Chapter 3 Computer Network And Communication

Front 1

Definition of computer networks and Communication.

Back 1

1. Computer network is a system of interconnected computers and peripheral devices.

2. Peripheral devices: printers, scanners and cameras.

3. Function: exchange & share information and resources a network.

4. Medium: wire or wireless.

5. Hardware & software used to able interconnected in a network.

Front 2

Definition of communication

Back 2

Is about the transfer of information from a sender, across a distance, to a receiver.

Front 3

The important of computer networks and Communication

Back 3

1. E-business

2. Online Education

3. E-Banking

4. Long Distance Communication.

Front 4

E-Business

Back 4

~ business transaction

~ buying & selling

~ servicing customer

~ collaborating with business partners

Hint 4

Activities

Front 5

Online education

Back 5

~ student at any location around the world can participate in an online classroom.

~download tutorial questions and submit the assignment

Hint 5

Activities

Front 6

E-banking

Back 6

~ account management, fund transfer, payment over internet.

~ transaction can be done anywhere and anytime. (Save time because no traversing & queuing at counter)

Front 7

Long distance communication

Back 7

~Communication is possible via voice, text on video.

~Is cheaper than making normal phone call.

~ is faster and more effective than letters of fax.

Front 8

Types of computer networks

Back 8

1. Local Area Network (LAN)

2. Metropolitan Area Network (MAN)

3. Wide Area Network (WAN)

Front 9

Local area network

Back 9

1. Covers a small region of space , typically a single building.

2 Example: school lab

Front 10

Metropolitan area network

Back 10

~A collection of LANs with the same geographical area, for instance a City.

~ Example: Kuala Lumpur

Front 11

Wide area network

Back 11

A collection of LANs and or MANs or the mix of two with a very large geographical area, for instance a country or beyond the border.

Example: between KL and London.

Front 12

Defferentiate between the three types of computer network

Back 12

Front 13

Types of network architecture

Back 13

1. Client/ server

2. Peer-to-peer

Hint 13

2 types

Front 14

Differentiate of client/ server and peer-to-peer network

Back 14

Front 15

Types of network topology

Back 15

Bus topology

Ring topology

Star topology

Hint 15

3 types of network topology,

Front 16

Bus topology

Back 16

~ consists of a single central cable (backbone) which all nodes (computer and peripheral devices) connected.

~ If one of the nodes fails, the bus network would still function as long as the backbone is working.

Front 17

Ring topology

Back 17

~ all nodes connected in a loop.

~ each node directly connected to 2 neighborhood nodes.

~ one of the nodes fails, the entire network would down.

Front 18

Star topology

Back 18

~ consists of a center host and all nodes connected to the host.

~ host: hub, switch, modem router, server.

~ the host will control the flow of communication in the network.

~ if one of the nodes fails, the network can still function as long as the host is working.

Front 19

Differentiate between three types of network topology

Back 19

Front 20

Network Protocol

Back 20

1. Transmission Control Protocol/ Internet Protocol (TCP/IP)

2. Hypertext Transfer Protocol (http)

3. Files Transfer Protocol (FTP)

4. Simple Mail Transfer Protocol (SMTP)

Front 21

Transmission Control Protocol/ Internet Protocol (TCP/IP)

Back 21

~ is a internet communication protocol

~ is a standard that sets the rules for communication on network.

~TCP establishes connection between two computers, protects against data loss and data corruption.

~ IP takes care of delivering data packets between two computers

Front 22

Hypertext Transfer Protocol (http)

Back 22

Display web page written using HTML languange (tag)

Front 23

Files Transfer Protocol (FTP)

Back 23

Transfer files directly to the server.

Front 24

Simple Mail Transfer Protocol (SMTP)

Back 24

– This protocol is used for transferring e-mail between computers.

Front 25

Network Communication Technology

Back 25

1. Intranet

2. Extranet

3. Internet

Hint 25

3 types

Front 26

What is Intranet?

Back 26

~ is an internal network that uses internet that exists within an organisation.

~ is a private network.

~ share an organisation's information or operation with its employee only.

~ Example: telephone directory, events calendars & job postings.

Front 27

What is Extranet?

Back 27

~ a private network.

~ share parts of the business's information or operations with partners, suppliers, vendors, customers or others business.

~ given ID and Password to access company server.

Front 28

What is internet?

Back 28

~ is a public network

~ interconnected millions of conputer network that transmit data by packet switching using internet protocol (IP).

~ carry internet services like: electronic mail, online chat, World Wide Web (WWW).

Front 29

Devices needed in computer network communication

Back 29

1. A network card or PC card

a) NIC ~ Network Interface Card.

b) WNIC~ wireless NIC

2. MODEM (internal & external)

3. Hub, switch, router

4. Wireless Access Point (WAP).

Front 30

Network card

Back 30

A network card or PC card that enable computer to access the network.

a) NIC ~ Network Interface Card. (Conner to cable)

b) WNIC~ wireless NIC

Front 31

MODEM (internal & external)

Back 31

~ enables computer to transmit data over telephone or cable.

~Convert analog signal to digital signal, vice versa.

Front 32

Hub, switch, router

Back 32

1. To connect segment of a LAN. (Hub & switch)

2. To connect multiple computer or network( router)

Front 33

Wireless Access Point (WAP).

Back 33

~ a device that allow computers to transfer data wireless.

(mobile device)

Front 34

Types of network communications channels (Medium)

Back 34

1. twisted-pair cable

2. coaxial cable

3. fiber-optic cable

4. satelite systems

5. wireless systems

~radiowaves, microwaves and infrared.

Front 35

Twisted-Pair Cable

Back 35

1. 2 wires twisted together.

2. Wrapped with plastic outer jacket

3. Connector: RJ45

4. UTP~Unshielded Twisted-Pair Cable.

5. STP~Shielded Twisted -Pair Cable.

Front 36

Coaxial Cable

Back 36

1. Single copper cable surrounded by at least 3 layer.

2. Cable television

Front 37

Fiber-optic cable

Back 37

1. Using light for data transmission.

2. Consists of hundred of thin strand of glass or plastic.

Front 38

Comparison of 3 types of wireless transmission media

Back 38

Front 39

Network Operating System (NOS)

Back 39

~ NOS has additional functionality that allows it to connect computer and paripherals to a network.

~ most frequenly used with LAN & WAN.

~Example: Windows NT, Windows 2000 Server, Windows Server 2003, Red Hat Linux.

Front 40

Client Software

Back 40

1. Web Browser ( Internet Explorer, Safari, Netscape, Firefox, Opera)

2. Email Client

3. File Transfer Protocol (FTP) Client.