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Week 5 Assignment

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ISSC340 Week 5 Assignment (3% of Grade)

Lesson 5 Review: Networking Models, Traffic and Devices
The purpose of this activity is to reinforce what you have learned so far about local area networks technologies.

1. Describe the three modes of communication available on a network. (Minimum word count: 60)
Simplex Data travels in only one direction, similar to a public address (PA) system.
Half-duplex Data travels in two directions, but in only one direction at a time, similar to a walkie-talkie. Traditional shared Ethernet uses half-duplex transmissions.
Full-duplex Data travels in two directions simultaneously, similar to a phone conversation. Full-duplex Ethernet (or switched Ethernet) supports full- duplex transmissions in a switched environment.
2. List the seven layers of the OSI model, including both layer number and name for each. (Minimum word count: 20) The OSI/RM consists of the seven layers Application 7, Presentation 6, Session 5, Transport 4, Network3, Data Link 2, and Physical 1.
3. Describe a protocol data unit (PDU). (Minimum word count: 30)
The PDU consists of the payload and the header from that layer. The next layer then treats the PDU from the previous layer as the payload, adds its header (creating a new PDU), and transferring it to the next layer.
4. List three practical functions of the OSI model. (Minimum word count: 60) The OSI/RM has three practical functions: It gives developers necessary, universal concepts so they can develop and perfect protocols that can work with operating systems and network products developed by other vendors. It explains the framework used to connect different types of systems. That is, it allows clients and servers to communicate even if they are using different applications and operating systems; all they need is a common protocol, such as TCP/IP. It describes the

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