Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Computer Science > Data Transmission > Flashcards

Data Transmission Flashcards

You may prefer our related Brainscape-certified flashcards:
Biology 101 flashcards
1
Q

describe the structure of a packet and what are they

A
  • Packet header:
    • destination IP address
    • packet number
    • sender’s address
  • payload - actual data being transmitted
  • trailer - marks end of packet
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Describe the process of packet switching

A
  1. Data broken down into packets
  2. Each path given a sequence number and sent on its way
  3. Each packet takes a different route depending on quickest + cheapest route at the time
  4. Routers control packet’s route
  5. Packets may arrive out of order –> Once last packet arrives : sequence number used to put in correct order –> data reconstructed correctly
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what is packet switching

A

controls the sending and receiving of packets across a network or the Internet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is simplex transmission

A
  • Data bits sent one at a time down one cable
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is parallel transmission

A

several bits sent simultaneously in both directions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is the disadvantage with serial transmission

A

lower transmission speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is the advantage with serial transmission

A
  • lower interference
  • more reliable over longer distances
  • smaller, simpler, cheaper connections to produce
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is the disadvantage with parallel transmission

A
  • interference issues between wires
  • data corruption can occur over long distances
  • data bits travelling parallel to each other can move at different speeds causing then to arrive out of sync = skewing
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what is the advantage with parallel transmission

A
  • very fast data transfer
  • can send data in both directions at the same time
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what is serial transmission used with

A

USB (Universal Serial Bus) interface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

give the advantages of using an USB

A
  • Do not suffer from skew and crosstalk - unlike parallel
  • is compatible to lots of difference devices - universal industrial standard
  • Easy to set up - cant be inserted the wrong way round - convenient, robust
  • Devices are automatically detected and drivers are automatically loaded for communication
  • supports several transmission rates
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what type of transmission in used in a USB

A

serial

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

name 3 drawbacks of the USB

A
  • Can be no longer than 5 m
  • Small + Easy to loose
  • Cannot be used in motherboard can only use parallels because not fast enough
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is a USB and how is it used to transmit data

A

USB stands for Universal Serial Bus and this is a predominately a serial wire which transmits data on bit at a time from one device to another.
- It is easy, fast and compatible to mostly all devices as it is the universal standard.
- It does not suffer from crosstalk or skew so it is relatively fast to transmit data.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is skew

A
  • Each wire in a parallel cable has slightly different properties
  • Signals arrive a slightly different times
  • The receiver must wait until all lines are received until the next set of bits may be sent
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

when does crosstalk occur

A
  • Crosstalk may occur when a signal on one line creates a disturbance in another line
  • This may cause a bit to be reversed in a parallel line
  • The longer a cable is the more chance of interference
  • Bits in adjacent + neighbouring wire in parallel transmission flips from 0 to 1 or 1 to 0 due a disturbance
16
Q

how to reduce skew

A

Transmission needs to be over very short distances

17
Q

simplex transmission =

A

data travels in one direction only down a single cable

18
Q

Half - duplex transmission

A

data can travel in both directions along a single cable, but not simultaneously

19
Q

Full -duplex transmission =

A

data can travel in both directions simultaneously using 2 communication channels

20
Q

where is simplex transmission used

A

sending data from a computer to a monitor

21
Q

where is half-duplex transmission used

A

a printer cable which waits for the data to be received before sending back a ‘low ink’ message

22
Q

where is full-duplex transmission used

A
  • Networking for Internet cables can send and receive data at the same time
23
Q

what are the advantages of simplex transmission

A
  • Cheap as only one wire is used
  • It has no traffic issues.
24
Q

what are the advantages of half-duplex transmission

A
  • Cheaper than simplex for bidirectional transmission (fewer wires)
  • relatively fast
25
Q

what are the advantages of full-duplex transmission

A
  • Fast as data can travel in both directions simultaneously
26
Q

what are the disadvantages of simplex transmission

A
  • slow
  • no way to verify if the transmitted data has been received correctly.
27
Q

what are the disadvantages of half-duplex transmission

A
  • slow - have to wait
28
Q

what are the disadvantages of full-duplex transmission

A
  • most expensive
  • most suspectable to interference
29
Q

Parallel Simplex =

A

Multiple wires transmit one bit at a time in one direction

30
Q

Parallel Half-duplex =

A

Multiple wires send multiple bits of data in both directions but only one direction at a time

31
Q

Parallel Full-duplex

A

Multiple wires send multiple bits of data in both directions at the same time

Computer Science (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions