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EDUQAS Computer Science: Component 2 > 2.2 > Flashcards

2.2 Flashcards

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1
Q

Parallel Transmission

A

All bits in a byte are sent simultaneously along seperate lines

  • Faster than serial transmission
  • Requires 8/16 wires
  • Can only be used for short distances
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2
Q

Serial Transmission

A

Data is sent bit by bit along the same data line

  • Can travel longer distances than parallel
  • Requires only 2 wires
  • Slow
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3
Q

Simplex

A
  • Data transmission is possible in one direction only
  • EG sending sound to speakers
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4
Q

Half Duplex

A
  • Data transfer is possible in both directions but only one at a time
  • EG walkie talkies
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5
Q

Full Duplex

A
  • Data transfer is possible in both directions simulatneously
  • EG video conferencing
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6
Q

USB

A
  • A fast interface for connecting peripherals to computers using wired connections
  • Transmit data and provide a power supply for peripheral devices
  • Devices can be linked using USB, chained together through hubs
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7
Q

Bluetooth

A
  • Wireless interface for connecting peripherals to computers
  • Avoids needs for cables
  • Devices would also need own power supply
  • Devices require pairing
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8
Q

Multiplexor

A

Allows for multiple messages to be combined to that they can be sent over a data link simultaneously and then seperated again at the end

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9
Q

Multiplexing on multiuser computer

A

Allows input to the system from different terminats, then routes system output to the correct terminal

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10
Q

Multiplexing on WAN

A

Used to combine messages for transmission over the very high capacity backbone of the network

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11
Q

Time Division Multiplexing

A

Allocates small time slices alternately for data from each of the input message streams

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12
Q

Frequency Division Multiplexing

A

Sends the diffeent messages simultaneously but using different transmission frequencies

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13
Q

Switching

A
  • Used to connect computers in a LAN
  • Switch maintains a table with MAC addresses of devices so it can send data to the required device
  • When a packet is recieved it is examined to determine the destination address and forwarded as appropriate
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14
Q

Router

A
  • Device on a network that holds the addresses of a computer network
  • Used to forward data packets between networks
  • Contol traffic on wide area network
  • Router determines destination of data packets from IP address in the packet protocol then selects approproate route
  • Holds information about current transmission speeds to adjacent nodes so fastest path for transmission can be selected
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15
Q

TCP/IP Packet Switching

A
  • Data is split into packets
  • Each packet has a destination address
  • Packets are analysed by each node
  • Packets are sent down the most appropriate path
  • Each node contains a routing table
  • Packets may take different routes
  • Packets are reassembled at the destination
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16
Q

Contents of a packet

A
  • Source Address: Allow tracing of sender
  • Destination Address: Allows packet to be routed to destination
  • Packet number: Allows packet to be reassembled in the correct order
  • Data Itself
  • Tracking Information: route can be traced
  • Checksum: allows checking of data for errors
17
Q

Network Collsion

A
  • Occurs when two sets of data are transmitted on the network simultaneously
  • Network detects the error
  • Each computer waits a random amount of time before attempting to send packet again
  • Must check if channel is free and wait if not
18
Q

Static Routing

A
  • Paths and devices are programmed manually
  • Simple to implement and for simple topologies
  • More secure
  • Unsuitable for networks which frequently have new devices added to it
  • Required admin
19
Q

Dynamic Routing

A
  • Routers regularly refresh to learn about new devices and pathways
  • Suitable for complex topologies
  • Changes to the network would automatically be identified by the router
  • Changes are not immediate
20
Q

Data Transfer Rates

A
  • How much bandwidth you need depends on what you plan on doing with your internet connection
  • Not measure of speed, just how much data can fit into a transmission medium cable at any one time
21
Q

Bit Rate

A
  • Describes the data requirements of an application over time
  • High bit rate means larger amount of data needs to be sent in a short time
  • Video chats and live broadcasting have high bit rates
  • If you dont have enough bandwidth, you could experience buffering, pixelation and time lag
22
Q

Forwarding Table Columns

A

Destination | Cost | Go To

23
Q

Routing Table Columns

A

Destination | Cost | Route

EDUQAS Computer Science: Component 2 (5 decks)

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