Tuesday, September 23, 2008

Tech Guide 4 - Week 7

Tech Guide 4 Questions

1. Compare and contrast the main wired communications channels ? (Ethernet & Fibre Optic)

There are three main types of cables including Twisted-pair wire which is the most common form of wire cable main because it is inexpensive, easy to work with and unobtrusive, but it is slow as it has a low bandwidth and is subject to interfenance. Coaxial Cable is just insulated copper wire that is used oposed to twiseted-pair wire as it has a higher bandwidth and is less susceptible to electreical interferance, but it is relatively expense and inflexible and also difficult to work with when compared to twiseted-pair wire. Fiber Optic Cables consist of thousands of small, thin glass filaments that send information via light pulses. It is prefered as it is smaller and lighter then traditional cables and has a very high bandwidth, but it needs amplifiers every few kilometers to increase the signal strength and it can be expensive when alot is used.

2. Describe the two technologies that enable users to send high-volume data over any network. (ISDN & ADSL)

Integrated Services Digital Network(ISDN) and Asymmetric Digital Subscriber Lines(ADSL) enable users to send high0volume data over any network. ISDN is an old and outdated technology that uses telephone lines whereas ADSL sends digitial signals though existing phonelines allowing the phone to be in use when someone is using the internet.

3. What are the main business reasons for using networks?

The main business reasons for using netoworks include:

  1. It connects all the computers in a business via commucations media allowing data to be transmitted to all the users in the business simultanoioulsy

  2. Allows all the users to access all the information that is stored on the network instead of cluttering up the users on PC.

  3. It also alows flexibility as the business can adapt to rapidly changing business conditions.

  4. Networks are a critical link between the business and its customers.

4. What is the difference between LANs and WANs?

A LAN is a local area network that conects devices in a limited geographical location.

A WAN is a wide are network which allows users to transmit and receive data over large geographic locations.

5. What is a network protocol?

Network protocol is a set of procedure and rules that govern the transmission of information across a network.

6. Describe TCP/IP protocol.

TCP/IP protocol is the transmission control protocol/Internet protocol which is the protocol of the internet. It managers the movement, sequence and aknowledges the receivement of packages sent across the net.

7. Describe the various ways that you can connect to the Internet?

You can connect to the internet via LANs, WANs, ADSL, Dialup, and broadband

8. Describe the parts of an Internet address.

Protocal - Domain Name - Webpage

9.What are the roles of browsers?

Browsers are software applications through which users primarily access the web and allows users to search the entire web for data and information relevant to their search.

10.Describe the difference between the Internet and the World Wide Web?

The internet is a massive network that globally connects computer networks quickly, inexpensively and effortlessly. Where as the World Wide Web (WWW) is a system of universal acceptance standards for storing, receiving, formatting and displaying information using various functions on the internet.

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