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18 Cards in this Set
- Front
- Back
contains the logical structure for the information in a database
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o Data Dictionary
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is a field that uniquely describes each record
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o Primary Key-
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is a primary key of one file that appears in another file
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o Foreign Key-
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helps you specify the logical organization for a database and access and use the information within a database
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o Database management system
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what are the key parts of the database management system
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o DBMS engine
o Data Definition subsystem o Data manipulation subsystem o Application generation subsystem o Data administration subsystem |
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o Two or more computers connected together so they can communicate with each other to…
o –Share data and information o –Share software o –Share hardware (peripheral devices) o –Share computing power |
a network?
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Only those authorized to access data can access it
o –Someone capturing data as it is transmitted (remember sniffing!) o –Easily guessed passwords! |
o Confidentiality
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Knowing that information comes from the source it claims to come from
o –Spoofing o –Email |
o Authenticity
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Knowing that information has not been altered
o –Hacking o –Network transmission errors |
o Integrity –
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Network services and resources are available when they are supposed to be
o –Denial of service attacks o –Network errors or overload |
o Availability
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What are the key issues in network security?
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confidentiality, authenticity, integrity, availability
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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 |
Wide Area Network (WAN)
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•Covers a distance such as a city or large campus
•May connect multiple LANs together |
Metropolitan Area Network (MAN)
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o •Least intelligent, least expensive
o •Forwards every packet it receives to every other computer o •Easy way to connect computers in a small network |
hub
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o •Like a hub but more intelligent
o •Reads the packet header and forwards it to the correct computer o •More efficient especially in networks with lots of traffic |
switch
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o •Manages traffic on the entire network
o •May connect multiple smaller networks o •Determines the most efficient / least congested route for packets to travel |
Router
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o •Connects two networks together
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Bridge
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