The application layer represents the networked software applications that an organization uses for communication and data transfer. This layer is presented first for two reasons: First, conceptually it is an easier starting point because of the familiarity that most people have with network applications. Second, it is the application layer that drives the need for networks in the first place. From a business perspective, applications that run on the network provide the key support for the business processes that are defined by the organization’s goals and mission. The module begins with an overview of the different application architectures, which describe the options for spreading the application functions across the network. You also explore a variety of familiar and not-so-familiar applications that operate in a networked environment. The module concludes by considering the implications that the application layer has for management. Knowledge objectives z Explain what is meant by the term "packet." z Differentiate between clients and servers. z Describe four types of computers that are commonly used as servers and six types of computers that are commonly used as clients. z Define the four functions of an application. z Describe the various application architectures that can be used to set up networks. z Distinguish between two-tier, three-tier, and n-tier architectures. z Compare thin clients and fat clients. z Describe the key factors that are relevant in choosing an application architecture. z Explain how the Web works. z Explain how e-mail works. z Explain and differentiate between SMTP, POP, and IMAP. z Describe Listserv discussion groups. Skill competencies z Select the most appropriate application architecture for a particular business situation. z Propose how FTP, Telnet, instant messaging, and videoconferencing can be used to support business processes.
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Professional values z Evaluate situations where e-mail would or would not be appropriate. z Contrast the common rules of memos and those of e-mail as business correspondence. z Assess the implications for management that relate to the application layer. Topics 2.1 Application architectures 2.2 World Wide Web 2.3 Electronic mail 2.4 Other applications 2.5 Implications for management Assignment preview At the end of this module, you will be required to complete (and submit for marking) an assignment comprising multiple-choice, issue/scenario, and online research questions. You may need to go online to do some research in order to be able to complete some questions. Reading and resources z It is best to study this module topic-by-topic, reading the assigned text pages for a topic first, and then reading the topic itself — unless directed otherwise.
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