3.1.1 Basic concepts of Networks and Communications

3.1.5 Networks Topologies

3.1.5.1 State three types of network topologies : Bus, Ring and Star

3.1.5.2 Differentiate between the three types of network topology

BUS TOPOLOGY

DESCRIPTION Found in LAN sometimes have more than one server and sometimes do not need server.

DEPENDENCE If one nodes fail, it’s not effect network

ADVANTAGES Easy implementation Failure of nodes does not effect the entire LAN No disruption to the network when connecting or

removing device

DISADVANTAGE

If the backbone (wired) fails, entire network will extended.

Network speed decrease when number of PC increase difficult troubleshooting when one nodes fails

RING TOPOLOGY

DESCRIPTION Found in LAN, server may exist but not connect to all nodes in the network

DEPENDENCE If one node fail, the network will fail to function

ADVANTAGES Troubleshooting is easy when one of the nodes fails Repair or removing nodes, the network still

functioning

DISADVANTAGE

Difficult implementation failure of one nodes will failure the entire network

Connecting and removing device difficult Network speed decrease when number of PC

increase

STAR TOPOLOGY

DESCRIPTION Found in LAN. Must have a host that can be server, hub or router

DEPENDENCE If one fail, network can still function as long the host still working, if the host not working network will fail to function

ADVANTAGES Easy implementation failure of nodes does not effect

the entire LAN No disruption to the network when connecting or

removing device Troubleshooting is easy when the host fails. Simply

repair or replace the host

DISADVANTAGE

Failure of host will effects the entire network Network speed decrease when number of PC

increase Host must be installed to control the network

3.1.1 Basic concepts of Networks and Communications

3.1.6 Protocols

3.1.6.1 Define Transmission Control Protocol/Internet Protocol (TCP/IP)

as a protocol to facilitate communication over computer network

DEFINITION

Is internet communication protocol

Standard that set rules for PC must follow in

communicating with each other on a network

Some refer to TCP/IP as internet protocol suite

TRANSMISSION CONTROL

PROTOCOL(TCP)

Protocol that set of communication rules between

computers

Establishes connection between 2 PC, protect agains

data loss and data corruption

Responsible for breaking the data into packets before the

are sent than assemble the packets when they reach a

destination

INTERNETPROTOCOL

(IP)

Protocol that transfer data form node to node (PC to PC)

IP take care of delivering data packets between 2 PC

Responsible for sending the packets from sender to

receiver

3.1.1 Basic concepts of Networks and Communications

3.1.7 Internet, Intranet and Extranet.

3.1.7.1 Describe the types of network communications technology

INTERNET

The internet, or the net is the worldwide, publicly accessible system of interconnected computer networks that transmit data by packet switching using the standard Internet Protocol (IP). It consist of millions of smaller business, academic, domestic and government networks, which together carry various information and services, such as electronic mail, online chat, and the interlinked web pages and other documents of the world wide web. Internet is one of the uses of communication, through the internet, society has access to global information and instant communication.

INTRANET

An intranet (intra means within) is an internal network that uses internet technologies and it is a small version of the internet that exists within an organization. An intranet is a private computer network that uses internet protocols, network connectivity and possibly the public telecommunication system to securely share part of an organizations information or operation with it’s employees. Intranet generally make company information accessible to employees and facilitate working in groups. Simple intranet applications include electronic publishing of organizational materials such as telephone directories, event calendars and job postings.

EXTRANET

Extranet is a private network that

uses internet protocols, network

connectivity, and possibly the

public telecommunication system

to securely share part of a

business information or operations

with suppliers, vendors, partners,

customers or other businesses.

Package shipping companies, for

example, allow customers to

access their network to print air

bills, schedule pickups, and even

track shipped packages as the

packages travel to their

destinations.

Network Topology

SCORE

Network Topology

SCORE

1. A bus refers to the main physical pathway or central cable where all other devices are connected to it.

A. TRUE

B. FALSE

2. If the backbone fails, the network can still function.

A. TRUE

B. FALSE

3. A bus topology consists of a double central cable to which all computers and other devices connect.

A. TRUE

B. FALSE

4. One of the advantages of the bus topology is new devices can be added to the backbone or to the existing nodes.

A. TRUE

B. FALSE

5. Bus networks are very common in Wide Area Networks (WAN).

A. TRUE

B. FALSE

6. In a bus topology, troubleshooting is difficult when one of the nodes fails.

A. TRUE

B. FALSE

7. A bus network must have a common backbone (the central cable) to connect all devices.

A. TRUE

B. FALSE

8. In communications technology, a bus network is like as a common “highway” in which data is transmitted.

A. TRUE

B. FALSE

9. Bus topology and bus network are two different things.

A. TRUE

B. FALSE

10. In a bus topology, failure of a node will affect the entire LAN.

A. TRUE

B. FALSE

Ring Topology SCORE

1. A ring topology consists of a single central cable to which all computers and other devices connect.

A. TRUE

B. FALSE

2. A server may exist in a ring network, but it will not connect to all the nodes in the network.

A. TRUE

B. FALSE

3. A ring network can be found in Wide Area Networks.

A. TRUE

B. FALSE

4. A ring network does not have a common backbone.

A. TRUE

B. FALSE

5. Ring topology is also known as ring network.

A. TRUE

B. FALSE

6. If one of the nodes in a ring network with backbone fails, the network will fail to function.

A. TRUE

B. FALSE

7. If one of the nodes in a ring network with backbone fails, the network can still function as long as the backbone is working.

