ICT questions

Topics: OSI model, Computer network, Internet Pages: 9 (1790 words) Published: February 2, 2014

Data communications systems and ICT innovations (Section 2)

In your own words, answer the following questions based on your notes, research and classroom discussions. You may require to use external sources to support your discussion. Please reference such external resources accordingly.

In your own words, discuss at least six examples of the benefits to organisations of computer networks over conventional communication methods.(6)

The beneits to organisations of omputer networks over conventional communication methods are

Reduces costs when compared to more traditional methods of communication. If information has to be sent to an organisation in another part of the country or world then the cost of sending an e-mail with an attached file is relatively cheap when compared to postal charges. Video conferencing allows people from different parts of the world to hold meetings electronically, saving the cost of travel and accommodation.

The speed that information is received is much faster using computers, and different time zones between countries are no longer a barrier to communication

Enables sharing and distribution of information. Promotes the coordination of activities between departments within organisations.

Enables the sharing of hardware on the network.

Networks also allow data to be exchanged with suppliers and online payment facilities, making them much more efficient.

It enables you to create links with customers and suppliers.

In your own words, discuss at least three examples of the disadvantages of using computer networks.(3)

Three disavantages of using computer networks are

Can depend to much on network.

Can be a major disruption when introducing networks and maintenance work.

Reduced security through wider access from wide area networks and the Internet.

Discuss the difference between a LAN and a WAN.(3)

The difference between a LAN and a WAN

A local area network is a network that connects computers within a limited geographical area, usually within a single office or building. These are the most Common types of network and are connected using direct cables. They do not require modems to connect through the telephone system like wide area networks do and each time the company expands it must expand the network.

Wide area networks, cover large geographical areas, for example Organisations based in different parts of a city, a different country or anywhere in the world. The Internet is a good example of a WAN.

Name the different types of twisted-pair cabling available today. (2)

Sheilded twisted pair (STP)
Unshielded twisted pair (UTP)

What is a network service provider and what are they used for? (3)

A network service provider is the company that provides the network connectivity to commercial ISPs and large organisations.

In your own words, discuss what is meant by a computer gateway. (3)
A computer that sends all traffic from a workstation to an outside network that serves web pages. For example, an individual using a PC at home connects to the Internet through an ISP – the ISP is the gateway that connects the user to the Internet.

What is the difference between a physical topology and a logical topology? (2) The difference between physical topology and logical topology is in perspective. A logical topology is how devices appear connected to the user. A physical topology is how the devices are actually interconnected with wires and cables.

What is another name for a star-bus topology?(1)

Another name for a star-bus topology is a tree topology.

What is SONET and in which type of network would you find it? (4)

Synchronous transport – SONET (Synchronous Optical Network)/ Synchronous Digital Hierarchy (SDH) Synchronous transport is a technology for carrying many...
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