Chapter 1

Question 1

What is Telecommunication?

Answer 1

Communication at a distance.

Question 2

What is Data?

Answer 2

Information presented in whatever form agreed upon by the parties creating and using the data.

Question 3

The exchange of data between two devices via some form of transmission medium is called………

Answer 3

Data Communications

Question 4

What are the four characteristics of Data Communications?

Answer 4

• Delivery
• Accuracy
• Timeliness
• Jitter

Question 5

What is Jitter?

Answer 5

The uneven delay in the delivery of packets.

Question 6

What are the 5 components of Data Communications?

Answer 6

• Message
• Sender
• Reciever
• Transmission Medium
• Protocol

Question 7

A set of rules that govern data communications is called………..

Answer 7

Protocols

Question 8

What is a Transmission Medium?

Answer 8

The physical path a message travels from sender to reciever.

Question 9

How is text represented?

Answer 9

Bit pattern using Unicode.

Question 10

How are numbers represented?

Answer 10

Binary

Question 11

How are images represented?

Answer 11

Bit patterns using RBG/YCM

Question 12

How is audio represented?

Answer 12

Analog or digital signals.

Question 13

How are videos represented?

Answer 13

A continuous series or combination of images.

Question 14

Data that is sent/received one way only is considered ………..

Answer 14

Simplex

Question 15

When devices take turns sending or receiving data, it is called ………..

Answer 15

Half Duplex

Question 16

When devices send and receive data at the same time, it is called …………

Answer 16

Full Duplex

Question 17

What is a Network?

Answer 17

The interconnection or set of devices capable of communication.

Question 18

What criteria must a network meet?

Answer 18

• Performance
• Reliability
• Security

Question 19

What is Transit Time?

Answer 19

The amount of time required for a message to travel from one device to another.

Question 20

What is Response Time.

Answer 20

The elapsed time between an inquiry and a response.

Question 21

What is a link?

Answer 21

A communications pathway that transfers data from one device to
another

Question 22

What is the topology of a network?

Answer 22

The
geometric representation of the relationship of all the links and linking devices (usually called nodes) to one another.

Question 23

Name the different topologies.

Answer 23

• Mesh
• Bus
• Star
• Ring
• Tree
• Hybrid

Question 24

Describe Local Area Network (LAN)?

Answer 24

Usually privately owned and connects some hosts in a single office, building, or campus.

Question 25

Describe Wide Area Network (WAN)?

Answer 25

A connection of devices with a wider geographical span, spanning a town, a state, a country, or even the world.

Question 26

How does point-to-point WAN work?

Answer 26

It is a network that connects two communicating devices through a transmission media

Question 27

What is a switched WAN.

Answer 27

A network with more than two ends.

Question 28

What is an Internetwork?

Answer 28

Two or more networks connected together.

Question 29

What is an internet?

Answer 29

Two or more networks that can communicate with each other.

Question 30

What is the Internet

Answer 30

millions of interconnected networks.

Question 31

What are the two principles of Protocol Layering?

Answer 31

1. Make each layer to perform two opposite tasks in each direction. 2. Two objects under each layer should be identical.

Question 32

What are the layers of the Transmission Control Protocol/Internet Protocol (TCP/IP)?

Answer 32

Application Transport Network Data Link Physical

Question 33

Describe the responsibility of the Physical Layer.

Answer 33

Carries individual bits in a frame across the link.

Question 34

Describe the responsibility of the Data Link layer.

Answer 34

Takes the datagram and moving it across the link.

Question 35

Describe the responsibility Network layer.

Answer 35

Creates connection between the source computer and the destination computer.

Question 36

Describe the responsibility of the Transport layer.

Answer 36

Gets the message from the application layer, encapsulates it in a transport-layer packet.

Question 37

Describe the responsibility of the Application Layer.

Answer 37

Exchanges messages between two application layers as though there were a bridge between them.

Question 38

What is the International Organization for Standardization (ISO)?

Answer 38

A multinational body dedicated to worldwide agreement on international standards.

Question 39

What are the layers of the Open Systems Interconnection (OSI) model?

Answer 39

Application Presentation Session Transport Network Data Link Physical

Question 40

What are the units of data for each layer in the TCP/IP?

Answer 40

1. Application: Message 2. Transport: Segment or User Datagram 3. Network: Datagram 4. Data Link: Frame 5. Physical: Bits

Question 41

What are the Addresses for each layer in the TCP/IP?

Answer 41

1. Application: Protocol dependent 2. Transport: Port addresses 3. Network: IP address (Logical address) 4. Data Link: Physical address (Mac address) 5. Physical: none

Question 42

What are the sizes of each layer in the TCP/IP?

Answer 42

1. Application: depends on addresses 2. Transport: 16 bits 3. Network: IPV4 - 32/IPV6 - 128 bits 4. Data Link: 48 bits 5. Physical: bits