How many of your laptops use wireless connectivity? What are the advantages of wireless connectivity? When you purchase a device does its wireless capabilities play a part in your purchasing decisions? MP3 players are beginning to offer wireless capabilities, will you buy a new MP3 player just to receive the wireless connectivity?
What is the relationship between strategic initiatives such as supply chain management and customer relationship management and e-business networks? The technology component of these initiatives depends on the e-business network to make the initiative successful For example, without an e-business network having a SCM system that can view all areas of the supply chain would be impossible
MANS : networks that extend beyond the boundaries of a building.
It is a network that is larger than a LAN and connects clients and servers from multiple buildings
WANS: a network that connects two or more geographically distinct LANS or MANS.
Different than MANs because they typically transport data over much longer distances than MANs and as such often require different transmission methods, media, and use a greater variety of technologies
LANs, MANs, and WANs Illustrated Within the confines of a room or single building Connecting LANs from multiple buildings Commonly connects separate offices from the same organization, whether they are across town or across the world
Typically less expensive to setup and maintain than other types of networks.
Not very flexible : as P2P networks grow, adding or changing significant elements of the network can be difficult
Not very secure : data and other resources shared by network users can be easily discovered and used by unauthorized users
Resource Sharing is not practical : each user is responsible for configuring Shared Docs and preventing access to other files: Meaning resource sharing is not controlled by a central computer or authority
Client/Server networks: use a central computer, known as a Server to facilitate communication and resource sharing between other computers on a network, which are known as Clients .
In terms of resource sharing you can compare the client/server network to a public library: Librarians manages the use of books and other media by patrons, a server manages the use of shared resources by clients…
Network topology - refers to the geometric arrangement of the actual physical organization of the computers and other network devices) in a network
Bus/Star/Ring Topologies Bus Topology (linear bus) All devices are connected to a central cable, called the bus or backbone. These networks are relatively inexpensive and easy to install for small networks Star Topology All devices are connected to a central device, called a hub. Star networks are relatively easy to install & manage, but bottlenecks can occur because all data must pass through the hub Ring Topology The ring topology connects computers on a single circle of cable. Signals travel around the loop in one direction and pass through each computer acting like a repeater to boost the signal and send it on to the next computer.
Hybrid / Wireless Topologies Hybrid Topology Groups of star-configured workstations are connected to a linear bus backbone cable, combining the characteristics of 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 with an acceptable transmission range
This system of allowing each machine to decide which packets to process does not provide any security.
Keep in mind that any device that can connect to the network cable can conceivably capture any data packet transmitted across the wire. Many network diagnostic programs, commonly referred to as packet sniffers , can tell a NIC to run in promiscuous mode .
Wireless media - natural parts of the Earth’s environment that can be used as physical paths to carry electrical signals
Atmosphere and outerspace are examples of wireless media that commonly carry signals
Networking Hardware Basics Hubs Connectivity device that retransmits incoming data signals to its multiple ports –Typically used for Star topologies and use twisted pair cabling Repeaters A device used to regenerate a signal—addresses a transmission signal problem called attenuation Bridges Allows large networks to be broken up into segments-segments are connected by a bridge----manages bandwidth Switch Also manages bandwidth on a large network—further divides a network into smaller domains Router Routing device that examines each packet of data it receives and then decides which way to sent it towards its destination
The medical industry is attempting to increase efficiency and functionality by adopting technology. This technology takes the form of electronic medical records, radio frequency identification for patient tracking, and wireless networking among other technologies.
These technologies increase the productivity of institutions but, also introduce new risks to patient privacy.
RFID: radio frequency identification combined with wireless networking technology.
RFID tags used could be used in conjunction with patient’s cell phones to provide a wide variety of dietary and health related information when buying groceries
The literature states that wireless network technology and RFID’s could provide medical providers with “location tracking, body sensors, and short range wireless communications for monitoring the health of patients.