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Computer to Computer: Summary

Computer communications can be simple - a cable between two computers. Or it can be very complex - one computer connecting to another over the Internet on the other side of the world. Many different media can be involved - phone lines, data lines, microwaves, radio, infrared, or satellite uplinks.

Computers are digital but phone lines are analog. A modem converts the signal between these two types of transmission. Digital modems don't actually have to translate, but are called modems anyway - cable modems, ISDN, and DSL.

Computer needs software for communicating. A dialing program connects to an analog modem. FTP program transfers files. Terminal emulation convinces a network that your computer is one of its own terminals. Encryption keeps your data safe from prying eyes and ears as it is transmitted.

A network lets multiple computers share hardware and files and even programs. A LAN is a local area network. A WAN is a wide area network.

Many networks are in a star configuration where one computer is the server and handles all of the communication between the computers. It may handle most of the processing itself. A bus network connects computers and other hardware to a communication line. Each computer can contact any other computer or device that is connected to the network bus line. A ring network connects all computers in a circle. When one computer is down, the network is down. A router or bridge connects two networks together.

A file server receives requests for files and sends the whole file (no matter how large) to the computer that asked for it. That computer does the processing to answer the question and prepare a report.

A client server receives a question and uses it own processor and files to answer the question and send the answer back to the computer that asked.

Computer to Computer: Quiz

For each question, click on the radio button beside your answer. You will be notified immediately whether your choice is correct or not. Double clicking may work better.

Top of Form

1. The path that data travels between two computers is NOT called a _____.

communications channel

communications link

communications line

communications bridge

none of the above

2. Twisted wire, coaxial cable, and microwave are types of transmission _____.

chains

media

data

information

3. Fiber optics have the advantage of _____.

being cheaper to install

being easier to install than twisted wire

having no interference

using direct line-of-sight

4. A modem is used to _____.

a. change incoming analog signals to digital signals and outgoing digital signals to analog signals

b. connect two computers using telephone lines

c. connect two computers using a satellite uplink

d. connect a computer to a shared printer

both a and b

both b and d

5. The line that is most often used for telephones is _____.

twisted pair

coaxial cable

fiber optics

none of the above

6. To move a copy of a file from one computer to another over a communications channel is called _____.



file compression

file encryption

terminal emulation

file transfer

7. A LAN is a _____ network.

Long Array

Local Area

Land Access

Line Area

none of the above

8. Sharing of hardware resources like a scanner could be done with _____.

LAN

WAN

Internet

all of the above

9. In a File-Server arrangement, the PC _____.

does the processing of the data into information

does none of the processing of data into information

searches the server for data

sends the results of a search to the server

10. An airline reservations network would most likely be in a _____ configuration.

star

bus

ring

gateway


Date: 2015-01-11; view: 1147


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