978-0073402987 Appendix B Appendix B

Type

Solution Manual

Book Title

Business Driven Information Systems 5th Edition

ISBN 13

978-0073402987

April 4, 2019

NETWORKS AND

TELECOMMUNICATIONS

Networks and telecommunications are the transmission of signals over a distance

for the purpose of communication. In modern times, this process almost always

involves the sending of electromagnetic waves by electronic transmitters but in

earlier years it may have involved the use of smoke signals, drums or semaphore.

Today, network and telecommunication is widespread and devices that assist the

process such as the television, radio and telephone are common in many parts of

the world. There is also a vast array of networks that connect these devices,

including computer networks, public telephone networks, radio networks and

television networks. Computer communication across the Internet, such as email

and instant messaging, is just one of many examples of telecommunication.

NETWORKS AND TELECOMMUNICATIONS

Network Basics

Architecture

Topology

Protocols

Media

Ebusiness Networks

LEARNING OUTCOMES

1. Compare LANs, WANs, and MANs.

A local area network (LAN) is designed to connect a group of computers in

close proximity to each other such as in an o(ce building, a school, or a

home.

A wide area network (WAN) spans a large geographic area, such as a state,

province, or country. WANs often connect multiple smaller networks, such

as local area networks (LANs) or metropolitan area networks (MANs).

A metropolitan area network (MAN) is a large computer network usually

spanning a city.

Networks are differentiated by the following:

Architecture—peer-to-peer, client/server

Topology—bus, star, ring, hybrid, wireless

Protocols—Ethernet, Transmission Control Protocol

Media—coaxial, twisted-pair, /ber-optic

2. Compare the two types of network architectures.

Networks and Telecommunications - Instructor’s Manual Page 1 of 6

APPENDIX

A peer-to-peer (P2P) network is any network without a central /le server and

in which all computers in the network have access to the public /les located

on all other workstations. A client is a computer that is designed to request

information from a server. A server is a computer that is dedicated to

providing information in response to external requests. A client/server network

is a model for applications in which the bulk of the back-end processing, such

as performing a physical search of a database, takes place on a server, while

the front-end processing, which involves communicating with the users, is

handled by the clients

3. Explain topology and the different types found in networks.

Network topology refers to the geometric arrangement of the actual physical

organization of the computers and other network devices) in a network. The

/ve common types found in networks include:

Bus - All devices are connected to a central cable, called the bus or

backbone. Bus networks are relatively inexpensive and easy to install for

small networks.

Star - All devices are connected to a central device, called a hub. Star

networks are relatively easy to install and manage, but bottlenecks can

occur because all data must pass through the hub.

Ring - All devices are connected to one another in the shape of a closed

loop, so that each device is connected directly to two other devices, one on

either side of it. Ring topologies are relatively expensive and difficult to

install, but they offer high bandwidth and can span large distances.

Hybrid - Groups of star-con/gured workstations are connected to a linear

bus backbone cable, combining the characteristics of the bus and star

topologies.

Wireless - Devices are connected by a receiver/transmitter to a special

network interface card that transmits signals between a computer and a

server, all within an acceptable transmission range.

4. Describe protocols and the importance of TCP/IP.

Transmission Control Protocol/Internet Protocol (TCP/IP) provides the technical

foundation for the public Internet as well as for large numbers of private

networks.

5. Identify the different media types found in networks.

Wire media are transmission material manufactured so that signals will be

con/ned to a narrow path and will behave predictably. The three most

commonly used types of guided media are

Twisted-pair wiring

Coaxial cable

Fiber-optic cable

Wireless media are natural parts of the Earth’s environment that can be used

as physical paths to carry electrical signals.

Networks and Telecommunications - Instructor’s Manual Page 2 of 6

CLASSROOM OPENER

HowStu-Works

www.howstu*works.com provides a wealth of knowledge ranging from computer

basics to network infrastructures. There are several demos and diagrams. Show

your students the site and demo the Internet Infrastructure.

CLASSROOM EXERCISE

Cell Phones and Airplanes

Break your students into groups and ask them to research the Internet to /nd the

reasons why people are required to turn o* their cell phones when they are on an

airplane. There are two reasons why cell phones are not allowed on an airplane:

1. The Federal Communication Commission (FCC) bans the use of cell phones on

airplanes because they could wreak havoc with cell phone systems on the

ground. Signals from your cell phone, when you use it on or near the ground,

reach just a few cell phone nodes near you and the node that is getting the

strongest signal picks up your call. If you move, while driving your car or

walking, the next node picks up the call. From the air, however, your phone's

signal could reach miles, hitting many nodes at once, all with equal strength.

Plus, you are moving at several hundred miles an hour. Cell phone systems were

not designed to handle that.

2. The Federal Aviation Administration, for its part, supports the FCC ban for its

own reasons. They fear cell phones may interfere with navigation and other

aircraft systems.

Incident reports submitted by airline crews also demonstrate the potential for

trouble. NASA's Aviation Safety Reporting System's "Passenger Electronic Devises

Database Report Set" -- which could be subtitled "passengers behaving badly" --

contains several reports of incidents involving passengers whose "personal

electronic devices" seemed to create disturbances in aircrafts' electronic systems.

Nokia is a well known cell phone manufacturer, it is suggested that you go into

some depth on how Nokia got started. Here is the timeline:

1865 - Fredrik Idestam establishes a wood pulp mill on the banks of the

Tammerkoski Rapids. The event is generally considered the starting point for

Nokia's history. The small wood pulp mill quickly grew into a well-established

paper industry.

1871 - Idestam renames his company Nokia Ab. The product range was initially

extended from wood pulp to paper and sulphite cellulose, to be followed by

electricity generation in 1902.

