Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
84 Cards in this Set
- Front
- Back
An address book in email is used for what purpose?
|
Used to store people's emails
|
|
Advantage of Teleconferencing
|
It reduces costs by simulating face-to-face meetings.
|
|
Asynchronous transmission is...
|
sending data by identifying each byte with a special start & stop bit
|
|
Audio conferencing or Teleconferencing is what?
|
A single phone call involving 3 or more people at different locations.
|
|
Describe Bandwidth
|
The Bandwidth is the capacity of the channel, or transmission medium.
|
|
The Baud Rate is....
|
The maximum number of data symbols or electrical signals that can be transmitted in one second
|
|
Bits per Second (bps) is....
|
The maximum number of bits that can be transmitted in one second.
|
|
bits per second in relation to a communication setting is....
|
The speed of transmission
|
|
What is a Blind carbon copy (Bcc)
|
A copy of an email that is sent to other people, but they can't see who else got it (optional)
|
|
Bus topology
|
all the devices are attached to a direct line called the bus. Nodes listen if the network is clear. If so, a node will transmit. If collision occurs, CSMA/CD Carrier Sense Multiple Access and Collision Detection allows node to re-transmit at later time.
|
|
Carbon copy (Cc) (email header components)
|
send message to other people apart from the recipient (optional)
|
|
Checksum
|
An error checking method that counts the bits in a data packet. Data is divided into packets the bits in each packet are counted and sent to the receiver if the number match it is assumed their is no errors
|
|
Communication settings
|
parameter settings that may be altered to allow computer or peripherals to communicate
|
|
Communication system
|
An information system that enables people to send and retrieve data
|
|
Cyclic Redundancy Check (CRC)
|
binary numbers are divided by a number. The remainder of the division is retained & sent. Receiving computer re-does the calculation. If both agree, it is OK to send. Detects 99.99% of all errors.
|
|
Domain name (email address)
|
The specific computer or server where the person's emails are stored
|
|
EFTPOS (electronic founds transfer at point-of-sales)
|
is a system that allows people to purchase good and services. It electronically transfers money from the costumer to the sellers bank
|
|
Electronic Commerce (e-commerce)
|
is buying or selling goods through the internet. It is a type of communication system
|
|
Electronic banking
|
allows people to view the bank accounts and transfer money between accounts online
|
|
Electronic mail (email)
|
is the sending of mail electronically. It was revolutionised by the invention of the internet. Can be sent around the world in minutes and to anyone who has an email address.
|
|
Email Address
|
The address of the person who is receiving or sending emails. They are unique and comprise of two parts. The name/username of the person and domain name (location on the Internet). They are separated by the @ symbol.
|
|
Email message (structure)
|
an email has two main parts. The header and the body. The header is like an envelope and the sender address is automatically added
|
|
Error Checking
|
When data arrives at its destination it may contain errors. These error must be detected and corrected
|
|
error correction
|
the most common form of error correction is to retransmit the data.
|
|
Half-Duplex Data Flow
|
the data flows both ways but only one way at a time e.g. walkie-talkies
|
|
Full-Duplex Data Flow
|
The data flows both ways, both at the same time e.g. telephone
|
|
Handshaking
|
An agreement on which protocol to use to accomplish the exchange of information.
|
|
intelligent terminal/workstations
|
a terminal that has both memory and processing capabilities most are called workstations on a network
|
|
Issues with Electronic Banking
|
loss of jobs, security of data, changing nature of work
|
|
List issues with email
|
spam and anti-spam legislation, changing nature of workspread of virusesuse of email in court cases
|
|
Local Area Network (LANs)
|
a network the connects computers within a small geographical areae.g. a building
|
|
Mailing List (email)
|
mailing list is a group of people who may want to receive the same message. e.g. a class at school
|
|
Messaging system
|
used to send messages to people in different locations who may receive the message at later time.
|
|
Name the 2 ways of data transmission
|
parallel transmission & serial transmission
|
|
Network
|
a number of computers and their peripheral device connected together in some way
|
|
Network Topology
|
the physical arrangement of devices in a network
|
|
Node
|
each device in a network
|
|
Parallel transmission
|
transferring data at the same time using separate channel. it is faster but get out of sync easily
|
|
Parity Checking
|
Is a method of error checking using an extra bit called a parity bit. It can be odd = odd number of 1's sent, or It can be even = even number of 1's sent.
|
|
Protocol
|
A set of rules that governs the transfer of data between computers
|
|
Reply (email)
|
automatically enters return email address and in the subject types Re: whatever subject the original sender named it
|
|
Ring Topology
|
All devices are attached so that the path is the shape of a continuous circle. Each device has a unique address. Data flows in one direction, moving from device to device until it arrives at destination. This avoids data collisions. A node transmits when it receives a token, hence, token ring network
|
|
Serial transmission
|
is transferring data one after another it is slower but less errors. Serial transmission can be asynchronous or synchronous
|
|
Signature (email)
|
several lines that can be automatically inserted at the bottom of an email.
