CS Test

Question 1

Why might a programmer prefer to use hexadecimal to access the contents of location?

Answer 1

1) Easier to identify values
2) Easier to spot errors

Question 2

What is a memory dump?

Answer 2

When the memory contents are output to a printer of monitor, this is known as a memory dump.

Question 3

What do numbers in memory dump refer to?

Answer 3

to the memory location of the error (usually automatically generated by the computer.

Question 4

What does MAC Address stand for

Answer 4

Media Access Control

Question 5

Mac adresses are made up of ___?

Answer 5

48 bits (6 groups of hexadecimal digits)

Question 6

1st half of MAC Address identifies ___?

Answer 6

the manufacturer

Question 7

2nd half of MAC Address identifies ___?

Answer 7

serial number of the hardware

Question 8

what are the 2 types of MAC Addresses?

Answer 8

UAA (universally administered mac address) + LAA (locally administered mac address

Question 9

UAA is ___?

Answer 9

By far the most common type of MAC Address

Question 10

UAA is set by?

Answer 10

the manufacturer

Question 11

MAC address sometimes need to be changed using
___?

Why do mac addresses sometimes need to be changed using LAA?

Answer 11

LAA

• on mainframe systems all MAC addresses of devices might need to fall into strict format
• to bypass a MAC address filter on a router network or firewall
• to get past some network restrictions

Question 12

What does IP stand for?

Answer 12

Internet Protocol (address)

Question 13

What is an IP Address?

Answer 13

an address given to every device connected to a network

Question 14

What is an IPv4?

Answer 14

a 32-bit number written in denary or hex form

Question 15

IPv4 has been improved by the adoption ___?

Answer 15

IPv6

Question 16

What is an IPv6?

Answer 16

a 128 bit number broken down into 16-bit chunks represented by a hex number

Question 17

What does IPv6 use instead of a decimal point?

Answer 17

A colon (:)

Question 18

Each color is made up of a combination of shades ___?

Answer 18

red, green, blue

Question 19

in HTML color code…what do the numbers represent?

Answer 19

1st 2 hex digits = red

next 2 digits = green

last two = blue

Question 20

What does ASCII stand for?

Answer 20

American Standard Code for Information Interchange

Question 21

ASCII uses how many bits to represent each character?

Answer 21

7 bits (it can achieve 27 = 128 different representations)

Question 22

What are some disadvantages of ASCII code?

Answer 22

MAIN: it does not represent character in non-western languages, for example Chinese characters

Question 23

Unicode was made to__?

Answer 23

represent all languages of the world, unlike ASCII

Question 24

ASCII uses ___? Unicode uses ___?

Answer 24

ASCII uses 1 byte to represent a character, but unicode uses 4 bytes per character

Question 25

In ASCII character encoding scheme....lower case is...?

Answer 25

lower case is always 32 higher than the upper case

Question 26

ASCII is based on...

Answer 26

the english alphabet

Question 27

Unicode consortium was set up when and why?

Answer 27

In 1991 to create a more universal standard that covered all languages + writing systems. Also to adopt a more efficient coding system than ASCII.

Question 28

File size of an image is calculated as:

Answer 28

image resolution (in pixels) x colour depth (in bits)

Question 29

Size of a mono sound file is calculated as:

Answer 29

sample rate (in Hz) x sample resolution (in bits) x length of sample (in seconds)