CHAPTER 6

Question 1

Basic components of a data communication system.

Answer 1

1. Sending- initiates instruction
2. Communication channel- media on which data information travel
3. Receiving - accepts transmission of data

Question 2

What is communication software

Answer 2

-programs that help users establish connection to Internet, manage transmission of data, and provide an interface for users to communicate.

Question 3

What is hub

Answer 3

device that provides central point for cables and in network

Question 4

What is router

Answer 4

Connects computers and transmits data to correct destination on a network

Question 5

Types of communication channel

Answer 5

communication channel- transmission media which are capable of carrying more signals
Physical transmission media- wire, cable, and other materials used to send communication signals
1. Twisted pair cable- used for telephone systems and network cabling
2. Coaxial cable- often used for cable television wiring
3. Fiber-optic cable- capable of carrying significantly more data at faster speeds than wire cables
4. wireless transmission data- used when inconvenient, impractical, or impossible to install cables
5. Broadcast radio- distributes radio signals over long and short distances
6. Cellular radio- form of broadcast radio used for mobile communications
7. Communication satellite- space station that receives signals from earth-based stations
8. Microwave- earth-based reflective dish used for microwave communications

Question 6

Networks

Answer 6

1. networks are collection of computers and devices connected via communication devices and transmission media such as LAN, WAN, MAN

Question 7

Types of networks

Answer 7

LAN (local area network)- network limited in geographical area such as home or office building- LAN and WLAN (wireless)
MAN metropolitan area network- connects LANs in city or town
WAN wide area network- network that covers large geographic area

Question 8

Intranet,extranet,internet

Answer 8

Internet- global network of computers
Extranet- allows customers or suppliers to access part of company’s intranet
Intranet- Internal network that uses internet technologies makes information accessible to employees.

Question 9

Types of network structures

Answer 9

1. client/server network- one or more computers act as server/ simple network that connects fewer than 10 computers
2. Internet peer-to-peer- enables users to connect to each other’s hard disks and exchange files directly.
3. BUS network- all computers and devices connect to central cable, or bus.
4. RING network- cable forms closed ring, or loop, with all computers arranged along ring
5. STAR network- all devices connect to a central device called hub and all data transferred from on computer to another pasees through hub.

Question 10

IOT (internet of things)

Answer 10

• pervasive web with the purpose of connecting or exchanging data with other devices over the internet
  USED BY: home. industrial, automotive, agriculture, military, medical, environmental, retail, etc