|
|
Simplex Data Flow
|
the data flow is one direction (receives signal only)e.g Television, Radio
|
|
Speed of transmission
|
The speed of data transmission is determined by the transmitting device and the bandwidth.
|
|
Star topology
|
has a central computer with each device connected directly to it. The central computer acts like a switch and if it goes down, the whole network goes down.
|
|
Stop/Start bits (communication setting)
|
The number of stop start bit used in asynchronous transmission.The parameter is used to identify each bit
|
|
Subject
|
topic of the email or brief description (optional)
|
|
Synchronous
|
all data is sent at the same time and the same number of bytes is sent each second. It is faster and more efficient
|
|
Teleconferencing
|
the use electronic transmission to allow a meeting to occur at the same time at different place
|
|
Terminal
|
a device that send and receives data from anther computer system
|
|
To (email header components)
|
the address of the person receiving the mail
|
|
Traditional ways of messaging systems
|
mail telephone answering machinesfax- sends graphic over telephone line computer may have modern faxesAll of these are still used today
|
|
Video conferencing (Teleconferencing)
|
Allow people at different locations to see video and audio images of each other.
|
|
Wide area network (WANs)
|
a network that cover thousand of kilometers can use normal phone lines or leased data line
|
|
5 components of a communication system
|
SourceTransmitterTransmission MediumReceiverDestination
|
|
What does FROM do?
|
FROM - selects the table you which to extract data from
|
|
What does SELECT do?
|
SELECT - takes the data from the nominated table
|
|
What does WHERE do?
|
WHERE - allows the user to specify what they want to search for (the search criteria)
|
|
Describe what a Flat-file Databse is?
|
All of the data is recorded in one table or file. Suitable for small databases. Can only manage one database at a time
|
|
Describe what a Relational Database is.
|
A set of tables in a database that are linked to each other. Allows you to manage and use several separate databases. Called relational because it's a type of database that allows you build relationships between different tables and databases.
|
|
What is a Primary Key?
|
It is a field that is used to uniquely identify a record in a table or relational database. The data is not replicated anywhere else in the database and it cannot be a null value (blank).
|
|
What is a Foreign Key?
|
A primary key in one table, but a secondary key field in another table. It's used to establish a relationship between two or more tables. They cannot exist in a flat file database and only found in relational databases.
|
|
A Schema or Schematic Diagram is.....
|
An organised plan of the entire database that shows the tables, the fileds of the tables, and the relationships between them.
|
|
What is the difference between Entities and Attributes in a schema?
|
Entities are the Tables in a database. Attributes are the Fields in the tables.
|
|
A relationship occurs when each record in the first entity (table) is related to exactly one record in the second entity (table)
|
One-to-one
|
|
A relationship occurs when one record in the first entity (table) is related to many records in the second entity (table), but any record in the second entity (table) only relates to one record in the first entity (table).
|
One-to-many
|
|
A relationship occurs when each record in the first entity (table) is related to many records in the second entity (table), and each record in the second entity (table) is related to many records in the first entity (table).
|
Many-to-many
|
|
A type of access method used when accessing a storage medium such as magnetic tape.
|
Sequential Access
|
|
A type of access method used when accessing a storage medium such as magnetic disk, CD's or flash drives
|
Direct Access
|
|
A database that is located, stored, and maintained in a single location.
|
Centralised Database
|
|
A database located at more than one site that acts as a single collection of data, but is geographically dispersed.
|
Distributed Database
|
|
There are 6 relational operators used in SQL. What are they?
|
Equal to =Not equal to <>Less than <Greater than >Less than and equal to <=Greater than and equal to >=
|
|
What is Data Mining?
|
It is the process of looking for trends in the data stored in databases. It discovers patternsthat predict future behaviour based on past trends. Patterns may be coincidental or have no real world significance. This is able to occur as a result of improvement in technology.
|
|
Three generations of backup master files
|
Grandfather - Oldest backupFather - Second Oldest bacjupSon - Newest backup
|
|
Disadvantages of paper records
|
Paper deteriorates over timeBulky to storeData cannot be altered or deleted easilyData can only be sorted by one field
|
|
Describe Batch Transaction Processing
|
Collects data in a group and processes at a later time.
|
|
Describe Real Time Processing
|
As data is collected, it is processed immediately, providing instant confirmation.
|
|
Describe what a Decision Support System does
|
Takes data from TPS, MIS and data from external sourcesto make decisions
|
|
Name 5 different information technologies
|
Networked Computers, Keyboards, Monitors, EFTPOS machines, Barcode Scanners, LAN/WAN, Printers, Photocopiers, Camera, Variety of software.
|
|
Name 5 different office automation systems
|
Word Processors, DBMS software, Voice Mail/E-mail, Scheduling Software, Spreadsheets, DTP software
|
|
What are some advantages of computer- based information systems over manual systems?
|
Considerably faster, Data does not have to be in a set order, Data management is much faster, Data can be exchanged easily between applications and over networks, Easily edited and can store large amounts of data.
|
|
What is a DBMS
|
Database Management system
|