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WorksheetsIGCSE Unit 2 C.S. Review
Total questions: 60
Worksheet time: 20mins
Which methods can be used to transfer data
Copper Cables
Radio Frequency
Optic fibre
Infrared
Gold Cables
What are characteristics of copper cable transmission
Fast
Use electrical pulses
Durable
High corruption rate
Fragile
When is the first copper cable built?
1808
1858
1908
1958
Define bandwidth
The diameter of cables
The amount of data that can be carried at one time
The speed which a signal transfers in
The bands a cable consists of
What does ISP stand for?
International Student Platform
International Signal Provider
Internet Service Provider
Internet Signal Provider
Define serial transmission?
Bits are put into packets an sent over channels
Bits are sent across multiple channels simultaneously
Bits can travel in only one direction
Bits are sent one signal at a time over a single channel
What is not true about serial transmission
It uses synchronous transmission
It is used with the USB
It can be very fast
It can be done over long distances
What does USB stand for?
United States Bachelor
Universal Serial Bus
Uniform State Board
Universal School Bus
What is not true about parallel transmission?
Skew might occur
Can be done over long distances
Uses synchronous transmission
Can be either simplex, duplex, or half duplex
How fast can parallel transmission be, in comparison to serial transmission
0.5 times as fast
1 time as fast
3 times as fast
8 times as fast
What is skew?
Signals travel down wires at different speeds
Wires' signal interfere with each other
Signals are blocked
What is crosstalk?
Parallel lines' data interfere with each other
Same as skew
Data transmission current shortage
What is a computer data ribbon?
Parallel cables used inside the computer to connect components and drives
A ribbon to ensure the computer doesn't fall apart
A decoration found on new computers
Serials cables built into the motherboard
What channels could computer data ribbons use?
8 bit
16 bit
32 bit
64 bit
What does IC stand for?
Internet communication
I'm cool
Integrated circuit
International curtesy
What are ICs made up of?
Semiconductors
Conductors
Insulators
Copper
What are the advantages of serial transmission?
Cheaper
Simpler
Avoid crosstalk
Prevent skew
Up to how long could parallel be used without data corruption?
0.5m
1m
1.5m
2m
Define simplex data transmission.
Data transmission with only one direction
Data transmission with only one channel
Data transmission one direction at a time
Data transmission that could only be used once
Define duplex data transmission.
Data transfers both directions simultaneously
Data can go both directions, not at the same time
Two channels for data transmission
Data transfer only one direction
Define half-duplex data transmission.
Sometimes simplex, sometimes duplex
Sometimes one, sometimes two channels
Data goes both ways with a higher rate of corruption
Data transfer one direction at a time
Define bit rate
Number of bits refreshed per second
Number of bits created per second
Number of bits deleted per second
Number of bits transferred at a given time
What is bit rate measured in?
Bits per second
Bytes per minute
Bits per hour
Bytes per hour
Define baud rate.
Rate at which signal changes
Rate at which signal refreshes
Rate at which the Baudmeter blinks
Bit rate of Baud's computer
What is baseband the same with?
Parallel transmission
Serial transmission
Simplex transmission
Duplex transmission
Half-duplex transmission
What holds true in standard baseband?
Bit rate = baud rate
Bit rate = baud rate ^2
Bit rate = 1/baud rate
Bit rate = 2^baud rate
What does a higher bandwidth imply?
More bits of information can be encoded in one signal
Higher voltage
Less loss of information
Bit rate of channel = ?
Baud rate x # bits per signal
Baud rate/#bits per signal
Baud rate ^ bits per signal
Baud rate^2 * bits per signal
When is synchronous transmission required?
Parallel transmission
Serial transmission
Simplex transmission
Duplex transmission
Half-duplex transmission
When are headers and tails required?
Serial transmission
Parallel transmission
Simplex transmission
Duplex transmission
Half-duplex transmission
USB is only an interface
True
False
What does ARQ stand for?
Automatic Resend Requests
Automatic Resend Query
Automated Resend Requests
Automated Resend Query
Describe an odd parity bit.
Count number of 1s in a byte
If there is an even number of 1s, write 1
One bit per byte
Can detect more than one corruption by itself
Describe an even parity bit.
Count number of 0s in a byte
If there is an even number of 0s, write 0
One bit per byte
Can detect more than one corruption by itself
How to detect more than one corruption per byte?
Odd parity bit
Even parity bit
Odd and even parity bits used together
Parity block
Which of the following uses a check digit?
Book ISBN number
Credit card number
MAC address
Morse code
What does ISBN stand for?
International Standard Book Number
Internet Standard Bandwidth Number
International Standard Bandwidth Number
Internet Standard Blog Number
What does EAN stand for?
European Article Number
Ethernet Article Number
European Advertisement Number
Ethernet Advertisement Number
How many digits does a barcode has? (exclude check digit)
8
10
12
14
How do barcodes work?
Thickness of bar = Number represented
Using morse code
Infrared paint
None of the above
Define a buffer
Temporary memory where CPU "dump" stuff
A soft layer on the inside of the computer
An antivirus software
None of the above
What are checksums used for?
ISBN numbers
Credit card numbers
EAN numbers
None of the above
Define data integrity.
Data is real
Data is not corrupted/copied
Data is not seen before
None of the above
Why are checksums very long?
Be more error proof
Make it harder to hack
To test a computer's ability
None of the above
What are the uses of ARQs
Resend data due to corruption
Acknowledgement of data received
Resend data due to time-out
To alert user of a malware
What is a stop-and-wait ARQ?
Sends data, if no acknowledgement in given time, resends
Sends data only
Send data and wait forever for response
None of the above
Define internet.
A collection of inter-connected networks
A collection of resources
The same as the World Wide Web
None of the above
Define the World Wide WEb.
A collection of inter-connected networks
A collection of resources
The same as the Internet
None of the above
Relationship between the Internet and the World Wide Web
World Wide Web delivers resources over the Internet
The Internet delivers resources over the World Wide We
They have no relation
None of the above
What does WWW stand for
World Wide Web
Wabble-u Wabble-u Wabble-u
World Wide War
None of the above
What does IP stand for?
Internet Protocol
International Protocol
Internal Privacy
Interstellar Parsecs
What is a protocol
A rule
A secret code
A decoding key
A programming language
What does https stand for?
Hyper Text Transfer Protocol Secure
Hyper Text Transfer Privacy Secure
Hot Time Transmission Protocol Suitable
None of the above
What does ISP stand for?
Internet Service Provider
International Signal Provider
Internet Signal Provider
Internet Signal Producer
What is an ISP?
A company supplying connectivity to the Internet
A factory providing electricity
None of the above
What does VOIP stand for?
Voice Over Internet Protocol
Very Obsolete Internet Protocol
Voice Over International Protocol
Voice Over International Proxy
What does URL stand for?
Universal Resource Locator
United Resource Locator
Universal Resource Location
United Resource Location
What does DNS stand for?
Domain Name System
Deductive Numbering Style
Domain Numbering System
Deductive Name System
Characteristics of a modem
Connects you to the ISP
Has telephone number
Obsolete
Relatively easy to use
Characteristics of a router
Provides access to a local area network
ISDN line
Obsolete
Relatively easy to use
