Chapter 20

Question 0

Bandwidth is the speed at which information can be transferred.

Answer 0

True

Question 1

A communication network exists when two or more devices are connected together by some type of media for the sole purpose of exchanging information

Answer 1

True

Question 2

Which is not a type of Network Category:

Answer 2

CAN

Question 3

The LAN system is the largest type of Network.

Answer 3

False

Question 4

The three network topologies are:

Answer 4

Ring, Bus, Star

Question 5

The two topologies that are not commonly used in industrial plants are:

Answer 5

Ring and Star

Question 6

Shielded twisted pair cable is most often used in offices and buildings.

Answer 6

False

Question 7

Which of the following is not a type of twisted pair cable?

Answer 7

BTP-45

Question 8

Coaxial cable is used widely in industrial control networks because:

Answer 8

It’s immunity to electrical noise generated by equipment.

Question 9

Coaxial cables have characteristic impedance’s, 50 ohms, 75 ohms, etc.

Answer 9

True

Question 10

The two typical devices to convert electrical signals into light are:

Answer 10

LED and laser

Question 11

Fiber optic is the best type of network media because:

Answer 11

It’s high data rates over long distances.
It’s immunity to electrical noise.
It carries no current so that it is not a fire hazard.

Question 12

EMI is:

Answer 12

Electromagnetic Interference or Electrical noise

Question 13

Running a cable in steel conduit does not provide excellent EMI protection.

Answer 13

False. Steel conduit is excellent protection.

Question 14

Any device connected to a network must have some means of identification so that it only receives the messages that are intended for it.

Answer 14

True

Question 15

Which of the following is an example of a typical residential IP network address?

Answer 15

255.255.0.0

Question 16

What is the most common access method used in industrial control networks?

Answer 16

Token Passing Access Method

Question 17

Which Access Method gives nodes equal rights to transmit, without waiting for permission?

Answer 17

CSMA/CD Access Method

Question 18

Network communication protocols are sets of formal rules on how to transmit and share data across a network. OSI is one of these protocols and stands for:

Answer 18

Open Systems Interconnect

Question 19

What layers are require for the OSI model to operate?

Answer 19

Physical, Data Link, and Application

Question 20

A message is a common term used to describe information transmitted via a network.

Answer 20

True

Question 21

If a message is too large for one data packet, the message is broken up into several data packets and each is given a sequence number.

Answer 21

True

Question 22

Proprietary networks, as opposed to open system network protocols, allow devices from many different manufactures to be used.

Answer 22

False

Question 23

Some of the most common device and process bus protocols used today are:

Answer 23

DeviceNet, Foundational Fieldbus, and Profibus-DP

Question 24

Information networks work at the middle level of the control system.

Answer 24

False. They work at the highest level.

Question 25

Control networks use which network access protocol?

Answer 25

Token Passing (peer-to-peer)

Question 26

Foundation Fieldbus, established in 1994, is a single international open bus standard for hazardous environments that enables devices of different manufacturers to be integrated into one system.

Answer 26

True

Question 27

Which bus has a faster communication speed?

Answer 27

HSE

Question 28

Profibus was developed by ______, Modbus by ______, and ContolNet by ______.

Answer 28

Siemens, Modicon, Allen-Bradley

Question 29

Modbus has a slower data transfer rate than DH+.

Answer 29

False

Question 30

The main difference between Data Terminal Equipment (DTE) and Data Communications Equipment (DCE) is that DTE produces and consumes data on network, while DCE receives and forwards data across the network.

Answer 30

True

Question 31

Who invented the Ethernet Network Connection?

Answer 31

Xerox Corporation

Question 32

Devices connected to an Ethernet network from different manufactures are not guaranteed to communicate with each other, even though they are on the same network called "Ethernet".

Answer 32

True

Question 33

A Network Interface Card (NIC) is a built-in Ethernet network interference port identified by three parts: it's transmission rate, transmission method, and cable type.

Answer 33

True