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23 Cards in this Set
- Front
- Back
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What are the key issues regarding network security?
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confidentiality, authenticiy, integrity, availability.
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computers (nodes) connect to another node (server) which takes them to another node (router) which then takes them to the internet the internet.
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how a computer connects
Computer, server, router, internet |
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Covers a small geographic location
Usually within a building or between closely located buildings |
LAN
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Covers a broader geographic location
May connect multiple LANs together |
WAN
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Covers a distance such as a city or large campus
May connect multiple LANs together |
MAN
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How do parts of a network (or internet) connect?
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Hub, switch, router
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Least intelligent, least expensive
Forwards every packet it receives to every other computer Easy way to connect computers in a small network |
Hub
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Like a hub but more intelligent
Reads the packet header and forwards it to the correct computer More efficient especially in networks with lots of traffic |
switch
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Manages traffic on the entire network
May connect multiple smaller networks Determines the most efficient / least congested route for packets to travel |
router
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everything on the internet moves in
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packets
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To break a transmission into smaller, more manageable parts
Allows for more efficient transmission Packets may take different routes to the same destination |
reason for using packets
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Provides communication between application programs and Internet Protocol (IP)
Monitors for lost packets, duplicate packets, packets delivered out of order, etc. Sometimes referred to as TCP/IP |
transmission control protocol
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ways networks are evolving
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Voice over IP
Skype Video over IP Netflix streaming video Beginning to think differently about what a network is… No longer just computers connected to a network but...devices connected to a network Your car Your refrigerator Your Nike shoes Wembley Stadium mousetraps! Networks becoming more ubiquitous WiMAX Worldwide Interoperability for Microwave Access Broadband speed without cables |
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The IP address of the sender & receiver (ex. 192.0.2.235)
IPv4 (ran out of addresses) 32 bit addresses 232 or 4,294,967,296 possible addresses Newer IPv6 128 bit addresses 2128 or ~ 3.4×1038 possible addresses How many packets the message has been broken into The number of a particular packet Where the packet goes…your email client, your Web browser, etc. 2 digit port number |
parts of the packet
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phases of decision making
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intelligence, design, choice, implementation
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A specific type of information system that supports decision-making activities when the problem is not strucutred
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decision support system
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how do packets travel through the network?
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dynamic route not static route
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DSS consists of
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Model management, data management, and user face management
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The “engine” of the system
What-if models, Optimization models, Goal-seeking models, Statistical models |
model management component
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Organizational data, external environment data, etc.
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data management
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how you ask question
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user interface management
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road map is
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dynamic routing
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a decision support system designed specifically to analyze spatial information. any info that can be shown in map form.
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Geographic information system
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