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38 Cards in this Set

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  • Back
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Handshaking

When two devices communicate change of preliminary signals is handshaking

Bus network

Less cabling poor reliability speed will be slow if too many modes

Star network

Better reliability good security easy to add nodes

Ring network

Good reliability


Security issues


Cabling is expensive

TCP IP

Basic communication protocol over the Internet or networks

HTTP

hypertext transfer protocol transferring web pages between client and server

FTP

File transfer protocol transfer info files from one computer to another

SMTP

Simple mail transfer protocol sending emails over the Internet

VoIP

Voice over Internet protocol voiced messages

Wireless

Transmission of data over wireless network

Define file

Organised collection of records

Define records

Organised collection of fields

Define fields

Single data item

What is a master file

Main file for an application large semi permanent

What is a transaction file

Temporary file used to store data which will update the master file

Primary key

Uniquely identify a each record

Fixed length record advantages

Faster to search computer knows where each record starts

Fixed length record disadvantage

More storage space required sower to transfer

Variable length record advantages

Smaller less storage space needed


Records will load faster and save faster


File will be faster to transmit down a network

Disadvantages of a variable length record

Processing will be slower

Define validation

Check if data entered is sensible and with acceptable boundaries

Some validation checks

Range check


Type check


Check digit


Length check


Look up


Presence check

Define verification

Check that the data entered is the same as the one from the source document

Types of verification

Screen typing


Double typing

What is an array

List of data items which are all the same data type

Bunary search

Looks at middle above or below narrows it down

Defragmentation

Moves stuff closer on discs

Spooling

Queue for processing needed for different speeds of peripherals

Feasibility study

Requirement analysis


Technical report


Schedule report


Cost report


Budget report

Change over

Direct changeover


Phases changeover


Parallel running


Piloting

Maintenance

Adaptive


Corrective


Perfective

Documentation

Technical manual


User manual

Internet

Wide area network collection of lots of networks

Intranet

Local area network on base of company

Extranet

From our side base of company access through firewall

Code of conduct

Ensures consistency of practice

Data protection acts

Not to store or process data other than lawful purpose


Process data fairly lawfully


Store only relevant data


Not to infringe rights of data


Make sure data is accurate


Don't keep data longer than necessary


Protect the data


Don't send it outside the EU

8

Individual rights

To view data


Correct data and erase data


Compensate for infringement