1898 - Eduard Polón establishes the Finnish Rubber Works. During its early

years, the factory produced shoes, boots and overshoes, as well as industrial

hoses and belts.

1912 - Arvid Wickström establishes Suomen Punomotehdas Oy. The company

was the first Finnish company to manufacture electrical wires and cables.

1933 - Nokia's first car tire, with a summer tread, is launched.

Networks and Telecommunications - Instructor’s Manual Page 3 of 6

1987 - The first NMT (Nordic Mobile Telephony, Finnish telecommunications

authorities) portable phone, Mobira Cityman is launched. Prior to this, mobile

phones were in practice installed permanently in cars. Nokia becomes the

third-largest manufacturer or TV sets in Europe. After the acquisition of Oceanic

SA and Standard Elektrik Lorenz (SEL), TVs were Nokia's main business for a

while.

1992 - Nokia announces its first GSM (Global System for Mobile

Communications) mobile, model 1011. The phone's user interface and its design

form the basis of future models.

1993 - Nokia adopts the motto "Connecting People". The motto illustrates

Nokia's contribution to creating wireless connections between people.

1994 - Nokia announces the 2100 mobile phone series. In 1994, the goal was to

sell 500,000 units. Nokia sold 20 million.

1998 - Nokia becomes the world leader in mobile phones. One of the

cornerstones of Nokia's success in this field was the company's early

investments in digital GSM technology.

1999 - Nokia announces the 7110 model. The phone is the first Nokia mobile to

use WAP (Wireless Application Protocol). The WAP browser of Nokia 7110

provides the user with immediate access to the content of Internet pages using

a mobile phone.

2000 - Nokia 9210 Communicator marks the start of the color screen era for

Nokia mobile phones. The versatile device is designed for the business user,

and it is compatible with most o(ce software suites.

2002 - Nokia announces its first phone with a built-in camera. Nokia 7650 is

also the first Nokia phone to use the Series 60 software platform.

CORE MATERIAL

The core chapter material is covered in detail in the PowerPoint slides. Each slide

contains detailed teaching notes including exercises, class activities, questions,

and examples. Please review the PowerPoint slides for detailed notes on how to

teach and enhance the core chapter material.

APPLY YOUR KNOWLEDGE

Instructor Note: There are few right or wrong answers in the business world.

There are really only efficient and inefficient, and effective and ineffective business

decisions. If there were always right answers businesses would never fail. These

questions were created to challenge your students to apply the materials they

have learned to real business situations. For this reason, the authors cannot

provide you with one version of a correct answer. When grading your students’

answers, be sure to focus on their justification or support for their specific answers.

A good way to grade these questions is to compare your student’s answers against

each other.

1. NETWORK ANALYSIS

Networks and Telecommunications - Instructor’s Manual Page 4 of 6

Project Purpose: To implement a wireless network.

Potential Solution: There are a number of advantages to implementing a

wireless network such as using a PDA to /nd information while walking around

the club. Customers could connect to the wireless network with their own

laptops to check email and perform work while at the club. Wireless iPods are on

the market and customers could download songs and podcasts while working

out. The numbers of advantages of a wireless network are endless. However,

the club should also be aware of the security issues associated with a wireless

network.

2. SECURE ACCESS

Project Purpose: To begin to understand how vulnerable all computer

networks are and the security features needed to protect them.

Potential Solution: There are a variety of answers here. Students should

separate their responses according to software and hardware:

Software

oVirus protection software is crucial to network security. These software

programs scan all data entering a network from any outside source for

known viruses and warn of any viruses encountered to avoid corrupting

network software. Updates for virus software are made available through

the vendor, usually on a subscription basis.

Hardware

oProtection against unauthorized access from outside a network is usually

provided through some sort of /rewall service. Firewalls are either

computers or routers that are set up to provide a secured “doorway”

through which users can access the Internet and Internet users can

access Web data. Firewall services can be con/gured to meet specific

security needs. They can be set up to screen Internet users trying to

access a network, and to allow only certain authorized employees to

access the Internet from within a network.

oIn addition, many /rewalls now feature remote authorization for

employees using a remote (o*-site) Internet connection to access

restricted network resources. Other non-Internet applications for /rewall

services include protecting mainframes or subnetworks from general

access within an organization and ensuring con/dentiality of data

transmitted across networks.

3. TELECOMMUNICATION OPTIONS

Project Purpose: To research current telecommunication technologies and

their attributes.

Potential Solution: Here is another exercise that students should /nd

interesting and “hot.” This may take some outside research, but encourage

students to think on their own to answer this. Some responses might include:

Improving communication between employees and customers

Video conferencing/ Web conferencing

Short-notice meetings

Problem-solving brainstorm sessions

Networks and Telecommunications - Instructor’s Manual Page 5 of 6

4. FRYING YOUR BRAINS

Project Purpose: The disadvantages to wireless networks

Potential Solution: Researching the issues related to using

telecommunication equipment can be enlightening as more and more people

use technology from a younger age we are seeing many issues, such as

ergonomics. Encourage your students to create a product that reaches this

growing market as more and more people suffer from computer related illnesses

such as carpel tunnel syndrome.

5. HOME NETWORK EXPERIENCE

Project Purpose: To understand how easy it is to implement a home network

Potential Solution: Many of your students already have experience

implementing a home network. A simple Google research on setting up a home

network will provide your students with videos and detailed information on how

easy this task is to accomplish. For a twist on this activity also ask your

students to research how to “hack” a home network.

6. THE INTERNET IS ALMOST FULL

Project Purpose: To understand IPv4

Potential Solution: Here is another exercise that students should /nd

interesting and “hot.”

Networks and Telecommunications - Instructor’s Manual Page 6 of 6

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