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Chapter 6

BUS 237 Chapter Notes - Chapter 6: Local Area Network, Wireless Lan, Twisted Pair


Department
Business Administration
Course Code
BUS 237
Professor
All
Chapter
6

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Chapter 6 Networks and Collaborations
Why should I care about networks?
Networks and collaboration:
Collaboration occurs when two or more people work together to achieve a common goal,
result, or product
o When effective results of group are greater than those that could be produced by any of
the individuals working alone
o Involves coordination and communication and often makes use of computer networks
o Effectiveness is driven by 4 critical factors:
1. Communication skills and culture
Constructive criticism
2. Communication systems
more effective communication systems are crucial
Depend on an organizations network technology
3. Content management (focus of chapter 5)
Manage content so conflicts don’t occur
4. Workflow control
Workflow a process or procedure by which content is created, edited,
used, and discarded
o Concept is close to a business process (difference is that a
business process focuses on delivering a good or service
externally to a customer, whereas workflow focuses on the
internal delivery of a good or service to other employees in
organization
Network externalities:
Network externality - In general, the larger the number of people using a network, the more
valuable that network becomes
When networks first started, people often look for the critical mass
o The point at which the value of being part of the network is larger than the cost of being
on it
o Once networks hit critical mass, they grow at faster rate
Limits
o Congestion
o Market saturated or change
What is a computer network?
Computer network a collection of computers that transmit and/or receive electronic signals
through transmission media
Transmission media might be physical media (copper and optical fibre [glass fibre] cable), or
wireless media transmitting light or radio frequencies
3 major types of networks

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o Local area network (LAN) connects devices within a relatively small, single
geographical location. Number of connections range from 2-several hundred
Can place communication lines wherever it wants b/c all lines reside on
its premises
o Wide area networks (WANs) connect devices at different geographical locations
must contract with a communications vendor that is licensed by
government and already has capacity or authority to install more
connections between two locations
o internet network of networks
connect LANs, WANs, and other internets
The Internet the most famous collection of networks that you use
when you send email or access a website
Intranets private networks of networks
Use large variety of communication methods and conventions, and data
must flow seamlessly across them
Layered protocol used to provide seamless flow
Protocol a set of rules that communicating devices follow
For devices to communicate they must use the same protocol
What are the components of a LAN?
LAN is a group of computers connected together on a single site
Usually computers located within kilometre or so of each other (longer distances possible)
Switch a special-purpose computer that receives and transmits messages on the LAN
Network interface card (NIC) hardware components on each LAN that connects the devices
circuitry to the network cable
o Works with programs in each device to implements NIC, which is a NIC that is built into
the computer
Each NIC has a unique identifier which is called the MAC (media access control) address
Most connections made using unshielded twisted pair (UTP) cable
o UTP might be replaced by optical fibre cables if connections between switches carry a
lot of traffic or are far apart
Advantages: increased capacity, resistant to signal interference, have
greater transmission distance, and are more secure because signals are
optical pulses rather than electrical signals
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The IEEE 802.3, or Ethernet, Protocol:
Institute for electrical and electronics engineers (IEEE) sponsors committees that create and
publish protocols and other standards
IEEE 802.3 protocol is worlds most popular protocol for LAN
o This standard, also called Ethernet, specifies how messages are to be packaged and
processed for transmission over the LAN
Most computers today equipped with an onboard NIC that supports 10/100/1000 Ethernet
Wireless LANs:
Wireless LAN is a computer network that allows users to connect to a network without using a
network cable
o E.g. laptop, tablet, or smartphone equipped with a wireless NIC (WNIC) lets user stay
connected to their network without needing to plug in with a cable
Wireless LANs require one or more access points (APs) that wireless devices connect to
o AP connects users to the wired network
o Coverage of a wireless access point can range from 40-100 metres
o Devices called repeaters and reflectors sometimes used to amplify and reflect signals to
extend range
Why is a mobile computing important?
Smartphones are enabling new applications labelled m-commerce to allow users to conduct
new kinds of transactions
How do these changes affect you?
o Workers able to take their computing power with them when they leave the office
o Enable you to access your organizations network and all the data and services available
on WANs, such as the internet
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