A. TRUE

B. FALSE

8. In a ring network, a failing node does not affect the entire LAN.

A. TRUE

B. FALSE

9. If a ring network has a ring-form backbone, then all nodes will connect to the backbone.

A. TRUE

B. FALSE

10. In a ring network, troubleshooting is difficult when one of the nodes fail.

A. TRUE

B. FALSE

Star Topology

1. A star network is found in a ________________________setting.

2. In the early days of computer _______________,all computers were connected to a centralised mainframe computer.

3. A star topology is also known as___________________

4. The idea of a ________________computer is where the basic concept of a star topology comes from.

5. Network speed ____________________when the number of nodes increases.

6. If one of the nodes ________________ the star network can still function as long as the host is working.

7. __________________is difficult when one of the nodes fails.

8. A star topology consists of a _______________which acts as the centre and all nodes connect to the host.

9. In a star network, every ________________will not connect to the neighbouring nodes.

Differences of Network TopologySCORE

1. Each topology influences the capabilities of the hardware in order to manage the flow of information. True False

2. Ring topology has no limit to install as many numbers of nodes when extending a network. True False

3. Star topology has an average capacity in adding and removing nodes.True False

4. Star topology has it own host.True False

5. Ring topology does not have connection between each node.True False

6. Bus topology has a central host and all nodes connect to it.True False

7. In a ring topology, all computers and other devices are connected in a circle.True False

8. Star topology limits installation of many numbers of nodes when extending a network.

True False

9. Bus network has no difficulties in troubleshooting.True False

10. Bus topology can install many numbers of nodes when extending a network.True False

Introduction to TCP/IP SCORE

1. IP is the protocol that transfers data from node to _____________________.

2. TCP is responsible for breaking the data into_____________ before they are sent, and assemble them when they reach a destination.

3. IP is responsible for sending the packets from sender to __________________.

4. Some refer TCP/IP as the ________________________.

5. TCP stands for _______________________

6. IP takes care of delivering data packets between two ___________________

7. TCP/IP is the internet communication_________________________

8. IP stands for ____________________

9. TCP/IP is a _________________that sets the rules computers must follow in communicating with each other on a network.

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

_________________ corruption.

Types of Network Communication Technology

1. An ________ __ can be viewed as part of a company's Intranet that is extended to users outside the company.

Answer:

2. It has a Web server, supports multimedia Web pages coded in HTML and is accessible via a Web browser such as Microsoft Internet Explorer or Netscape Navigator.

Answer:

3. It consists of millions of smaller business, academic, domestic and government networks, which together carry various information and services, such as electronic mail, online chat. It also carries interlinked Web pages and other documents of the World Wide Web.

Answer:

4. Package shipping companies, for example, allows customers to access their network to print air bills, schedule pickups, and even track shipped packages as the packages travel to their destinations.

Answer:

5. Through the society has access to global information and instant communications

Answer:

6. Sometimes the term refers only to the most visible service, the internal website.

Answer:

7. It has a Web server, supports multimedia Web pages coded in HTML and is accessible via a Web browser such as Microsoft Internet Explorer or Netscape Navigator.

Answer:

1. In intranet, ______________and other Internet protocols are commonly used as well, especially FTP and email.

2. The same concepts and technologies of the Internet such as clients and servers running on the Internet protocol suite are used to build an __________________

3. Sometimes a company uses an ,________________which allows customers or suppliers to access part of its network.

4. Contrary to some common usage, the Internet and the ________________are not synonymous.

SCORE

5. Intranet has a Web server, supports multimedia Web pages coded in HTML and is accessible via a _________________ such as Microsoft Internet Explorer or Netscape Navigator.

Internet

1. Internet is a global network connecting millions of computers.A. TRUEB. FALSE

2. There is only one category of Internet connection and this is called broadband.A. TRUEB. FALSE

3. Some of the many usages of the Internet are entertainment, commerce and education.

A. TRUEB. FALSE

4. Internet transmits data by using Internet Protocol (IP).A. TRUEB. FALSE

5. Internet connection is divided into two categories; dial-up and Streamyx.A. TRUEB. FALSE

SCORE

6. An ISP can either be a telecommunication company or any other organization specialising in providing access to Internet services.A. TRUEB. FALSE

7. The Internet is the world’s largest computer network connecting millions of computersworldwide.A. TRUEB. FALSE

8. Internet service can only be provided by a telephone company.A. TRUEB. FALSE

9. Currently, Malaysia has four telephony companies providing Internet services.A. TRUEB. FALSE

Intranet

1. Intranet is an internal network within the organisation.

True False

2. Intranet can be accessed by other computers outside an organisation with the use of login names and passwords.

True False

3. Intranet has its own firewall to protect from intruders outside an organisation from accessing the company information or data. True False

4. Intranet can be accessed without the use of user ID or login name and password..

True False

5. Intranet can connect two branches of an organisation even though they are located at two different places.

True False

6. The Internet connects networks worldwide, while intranet works within a particular organisation.

SCORE

True False

7. Intranets include services like email, company information, employee handbook, company events and calendars as well as job postings.

True False

8. Intranets do not support groupware applications.

True False

9. If Ali is in Jakarta on a business trip, he can still access company information by

going through his company’s website, entering his user ID or login name and password.

True False

10. With intranet, meetings and discussions can be carried out without having to physically meet at a meeting room. True False

Extranet

1. Only __________ or authorised users can navigate or access an extranet.

2. Through extranet, users can share product __________ exclusively with wholesalers or those "in the trade”.

3. News of __________ interest can be shared privately with partner companies using extranet.

4. __________ with other companies on joint development efforts can be done via extranet.

SCORE

5. __________ can access the Internet while extranet is only limited to defined sets of customers, suppliers or partners.

6. Extranet is within a firewall while the __________ might be with or without a firewall.