Homework Friday, September 26th

Pg. 170-171 # 1-3

1.) A intranet is a private network which is based on the internet. it is only accessable to the ones who are part of the organization. The difference between an internet and the intranet is that the internet iis accessable to anyone who has the internet connection. But the intranet is only accessable for the people who are in the organization. The intranet is used in several ways. Most of the schools are setting up their own intranets. The biggest reason is the timetables, room changes, sports teams and results can be shared with the student and staff.

2.) The difference between extranets and intranets are that the intranet can only be accessed by the people who are in the certain organization. But the extranets can be accessed by outsiders with a valid username and password, but they only have limited access.

3.) EDI (electronic data interchange) is a special way to transfer buisness documents. For example orders and invoices between computers. e-commerce is used for the term, buying and selling goods and services on the internet, in particular the World Wibe Web.

IT Homework for Sep. 16

Pg. 164-165 #1-5

1.) A telecommunication is a name given or sending and receiving  data through wires, optical fibers  or radio waves. It also involves communications over great distance. It includes sending and receiving the computer data, television pictures, images, voice, sound and faxes. 

2.) The satellites send and receive data by using microwaves. Some are used for sending and receiving phone calls, television pictures and computer data, while others are dedicated to certain tasks. A communications satellite receives signals sent from a ground-based station then it gets simplifies. 

3.) It consists of a transmitter, a transmission channel and a receiver. First in converts the data collected to which enables it to be sent over wires or optical fibers or by radio waves to the receiver. It converts the data to a form that can be understood by a person or machine. 

4.) The Process Is pretty simple. It is when the analogue signals are converted to digital signals. This process occurs because many digital signals can be squeeze d into the analogue signals. The digital signals are more reliable and higher quality transmission than analogue. The equipment used for digital signals are also cheaper.

5.) The advantage of using the Bluetooth is that it’s a wireless hand held technology devise. For example mobile phones, computers, and more.

Pg. 166-167 #1-5

1.) A dial-up network is where the computer is connected to the internet with a modern. The dial up connections are the cheapest but also slowest.

2.) ISDN is a high speed digital alternative to using the telephone network. T can send and receive data at 128 keps. But the ADSL transforms the data into big speed digital data lines. It can send and receive data faster than ISDN with the speed up to 8Mbps.

3.) The advantage is that the via cable is able to send and receive data at high speed. It’s a broadband service, so a cable can carry many channels.

4.) It is important to the Internet because it breaks down the data into little packets, which are sent to computers to the internet. It also makes the data that is reassembled into its normal form.

5.) IP is an address for numbers usual four. It is important because it can track the users internet usage.

Pg. 168-169 #1-5       

1.) I personally think that the one which says, research in finding more information and information on the web can be multimedia: that is, text, graphics, video, animation and sound. If we were enable to research and find information we need we will have to go to the library and look up books. Without information on the web we wont be able to download videos, movies, and pictures we need.

2.) Security

-       Downloading viruses.

-       Protection of copyright material

-       No control on information

-       Cost of computer equipment

-       Searching for information that is difficult 

3.)  The advantages of mail is that its quicker than postal mail, mails can be sent to more than one person at the same time. Also text messages can be sent to mobile phones. 

4.) Encryption is the process when you put data into a code to prevent accessing the data. Encryption is also used during the sending of files on the internet and the World Wide Web.

 

5.) A firewall is a security system that prevents hackers to access the network. It stops the computers on a network communicating directly with computer on the Internet. A proxy server is an outside the network. The proxy server is a gatekeeper. It filters internet sites and decides which files or messages should come in to or go out from a computer network.