Title: Lab Exercise Two
Course: CNT 2001 Computer Networks & Communications > Section: Module 2 The OSI and TCP/IP Models

Topic 02: The OSI and TCP/IP Models

Create a short essay (1 to 3 pages) that examines a scenario and compares several significant protocols that are used in this scenario and the layers of the OSI model that support them.

In this scenario, a user is surfing the web using a web browser (the make and model of the browser is irrelevant).   The user visits the President’s website at http://www.whitehouse .gov.  Examine the user’s request for the home page at http://www.whitehouse .gov, starting with the Application layer, and progressing down through the OSI Model to the Transport layer, the Network layer, and the Data Link layer.  Include in your analysis the protocols that are in use at each layer, and include a discussion of the information that is found in the protocol headers at each layer.  Differentiate between the protocols that are invoked, and compare the different services that each of the different protocols support.

Discuss the use of encapsulation at each of the layers, and create a diagram that illustrates the encapsulation.  Be sure that your diagram clearly shows the construction of the appropriate headers (and trailer, when appropriate).  You can assume that Ethernet is in use at the Data Link layer.  You are only responsible for an examination and discussion of the Application layer, the Transport layer, the Network layer, and the Data Link layer.  You can ignore the other layers of the OSI model in your analysis.

Include your references at the end of your essay.