Quick Tips

My tips

Hexadecimal

✳✱*

Base 16 number system

0-9 then A-F for a numbers up to 15

1's column to the right, then 16's 256's.....

Servers

Binary to hex is easy, split into two nibbles then convert to denary, then hex

Powerful computers used to deliver services to a client - to serve the needs of the client

ALU

Cache

Arithmetic logic unit

Where the mathematical calculations and logical operations take place

The result of these calculations are stored in the next part of the CPU......

Parts of the CPU

Faster than RAM

Used to hold frequently, or about to be used data

Means the data is ready to be used by the CPU when needed without delay

On 10 mark questions - if in doubt, leave it out

If you run out of space, use the official additional space

Write your details clearly on the front

READ the questions carefully and pick out the key words

Print, Application, File, Mail, Web, Database, Hypervisor...

Can be Physical but can also be virtualised

Registers

Small but very fast memory present on the CPU

Stores a single value but almost immediate access to data

"Processes the instructions required to run the software"

Control Unit

- Controls the way data moves around the cpu

- Controls access to other hardware devices within the computer

- Executes instructions

Virtual storage

SAN (storage area network) is at block level - the storage device appears to be attached to the server

Virtualisation

Virtual Storage

Creating a virtual resource of something physical using software

i.e. one physical server box that runs a virtual print, file and mail server

3 logical servers but only one physical machine!

NAS - network attached storage - file level

A storage device that appears as a storage server to the clients

Business Software

Explain - give an account of the purposes or reasons

Software that supports a business activity

CAD/CAM to help with design and manufacture

MIS/CRM

Identify - recognise or list

Client Server

Development Tools

Peer-to-peer

Compare - Similarities and differences

Contrast - Differences

A network environment where there is an element of centralisation - Access to the network is controlled by the server

Software tools that are used to help people create new software - developers!

Can be used to:

Create

Enhance

Debug or maintain programs

No centralised server

Clients act as both a client and server

Files will be spread out over machines

Cheap

Difficult to manage

Discuss - Range of arguments and viewpoints

Quick Tips

State - express in precise terms

Protocols

Helps with backups and updates

Costs more money to implement

UDP - User datagram protocol: Low latency

SNMP - simple network management protocol: gathers information about and allows configuration of networked devices such as routers

A protocol is a set of rules

We have protocols that ensure computer operations are carried out in the exact same way

Allows devices from different manufacturers to be compatible

TCP/IP

POP

IMAP - Internet Message Access Protocol

SMTP

Other SOP

Sales ordering process

POST - Power On Self Test: Bleep codes when the computer starts up can indicate errors

Troubleshooting Tools

Ping - Used to test connectivity between nodes

SOP

Internally generated document for the organisation

Used to collate all of the details needed to fulfill an order

Event viewer in Windows records down any errors the computer has encountered

Fibre

Standard operating procedure is a step-by-step set of rules to perform a business task

Connectivity methods

Transmits data as a beam of light down a glass/plastic fibre no thicker than a human hair

Uni-directional - minimum two fibres needed

Very fast, not affected by interference and can cover long distances

Expensive!

STP/UTP

Common standard, Cat5e capable of 1gigabit, cat6 capable of 10 gigabit

Coaxial

If everyone follows them, then we get the same result

- Can take a lot of time

- Can lead to lack of innovation

Single central wire transmits data, surrounded by wire mesh to reduce interference

10 megabit speeds