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LLC sublayer handles the communication between the upper layers and the lower layers. This is typically between the networking software and the device hardware. MAC is implemented by hardware, typically in the computer NIC, specifics 802.3 standards. 2 primary res. Media access control,Media access control is responsible for the placement of frames on the media
and the removal of frames from the media,Data encapsulation, frame assembly before transmission and frame disassembly upon reception of a
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A decision support database that is maintained separately from
the organization’s operational database
Support information processing by providing a solid platform of
consolidated, historical data for analysis.
“A data warehouse is a subject-oriented, integrated, time-variant,
and nonvolatile collection of data in support of management’s
decision-making process
Subject-Oriented
Organized around major subjects, such as customer,
product, sales
Focusing on the modeling and
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- A possible solution to the proliferation of different
protocols being used on the Internet Origins
- Tim Berners-Lee at CERN proposed the Web
in 1989
Web Browsers
Browsers are clients – always initiate, servers
react (although sometimes servers require
responses)
- Most requests are for existing documents, using
HyperText Transfer Protocol (HTTP)
Web Servers
Provide responses to browser requests, either
existing documents or dynamically built
documents
Uniform Resource Locators
- General form:scheme:object-address
-
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Newer concepts extend direct manipulation
Include
– Collaborative interfaces
– Touchable interfaces
– Virtual reality
– Augmented reality
– Teleportation
Examples of Direct-Manipulation Systems
– Spatial Data Management System
– Video Games
– Computer Aided Design
Principles of Direct Manipulation
1. Continuous representations of objects and
actions of interest with meaningful visual
metaphors.
– Novices learn, masters quick, intermittent users
retain, can see actions further goals
2. Physical
algebra 2
What is the product of 
6×3+29×2+26x-21
What is the product of 
6×3+19×2+12x-5
What is the product of 
6×3+24×2+x18x-12
What are the zeros of the function 
x=-1/2x=-4
What are the zeros of the function 
x=-1/2x=-3
What are the zeros of the function 
x=-1/2x=-2
What are the solutions of the equation |
?½ -⅓
What are the solutions of the equation 
-½ ⅓
What are the solutions of the equation 
-½ -⅓
Which equation shows 
(x+3)