Essay: Local Area Networks

Sample Essay

Words 1,432

PLEASE answer the question below with a minimum 5 sentences for each question. I will upload the book and that it will be the resource/reference that you going to use NO other one. Here are the questions:

1- How does shielded wire prevent EMI and RFI? (Minimum 5 sentences)

Shielded wire usually consist wiring wrapped in a metal sheath. This sheath offers protection to copper conductors carrying the signal from EMI and RFI. The metal shielding absorbs all spurious signals. These spurious signals are then grounded. The protection to this metal sheath is usually provided by Teflon jacket on top it (Computer Prep, 2002).

2- What is the difference between standard voice-grade cabling and data-grade cabling? (Minimum 5 sentences)

The difference between standard voice-grade cabling and data-grade cabling is of distance and speeds. For example, voice grade twisted pair cable can support speeds of up to 19Kbps for distances up to 6 miles. However, the maximum cable length for the cable is defined by network specification. Data grade cables support much higher speeds. The current limit for data grade cable is 100 Mbps for commonly used twisted pair wire (Computer Prep, 2002).

 

3- How is coaxial cable usually grounded? (Minimum 5 sentences)

A Coaxial cable is mad up of copper conductor which is protected by three layers of insulation. These layers are Dielectric insulator, Metal jacket and Polyethylene cover. Dielectric insulator is used to separate the core of the cable from upper layer. The Polyethylene cover provides protection to the inner layer. The metal jacket layer in the middle is made up of braided copper or aluminum. This layer acts as ground for the cable (Computer Prep, 2002).

4-Describe the OSI reference model. (Minimum 5 sentences)

The Open Systems Interconnection (OSI) reference model provides guidance on the design and implementation of protocol stacks. The OSI reference model uses a seven-layer approach for this purpose. Each layers of this model sets out a particular set of actions that must be done before the data is passed to the next layer. Each of the layer also add additional layer specific information to the data as it is passed through it. The seven layers of OSI model are Application, Presentation, Session, Transport, Network, Data Link and Physical (Computer Prep, 2002).

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