computing

How does cache memory improve performance

Faster access time than main memory

Slows frequently used instructions/data

How does increasing mantissa bits affect representation

Increases accuracy

What is breakpoint

Stops execution at specific line to inspect variables

What is watchpoint

Stops execution when a variable changes to inspect variables

Random number between 1-10

Number = [random.ranint(1,10

How does increasing exponent bits affect representation

Increases range

Benefit of comprehensive test plan

All functional requirements are tested

Rewrite the following

if N % divisor== 0 :

Rewrite highlighted

isPrime = checkPrime(inputNum)

Answer the following

All recipe =[recipe() for x in range(750)]

Why is condition loop efficient

Exits array when value is found

What is an actual parameter

A parameter which is in the main program

What is a formal parameter

A parameter in the subprogram

Steps of fetch execute cycle

1. Address bus is set up with address

2. The processor activates the read line on the control bus

3. Data buss brings instruction from memory to register

4. It is then decoded and executed

How does identifying data flow assist programmer

Identifies parameters

Ways computer misuse can be breached

Unauthorised access

Intent to commit further offence

Unauthorised modification

Code for array of records

Class name

Def__init__(self):

Self.variable=“”

Design for array of records

RECORD array {

Variable AS TYPE STRING

variable AS TYPE REAL

variable AS TYPE BOOLEAN

Bandwidth consumption denial of service attack

Using all of websites available bandwidth

Resource starvation denial of service attack

An attempt to use enough server resources that the system becomes unresponsive

DNS denial of service attack

Modification of DNS record settings to point to a rogue DNS server

What is a Denial of service attack?

When someone tries to prevent legitimate users from accessing an online service via excessive network messages.

Types of test data

Normal, extreme and exceptional

Difference between extreme and exceptional

Exceptional is not within the range

What does increasing the cores on a processor do

Increases the number of instructions the processor can process at the same time

Why is a single processor running at twice the speed faster than a dual core processor

Not always able to share tasks equally between cores

What is a multi core processor

A processor that has multiple CPU’s on one chip

What does increasing the data bus width do

Increases the amount of data/info the bus can transfer at one time

What is cache memory

Small fast accessible memory usually on same chip as processor

What is clock rate

The frequency the clock generates pulses

How do intelligent transport systems improve traffic

Navigation systems avoid traffic

Use of cameras and sensors to move more

Car environmental impact

Start stop systems shut down cars engine when it’s not moving

Heating systems

Using sensors turn of heating when no one is home

Sensors can adjust heating if there is unusual activity

Compatibility testing is

Testing that website works on different browsers and devices

Symptoms of denial is service attacks

Slow performance

Inability to access data

Costs of Denial of service attacks

Lost revenue

Labour in fixing fault

Digital signature

created When message is sent with private key

Verifies sender and verifies message hasn’t been altered

Digital certificate

Authenticates a person, allowing the to exchange data over the internet over the internet using a public key

How is modular programming efficient and maintainable

Efficient: functions can be reused

Maintainable: Modules can be tested individually

Syntax error

Missing/wrong character or letter

Logic error

Error in logic of code, program can still execute but produces Unexpected results

execution error

Program is asked to do something it cannot do

Dry run

Programmer reads code and follows variable to check it is used/updated as expected

Bit mapped vs vector

Bitmapped resolution is set at creation and cannot be changed

Vector is resolution independent and can make use of highest resolution

Bitmapped is suited for photorealism and vector is not

vector more suitable

Object can be edited independently and can be layered