Trabajo de Redes

1. Trabajo de Redes Carolina Izquierdo Melero 1ºB

2. Comunication methods A Choose just one answer: a, b, c or d.

3. B • What software is used to display web pages? • a) State four reasons why e-mail is often prefered over other methods • of communication . • -Is very cheap to send, it can be picked up anywhere in the world, you can • Attach any computer file to an e-mail and is very quich delivery. • b) Describe two drawbacks of e-mail. • It is not secure, you might get a lot of spam. • 2. Describe three reasons why a business may want to comunicate with • its customers via web pages. • You can talk with many users at the same time. • You can personalize your web page • It can be private • 3.Explain why video conferencing is best achieved with a broadband • connection. • Because you can see and hear each other, with people in different places in • the world, and it is a treatment personalized with the people.

4. C • These are GCSE-style questions. Answer all the questions. • A busines traveller is staying in a hotel in England. He has to keep in touch • With his office from time to time. His son is back-packing in Australia. Many • Methods of communication are available. For each of the following situations, • State a suitable method of communication and give a reason for your choice. • 2. Explain two reasons why a home can benefit from connection to satelite communication sytems • Lots of data can be sent simultaneously. Useful for private and business • communication as well as television channels

5. Data transfer A Choose just one answer: a, b, c or d.

6. B • Answer all parts of all questions. • a) Data is often sent over networks in a compressed form. Explain what • this means and the advantage of doing it. • Send data in a compressed form is faste then send data in a normal form. • b) The following are commonly used compression standards. For each one, • State what sort of file is being compressed. • 2. Explain why is often a good idea to limit the amount of graphics used on • a web page. • Limiting graphics reduces download times. • Many users can access at the same time to your web page • 3. a) A modern is advertised as being 56 Kbps. How long is the shortest time that it • would take to download a file of 1 MB? Show your working. • 56 Kbps=1.000 bps 1MB=1.000.000 bps1000 seconds • b) In practice, the 1MB file may take longer than this to download. Explain one reason • Why this might be the case. • Many users are trying to download this file at the same time.

7. C • These are GSCE-style questions. Answer all parts of all questions. • A small college uses a 3-station client-server network fot its administration. • the computers are connected by bus cable. Recently, with increasing student • numbers, the office staff have noticed that the network performance has • slowed down. • a) Network topology (layout). • It might can cause collisions. Solutions: change the bus cable for other cable. • b) The network cards. • Networks cards have their own maximun speeds. Solution: buy better cards than this • cards. • c) The specification of the server. • If the server has only a small amount of RAM it won’t be able to serve many users as • quickly. Solution: give the server more RAM. • 2. Explain why network performance can be improved by storing commonly • Used applications on local hard drives rather than on the server. • 3. An ISP (Internet Service Provider) needs to have servers with a high • Specification. Explain what this means and why it is important in this case. • An ISP needs to have servers, this servers needs to have a high specification, • because this one servers with a lor of RAM, and it will be able to server many users as • quickly.