1.1 Data Communications Networks

Question 1

is the movement of computer information from one point to another by means of electrical or optical transmission systems

Answer 1

Data communications

Question 2

Includes the transmission of voice and video (images and graphics) as well as data and usually implies longer distances

Answer 2

Telecommunications

Question 3

They collect data from personal computers and other devices and transmit those data to a central server

Answer 3

Data communications networks

Question 4

They facilitate more efficient use of computers

Answer 4

Data communications networks

Question 5

Provide message transfer services

Answer 5

Data communications networks

Question 6

For data communications to occur, communicating devices must be part of a ________ system made up of a combination of ________ (physical equipment) and ________ (programs)

Answer 6

communication…hardware…software

Question 7

Data Communications Components:

Answer 7

1. Protocol
2. Sending Device
3. Channel or Medium
4. Receiving Device
5. Protocol

Question 8

The ________ is the information (or data) to be communicated

Answer 8

message

Question 9

Popular forms of information include:

Answer 9

1. Text
2. Numbers
3. Pictures/Images
4. Audio
5. Video

Question 10

The _______ is the device that sends the data messages

Answer 10

sender

Question 11

Can also be referred to as the source or as a device, the transmitter

Answer 11

Sender Component

Question 12

The device that receives the message from the sender

Answer 12

Receiver

Question 13

Devices that can both transmit (send) and receive data are sometimes referred to as ________

Answer 13

transceivers

Question 14

The transmission channel or medium (or media) is the ________ _____ by which a message travels from sender to receiver

Answer 14

physical path

Question 15

Common channels are:

Answer 15

1. Twisted-pair wires
2. Coaxial cables
3. Fiber optics
4. Radio waves

Question 16

A set of rules that govern the data communications process

Answer 16

Protocol

Question 17

It represents an agreement between the communicating devices – without it, two devices may be connected, but not “communicating”

Answer 17

Protocol

Question 18

The sender, receiver, and the channel are ________ components

Answer 18

hardware

Question 19

The three basic hardware components for a data communications network

Answer 19

1. A server
2. A client
3. A circuit

Question 20

The ________ stores data or software that can be accessed by the clients

Answer 20

server

Question 21

In ________ ________ , several servers may work together over the network with a client computer to support the business application

Answer 21

client-server computing

Question 22

A server can be a:

Answer 22

1. Personal computer (high-specced)
2. Mainframe

Question 23

The ________ is the input-output hardware device at the user’s end of a communication circuit

Answer 23

client

Question 24

It typically provides users with access to the network and the data and software on the server

Answer 24

Client

Question 25

A client can be a:

Answer 25

1. Personal computer (typically specced) 2. Terminal

Question 26

The ________ is the pathway through which the message travel

Answer 26

circuit

Question 27

It is typically ________ wire, although ________ cable and ________ transmission are becoming common

Answer 27

copper...fiber-optic...wireless

Question 28

The devices in the circuit:

Answer 28

1. Router 2. Switches 3. Modem

Question 29

Networks are called ________ networks because the computers functions as equals --- rather than relying on a central server for services, data, and software

Answer 29

peer-to-peer

Question 30

Common server types:

Answer 30

1. File server 2. Web server 3. Mail server

Question 31

Stores data and software that can be used by computers on the network

Answer 31

File server

Question 32

Stores documents and graphics that can be accessed from any Web browser

Answer 32

Web server

Question 33

Handles and delivers emails over the network

Answer 33

Mail server

Question 34

Three types of network according to scope:

Answer 34

1. Local area network (LAN) 2. Backbone networks (BN) 3. Wide area network (WAN)

Question 35

A group of computers located in the same general area --- such as floor or work area, a single building, or a group of buildings

Answer 35

Local area network

Question 36

A larger, central network connecting several LANs, other BNs, MANs, and WANs. Typically span hundreds of feet to several miles

Answer 36

Backbone network

Question 37

Connect BNs and MANs

Answer 37

Wide area networks

Question 38

A LAN that uses the same technologies as the Internet but is open only to those inside the organization

Answer 38

Intranet

Question 39

It is provided to invited users outside the organization who access it over the Internet

Answer 39

extranet

Question 40

Users are given __________ (username, password) to gain access to the extranet

Answer 40

credentials